---
_id: '47997'
abstract:
- lang: eng
text: The crystal family of potassium titanyl phosphate (KTiOPO4) is a promising
material group for applications in quantum and nonlinear optics. The fabrication
of low-loss optical waveguides, as well as high-grade periodically poled ferroelectric
domain structures, requires a profound understanding of the material properties
and crystal structure. In this regard, Raman spectroscopy offers the possibility
to study and visualize domain structures, strain, defects, and the local stoichiometry,
which are all factors impacting device performance. However, the accurate interpretation
of Raman spectra and their changes with respect to extrinsic and intrinsic defects
requires a thorough assignment of the Raman modes to their respective crystal
features, which to date is only partly conducted based on phenomenological modelling.
To address this issue, we calculated the phonon spectra of potassium titanyl phosphate
and the related compounds rubidium titanyl phosphate (RbTiOPO4) and potassium
titanyl arsenate (KTiOAsO4) based on density functional theory and compared them
with experimental data. Overall, this allows us to assign various spectral features
to eigenmodes of lattice substructures with improved detail compared to previous
assignments. Nevertheless, the analysis also shows that not all features of the
spectra can unambigiously be explained yet. A possible explanation might be that
defects or long range fields not included in the modeling play a crucial rule
for the resulting Raman spectrum. In conclusion, this work provides an improved
foundation into the vibrational properties in the KTiOPO4 material family.
article_number: '1423'
author:
- first_name: Sergej
full_name: Neufeld, Sergej
last_name: Neufeld
- first_name: Uwe
full_name: Gerstmann, Uwe
id: '171'
last_name: Gerstmann
orcid: 0000-0002-4476-223X
- first_name: Laura
full_name: Padberg, Laura
id: '40300'
last_name: Padberg
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
citation:
ama: Neufeld S, Gerstmann U, Padberg L, et al. Vibrational Properties of the Potassium
Titanyl Phosphate Crystal Family. Crystals. 2023;13(10). doi:10.3390/cryst13101423
apa: Neufeld, S., Gerstmann, U., Padberg, L., Eigner, C., Berth, G., Silberhorn,
C., Eng, L. M., Schmidt, W. G., & Rüsing, M. (2023). Vibrational Properties
of the Potassium Titanyl Phosphate Crystal Family. Crystals, 13(10),
Article 1423. https://doi.org/10.3390/cryst13101423
bibtex: '@article{Neufeld_Gerstmann_Padberg_Eigner_Berth_Silberhorn_Eng_Schmidt_Rüsing_2023,
title={Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family},
volume={13}, DOI={10.3390/cryst13101423},
number={101423}, journal={Crystals}, publisher={MDPI AG}, author={Neufeld, Sergej
and Gerstmann, Uwe and Padberg, Laura and Eigner, Christof and Berth, Gerhard
and Silberhorn, Christine and Eng, Lukas M. and Schmidt, Wolf Gero and Rüsing,
Michael}, year={2023} }'
chicago: Neufeld, Sergej, Uwe Gerstmann, Laura Padberg, Christof Eigner, Gerhard
Berth, Christine Silberhorn, Lukas M. Eng, Wolf Gero Schmidt, and Michael Rüsing.
“Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” Crystals
13, no. 10 (2023). https://doi.org/10.3390/cryst13101423.
ieee: 'S. Neufeld et al., “Vibrational Properties of the Potassium Titanyl
Phosphate Crystal Family,” Crystals, vol. 13, no. 10, Art. no. 1423, 2023,
doi: 10.3390/cryst13101423.'
mla: Neufeld, Sergej, et al. “Vibrational Properties of the Potassium Titanyl Phosphate
Crystal Family.” Crystals, vol. 13, no. 10, 1423, MDPI AG, 2023, doi:10.3390/cryst13101423.
short: S. Neufeld, U. Gerstmann, L. Padberg, C. Eigner, G. Berth, C. Silberhorn,
L.M. Eng, W.G. Schmidt, M. Rüsing, Crystals 13 (2023).
date_created: 2023-10-11T09:10:53Z
date_updated: 2023-10-11T09:15:58Z
department:
- _id: '169'
doi: 10.3390/cryst13101423
funded_apc: '1'
intvolume: ' 13'
issue: '10'
keyword:
- Inorganic Chemistry
- Condensed Matter Physics
- General Materials Science
- General Chemical Engineering
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3390/cryst13101423
oa: '1'
project:
- _id: '168'
grant_number: '231447078'
name: 'TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften
von Lithiumniobat (B07*)'
- _id: '55'
name: 'TRR 142 - B: TRR 142 - Project Area B'
- _id: '266'
grant_number: PROFILNRW-2020-067
name: 'PhoQC: PhoQC: Photonisches Quantencomputing'
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family
type: journal_article
user_id: '22501'
volume: 13
year: '2023'
...
---
_id: '54852'
abstract:
- lang: eng
text: The crystal family of potassium titanyl phosphate (KTiOPO4) is a promising
material group for applications in quantum and nonlinear optics. The fabrication
of low-loss optical waveguides, as well as high-grade periodically poled ferroelectric
domain structures, requires a profound understanding of the material properties
and crystal structure. In this regard, Raman spectroscopy offers the possibility
to study and visualize domain structures, strain, defects, and the local stoichiometry,
which are all factors impacting device performance. However, the accurate interpretation
of Raman spectra and their changes with respect to extrinsic and intrinsic defects
requires a thorough assignment of the Raman modes to their respective crystal
features, which to date is only partly conducted based on phenomenological modelling.
To address this issue, we calculated the phonon spectra of potassium titanyl phosphate
and the related compounds rubidium titanyl phosphate (RbTiOPO4) and potassium
titanyl arsenate (KTiOAsO4) based on density functional theory and compared them
with experimental data. Overall, this allows us to assign various spectral features
to eigenmodes of lattice substructures with improved detail compared to previous
assignments. Nevertheless, the analysis also shows that not all features of the
spectra can unambigiously be explained yet. A possible explanation might be that
defects or long range fields not included in the modeling play a crucial rule
for the resulting Raman spectrum. In conclusion, this work provides an improved
foundation into the vibrational properties in the KTiOPO4 material family.
article_number: '1423'
author:
- first_name: Sergej
full_name: Neufeld, Sergej
last_name: Neufeld
- first_name: Uwe
full_name: Gerstmann, Uwe
id: '171'
last_name: Gerstmann
orcid: 0000-0002-4476-223X
- first_name: Laura
full_name: Padberg, Laura
id: '40300'
last_name: Padberg
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
citation:
ama: Neufeld S, Gerstmann U, Padberg L, et al. Vibrational Properties of the Potassium
Titanyl Phosphate Crystal Family. Crystals. 2023;13(10). doi:10.3390/cryst13101423
apa: Neufeld, S., Gerstmann, U., Padberg, L., Eigner, C., Berth, G., Silberhorn,
C., Eng, L. M., Schmidt, W. G., & Rüsing, M. (2023). Vibrational Properties
of the Potassium Titanyl Phosphate Crystal Family. Crystals, 13(10),
Article 1423. https://doi.org/10.3390/cryst13101423
bibtex: '@article{Neufeld_Gerstmann_Padberg_Eigner_Berth_Silberhorn_Eng_Schmidt_Rüsing_2023,
title={Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family},
volume={13}, DOI={10.3390/cryst13101423},
number={101423}, journal={Crystals}, publisher={MDPI AG}, author={Neufeld, Sergej
and Gerstmann, Uwe and Padberg, Laura and Eigner, Christof and Berth, Gerhard
and Silberhorn, Christine and Eng, Lukas M. and Schmidt, Wolf Gero and Rüsing,
Michael}, year={2023} }'
chicago: Neufeld, Sergej, Uwe Gerstmann, Laura Padberg, Christof Eigner, Gerhard
Berth, Christine Silberhorn, Lukas M. Eng, Wolf Gero Schmidt, and Michael Rüsing.
“Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” Crystals
13, no. 10 (2023). https://doi.org/10.3390/cryst13101423.
ieee: 'S. Neufeld et al., “Vibrational Properties of the Potassium Titanyl
Phosphate Crystal Family,” Crystals, vol. 13, no. 10, Art. no. 1423, 2023,
doi: 10.3390/cryst13101423.'
mla: Neufeld, Sergej, et al. “Vibrational Properties of the Potassium Titanyl Phosphate
Crystal Family.” Crystals, vol. 13, no. 10, 1423, MDPI AG, 2023, doi:10.3390/cryst13101423.
short: S. Neufeld, U. Gerstmann, L. Padberg, C. Eigner, G. Berth, C. Silberhorn,
L.M. Eng, W.G. Schmidt, M. Rüsing, Crystals 13 (2023).
date_created: 2024-06-24T06:15:00Z
date_updated: 2024-06-24T06:30:23Z
department:
- _id: '15'
- _id: '170'
- _id: '295'
- _id: '288'
- _id: '230'
- _id: '429'
doi: 10.3390/cryst13101423
intvolume: ' 13'
issue: '10'
language:
- iso: eng
project:
- _id: '53'
grant_number: '231447078'
name: 'TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden
Konzepten zu funktionellen Strukturen'
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
status: public
title: Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family
type: journal_article
user_id: '16199'
volume: 13
year: '2023'
...
---
_id: '23826'
abstract:
- lang: eng
text: Potassium titanyl phosphate (KTP) is a nonlinear optical material
with applications in high-power frequency conversion or quasi-phase matching in
submicron period domain grids. A prerequisite for these applications is a precise
control and understanding of the poling mechanisms to enable the fabrication of
high-grade domain grids. In contrast to the widely used material lithium niobate,
the domain growth in KTP is less studied, because many standard methods, such
as selective etching or polarization microscopy, provides less insight or are
not applicable on non-polar surfaces, respectively. In this work, we present results
of confocal Raman-spectroscopy of the ferroelectric domain structure in KTP. This
analytical method allows for the visualization of domain grids of the non-polar
KTP y-face and therefore more insight into the domain-growth and -structure in
KTP, which can be used for improved domain fabrication.
article_number: '1086'
author:
- first_name: Julian
full_name: Brockmeier, Julian
id: '44807'
last_name: Brockmeier
- first_name: Peter Walter Martin
full_name: Mackwitz, Peter Walter Martin
last_name: Mackwitz
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Laura
full_name: Padberg, Laura
id: '40300'
last_name: Padberg
- first_name: Matteo
full_name: Santandrea, Matteo
id: '55095'
last_name: Santandrea
orcid: 0000-0001-5718-358X
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
citation:
ama: Brockmeier J, Mackwitz PWM, Rüsing M, et al. Non-Invasive Visualization of
Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman
Imaging. Crystals. Published online 2021. doi:10.3390/cryst11091086
apa: Brockmeier, J., Mackwitz, P. W. M., Rüsing, M., Eigner, C., Padberg, L., Santandrea,
M., Silberhorn, C., Zrenner, A., & Berth, G. (2021). Non-Invasive Visualization
of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman
Imaging. Crystals, Article 1086. https://doi.org/10.3390/cryst11091086
bibtex: '@article{Brockmeier_Mackwitz_Rüsing_Eigner_Padberg_Santandrea_Silberhorn_Zrenner_Berth_2021,
title={Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar
y-Surface of KTiOPO4 via Raman Imaging}, DOI={10.3390/cryst11091086},
number={1086}, journal={Crystals}, author={Brockmeier, Julian and Mackwitz, Peter
Walter Martin and Rüsing, Michael and Eigner, Christof and Padberg, Laura and
Santandrea, Matteo and Silberhorn, Christine and Zrenner, Artur and Berth, Gerhard},
year={2021} }'
chicago: Brockmeier, Julian, Peter Walter Martin Mackwitz, Michael Rüsing, Christof
Eigner, Laura Padberg, Matteo Santandrea, Christine Silberhorn, Artur Zrenner,
and Gerhard Berth. “Non-Invasive Visualization of Ferroelectric Domain Structures
on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging.” Crystals, 2021.
https://doi.org/10.3390/cryst11091086.
ieee: 'J. Brockmeier et al., “Non-Invasive Visualization of Ferroelectric
Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging,” Crystals,
Art. no. 1086, 2021, doi: 10.3390/cryst11091086.'
mla: Brockmeier, Julian, et al. “Non-Invasive Visualization of Ferroelectric Domain
Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging.” Crystals,
1086, 2021, doi:10.3390/cryst11091086.
short: J. Brockmeier, P.W.M. Mackwitz, M. Rüsing, C. Eigner, L. Padberg, M. Santandrea,
C. Silberhorn, A. Zrenner, G. Berth, Crystals (2021).
date_created: 2021-09-07T08:09:36Z
date_updated: 2023-10-06T07:40:37Z
department:
- _id: '15'
- _id: '288'
doi: 10.3390/cryst11091086
language:
- iso: eng
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
status: public
title: Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar
y-Surface of KTiOPO4 via Raman Imaging
type: journal_article
user_id: '13244'
year: '2021'
...
---
_id: '22056'
article_number: '234102'
author:
- first_name: K. J.
full_name: Spychala, K. J.
last_name: Spychala
- first_name: P.
full_name: Mackwitz, P.
last_name: Mackwitz
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: A.
full_name: Widhalm, A.
last_name: Widhalm
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
citation:
ama: 'Spychala KJ, Mackwitz P, Rüsing M, et al. Nonlinear focal mapping of ferroelectric
domain walls in LiNbO3: Analysis of the SHG microscopy contrast mechanism. Journal
of Applied Physics. Published online 2020. doi:10.1063/5.0025284'
apa: 'Spychala, K. J., Mackwitz, P., Rüsing, M., Widhalm, A., Berth, G., Silberhorn,
C., & Zrenner, A. (2020). Nonlinear focal mapping of ferroelectric domain
walls in LiNbO3: Analysis of the SHG microscopy contrast mechanism. Journal
of Applied Physics, Article 234102. https://doi.org/10.1063/5.0025284'
bibtex: '@article{Spychala_Mackwitz_Rüsing_Widhalm_Berth_Silberhorn_Zrenner_2020,
title={Nonlinear focal mapping of ferroelectric domain walls in LiNbO3: Analysis
of the SHG microscopy contrast mechanism}, DOI={10.1063/5.0025284},
number={234102}, journal={Journal of Applied Physics}, author={Spychala, K. J.
and Mackwitz, P. and Rüsing, Michael and Widhalm, A. and Berth, Gerhard and Silberhorn,
Christine and Zrenner, Artur}, year={2020} }'
chicago: 'Spychala, K. J., P. Mackwitz, Michael Rüsing, A. Widhalm, Gerhard Berth,
Christine Silberhorn, and Artur Zrenner. “Nonlinear Focal Mapping of Ferroelectric
Domain Walls in LiNbO3: Analysis of the SHG Microscopy Contrast Mechanism.” Journal
of Applied Physics, 2020. https://doi.org/10.1063/5.0025284.'
ieee: 'K. J. Spychala et al., “Nonlinear focal mapping of ferroelectric domain
walls in LiNbO3: Analysis of the SHG microscopy contrast mechanism,” Journal
of Applied Physics, Art. no. 234102, 2020, doi: 10.1063/5.0025284.'
mla: 'Spychala, K. J., et al. “Nonlinear Focal Mapping of Ferroelectric Domain Walls
in LiNbO3: Analysis of the SHG Microscopy Contrast Mechanism.” Journal of Applied
Physics, 234102, 2020, doi:10.1063/5.0025284.'
short: K.J. Spychala, P. Mackwitz, M. Rüsing, A. Widhalm, G. Berth, C. Silberhorn,
A. Zrenner, Journal of Applied Physics (2020).
date_created: 2021-05-09T06:33:08Z
date_updated: 2023-10-09T08:07:57Z
department:
- _id: '15'
- _id: '230'
doi: 10.1063/5.0025284
language:
- iso: eng
publication: Journal of Applied Physics
publication_identifier:
issn:
- 0021-8979
- 1089-7550
publication_status: published
status: public
title: 'Nonlinear focal mapping of ferroelectric domain walls in LiNbO3: Analysis
of the SHG microscopy contrast mechanism'
type: journal_article
user_id: '14931'
year: '2020'
...
---
_id: '25920'
article_number: '24353'
author:
- first_name: Laura
full_name: Padberg, Laura
id: '40300'
last_name: Padberg
- first_name: Matteo
full_name: Santandrea, Matteo
id: '55095'
last_name: Santandrea
orcid: 0000-0001-5718-358X
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Julian
full_name: Brockmeier, Julian
id: '44807'
last_name: Brockmeier
- first_name: Peter
full_name: Mackwitz, Peter
last_name: Mackwitz
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
citation:
ama: Padberg L, Santandrea M, Rüsing M, et al. Characterisation of width-dependent
diffusion dynamics in rubidium-exchanged KTP waveguides. Optics Express.
Published online 2020. doi:10.1364/oe.397074
apa: Padberg, L., Santandrea, M., Rüsing, M., Brockmeier, J., Mackwitz, P., Berth,
G., Zrenner, A., Eigner, C., & Silberhorn, C. (2020). Characterisation of
width-dependent diffusion dynamics in rubidium-exchanged KTP waveguides. Optics
Express, Article 24353. https://doi.org/10.1364/oe.397074
bibtex: '@article{Padberg_Santandrea_Rüsing_Brockmeier_Mackwitz_Berth_Zrenner_Eigner_Silberhorn_2020,
title={Characterisation of width-dependent diffusion dynamics in rubidium-exchanged
KTP waveguides}, DOI={10.1364/oe.397074},
number={24353}, journal={Optics Express}, author={Padberg, Laura and Santandrea,
Matteo and Rüsing, Michael and Brockmeier, Julian and Mackwitz, Peter and Berth,
Gerhard and Zrenner, Artur and Eigner, Christof and Silberhorn, Christine}, year={2020}
}'
chicago: Padberg, Laura, Matteo Santandrea, Michael Rüsing, Julian Brockmeier, Peter
Mackwitz, Gerhard Berth, Artur Zrenner, Christof Eigner, and Christine Silberhorn.
“Characterisation of Width-Dependent Diffusion Dynamics in Rubidium-Exchanged
KTP Waveguides.” Optics Express, 2020. https://doi.org/10.1364/oe.397074.
ieee: 'L. Padberg et al., “Characterisation of width-dependent diffusion
dynamics in rubidium-exchanged KTP waveguides,” Optics Express, Art. no.
24353, 2020, doi: 10.1364/oe.397074.'
mla: Padberg, Laura, et al. “Characterisation of Width-Dependent Diffusion Dynamics
in Rubidium-Exchanged KTP Waveguides.” Optics Express, 24353, 2020, doi:10.1364/oe.397074.
short: L. Padberg, M. Santandrea, M. Rüsing, J. Brockmeier, P. Mackwitz, G. Berth,
A. Zrenner, C. Eigner, C. Silberhorn, Optics Express (2020).
date_created: 2021-10-08T11:12:36Z
date_updated: 2023-10-09T08:27:41Z
department:
- _id: '15'
- _id: '288'
doi: 10.1364/oe.397074
language:
- iso: eng
project:
- _id: '55'
name: TRR 142 - Project Area B
publication: Optics Express
publication_identifier:
issn:
- 1094-4087
publication_status: published
status: public
title: Characterisation of width-dependent diffusion dynamics in rubidium-exchanged
KTP waveguides
type: journal_article
user_id: '14931'
year: '2020'
...
---
_id: '4769'
abstract:
- lang: eng
text: "In recent years, Raman spectroscopy has been used to visualize and analyze
ferroelectric domain structures.\r\nThe technique makes use of the fact that the
intensity or frequency of certain phonons is strongly influenced\r\nby the presence
of domain walls. Although the method is used frequently, the underlying mechanism
responsible\r\nfor the changes in the spectra is not fully understood. This inhibits
deeper analysis of domain structures based\r\non this method. Two different models
have been proposed. However, neither model completely explains all\r\nobservations.
In this work, we have systematically investigated domain walls in different scattering
geometries\r\nwith Raman spectroscopy in the common ferroelectric materials used
in integrated optics, i.e., KTiOPO4,\r\nLiNbO3, and LiTaO3. Based on the two models,
we can demonstrate that the observed contrast for domain\r\nwalls is in fact based
on two different effects. We can identify on the one hand microscopic changes
at the\r\ndomain wall, e.g., strain and electric fields, and on the other hand
a macroscopic change of selection rules at the\r\ndomain wall. While the macroscopic
relaxation of selection rules can be explained by the directional dispersion\r\nof
the phonons in agreement with previous propositions, the microscopic changes can
be explained qualitatively\r\nin terms of a simplified atomistic model."
article_type: original
author:
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Sergej
full_name: Neufeld, Sergej
id: '23261'
last_name: Neufeld
- first_name: Julian
full_name: Brockmeier, Julian
id: '44807'
last_name: Brockmeier
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: P.
full_name: Mackwitz, P.
last_name: Mackwitz
- first_name: K.
full_name: Spychala, K.
last_name: Spychala
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
- first_name: S.
full_name: Sanna, S.
last_name: Sanna
citation:
ama: 'Rüsing M, Neufeld S, Brockmeier J, et al. Imaging of 180∘ ferroelectric domain
walls in uniaxial ferroelectrics by confocal Raman spectroscopy: Unraveling the
contrast mechanism. Physical Review Materials. 2018;2(10). doi:10.1103/physrevmaterials.2.103801'
apa: 'Rüsing, M., Neufeld, S., Brockmeier, J., Eigner, C., Mackwitz, P., Spychala,
K., Silberhorn, C., Schmidt, W. G., Berth, G., Zrenner, A., & Sanna, S. (2018).
Imaging of 180∘ ferroelectric domain walls in uniaxial ferroelectrics by confocal
Raman spectroscopy: Unraveling the contrast mechanism. Physical Review Materials,
2(10). https://doi.org/10.1103/physrevmaterials.2.103801'
bibtex: '@article{Rüsing_Neufeld_Brockmeier_Eigner_Mackwitz_Spychala_Silberhorn_Schmidt_Berth_Zrenner_et
al._2018, title={Imaging of 180∘ ferroelectric domain walls in uniaxial ferroelectrics
by confocal Raman spectroscopy: Unraveling the contrast mechanism}, volume={2},
DOI={10.1103/physrevmaterials.2.103801},
number={10}, journal={Physical Review Materials}, publisher={American Physical
Society (APS)}, author={Rüsing, Michael and Neufeld, Sergej and Brockmeier, Julian
and Eigner, Christof and Mackwitz, P. and Spychala, K. and Silberhorn, Christine
and Schmidt, Wolf Gero and Berth, Gerhard and Zrenner, Artur and et al.}, year={2018}
}'
chicago: 'Rüsing, Michael, Sergej Neufeld, Julian Brockmeier, Christof Eigner, P.
Mackwitz, K. Spychala, Christine Silberhorn, et al. “Imaging of 180∘ Ferroelectric
Domain Walls in Uniaxial Ferroelectrics by Confocal Raman Spectroscopy: Unraveling
the Contrast Mechanism.” Physical Review Materials 2, no. 10 (2018). https://doi.org/10.1103/physrevmaterials.2.103801.'
ieee: 'M. Rüsing et al., “Imaging of 180∘ ferroelectric domain walls in uniaxial
ferroelectrics by confocal Raman spectroscopy: Unraveling the contrast mechanism,”
Physical Review Materials, vol. 2, no. 10, 2018, doi: 10.1103/physrevmaterials.2.103801.'
mla: 'Rüsing, Michael, et al. “Imaging of 180∘ Ferroelectric Domain Walls in Uniaxial
Ferroelectrics by Confocal Raman Spectroscopy: Unraveling the Contrast Mechanism.”
Physical Review Materials, vol. 2, no. 10, American Physical Society (APS),
2018, doi:10.1103/physrevmaterials.2.103801.'
short: M. Rüsing, S. Neufeld, J. Brockmeier, C. Eigner, P. Mackwitz, K. Spychala,
C. Silberhorn, W.G. Schmidt, G. Berth, A. Zrenner, S. Sanna, Physical Review Materials
2 (2018).
date_created: 2018-10-18T08:50:47Z
date_updated: 2023-10-11T09:01:48Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
- _id: '288'
doi: 10.1103/physrevmaterials.2.103801
intvolume: ' 2'
issue: '10'
language:
- iso: eng
project:
- _id: '53'
grant_number: '231447078'
name: TRR 142
- _id: '55'
name: TRR 142 - Project Area B
- _id: '69'
grant_number: '231447078'
name: TRR 142 - Subproject B4
- _id: '70'
grant_number: '231447078'
name: TRR 142 - Subproject B5
publication: Physical Review Materials
publication_identifier:
issn:
- 2475-9953
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Imaging of 180∘ ferroelectric domain walls in uniaxial ferroelectrics by confocal
Raman spectroscopy: Unraveling the contrast mechanism'
type: journal_article
user_id: '22501'
volume: 2
year: '2018'
...
---
_id: '3434'
abstract:
- lang: eng
text: In this work we study the impact of ion implantation on the nonlinear optical
properties in MgO:LiNbO3 via confocal second-harmonic microscopy. In detail, we
spatially characterize the nonlinear susceptibility in carbon-ion implanted lithium
niobate planar waveguides for different implantation energies and fluences, as
well as the effect of annealing. In a further step, a computational simulation
is used to calculate the implantation range of carbon-ions and the corresponding
defect density distribution. A comparison between the simulation and the experimental
data indicates that the depth profile of the second-order effective nonlinear
coefficient is directly connected to the defect density that is induced by the
ion irradiation. Furthermore it can be demonstrated that the annealing treatment
partially recovers the second-order optical susceptibility.
article_type: original
author:
- first_name: Kai J.
full_name: Spychala, Kai J.
last_name: Spychala
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Alex
full_name: Widhalm, Alex
last_name: Widhalm
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Lei
full_name: Wang, Lei
last_name: Wang
- first_name: Simone
full_name: Sanna, Simone
last_name: Sanna
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
citation:
ama: Spychala KJ, Berth G, Widhalm A, et al. Impact of carbon-ion implantation on
the nonlinear optical susceptibility of LiNbO3. OPTICS EXPRESS. 2017;(18):21444--21453.
doi:10.1364/OE.25.021444
apa: Spychala, K. J., Berth, G., Widhalm, A., Rüsing, M., Wang, L., Sanna, S., &
Zrenner, A. (2017). Impact of carbon-ion implantation on the nonlinear optical
susceptibility of LiNbO3. OPTICS EXPRESS, 18, 21444--21453. https://doi.org/10.1364/OE.25.021444
bibtex: '@article{Spychala_Berth_Widhalm_Rüsing_Wang_Sanna_Zrenner_2017, title={Impact
of carbon-ion implantation on the nonlinear optical susceptibility of LiNbO3},
DOI={10.1364/OE.25.021444},
number={18}, journal={OPTICS EXPRESS}, author={Spychala, Kai J. and Berth, Gerhard
and Widhalm, Alex and Rüsing, Michael and Wang, Lei and Sanna, Simone and Zrenner,
Artur}, year={2017}, pages={21444--21453} }'
chicago: 'Spychala, Kai J., Gerhard Berth, Alex Widhalm, Michael Rüsing, Lei Wang,
Simone Sanna, and Artur Zrenner. “Impact of Carbon-Ion Implantation on the Nonlinear
Optical Susceptibility of LiNbO3.” OPTICS EXPRESS, no. 18 (2017): 21444--21453.
https://doi.org/10.1364/OE.25.021444.'
ieee: 'K. J. Spychala et al., “Impact of carbon-ion implantation on the nonlinear
optical susceptibility of LiNbO3,” OPTICS EXPRESS, no. 18, pp. 21444--21453,
2017, doi: 10.1364/OE.25.021444.'
mla: Spychala, Kai J., et al. “Impact of Carbon-Ion Implantation on the Nonlinear
Optical Susceptibility of LiNbO3.” OPTICS EXPRESS, no. 18, 2017, pp. 21444--21453,
doi:10.1364/OE.25.021444.
short: K.J. Spychala, G. Berth, A. Widhalm, M. Rüsing, L. Wang, S. Sanna, A. Zrenner,
OPTICS EXPRESS (2017) 21444--21453.
date_created: 2018-07-05T11:53:46Z
date_updated: 2023-10-09T08:10:58Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
doi: 10.1364/OE.25.021444
issue: '18'
language:
- iso: eng
page: 21444--21453
project:
- _id: '53'
grant_number: '231447078'
name: TRR 142
- _id: '55'
name: TRR 142 - Project Area B
- _id: '68'
grant_number: '231447078'
name: TRR 142 - Subproject B3
publication: OPTICS EXPRESS
publication_identifier:
issn:
- 1094-4087
publication_status: published
status: public
title: Impact of carbon-ion implantation on the nonlinear optical susceptibility of
LiNbO3
type: journal_article
user_id: '14931'
year: '2017'
...
---
_id: '3798'
author:
- first_name: Thomas
full_name: Hett, Thomas
last_name: Hett
- first_name: Torsten
full_name: Frers, Torsten
last_name: Frers
- first_name: Alex
full_name: Widhalm, Alex
last_name: Widhalm
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Ulrich
full_name: Hilleringmann, Ulrich
last_name: Hilleringmann
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
citation:
ama: 'Hett T, Frers T, Widhalm A, Berth G, Hilleringmann U, Zrenner A. Silicon oxynitride
microdisk resonators for integrated waveguide coupling. In: Smart Systems Integration
2016 - International Conference and Exhibition on Integration Issues of Miniaturized
Systems, SSI 2016. Munich; 2016:400-403.'
apa: Hett, T., Frers, T., Widhalm, A., Berth, G., Hilleringmann, U., & Zrenner,
A. (2016). Silicon oxynitride microdisk resonators for integrated waveguide coupling.
In Smart Systems Integration 2016 - International Conference and Exhibition
on Integration Issues of Miniaturized Systems, SSI 2016 (pp. 400–403). Munich.
bibtex: '@inproceedings{Hett_Frers_Widhalm_Berth_Hilleringmann_Zrenner_2016, place={Munich},
title={Silicon oxynitride microdisk resonators for integrated waveguide coupling},
booktitle={Smart Systems Integration 2016 - International Conference and Exhibition
on Integration Issues of Miniaturized Systems, SSI 2016}, author={Hett, Thomas
and Frers, Torsten and Widhalm, Alex and Berth, Gerhard and Hilleringmann, Ulrich
and Zrenner, Artur}, year={2016}, pages={400–403} }'
chicago: Hett, Thomas, Torsten Frers, Alex Widhalm, Gerhard Berth, Ulrich Hilleringmann,
and Artur Zrenner. “Silicon Oxynitride Microdisk Resonators for Integrated Waveguide
Coupling.” In Smart Systems Integration 2016 - International Conference and
Exhibition on Integration Issues of Miniaturized Systems, SSI 2016, 400–403.
Munich, 2016.
ieee: T. Hett, T. Frers, A. Widhalm, G. Berth, U. Hilleringmann, and A. Zrenner,
“Silicon oxynitride microdisk resonators for integrated waveguide coupling,” in
Smart Systems Integration 2016 - International Conference and Exhibition on
Integration Issues of Miniaturized Systems, SSI 2016, Munich, 2016, pp. 400–403.
mla: Hett, Thomas, et al. “Silicon Oxynitride Microdisk Resonators for Integrated
Waveguide Coupling.” Smart Systems Integration 2016 - International Conference
and Exhibition on Integration Issues of Miniaturized Systems, SSI 2016, 2016,
pp. 400–03.
short: 'T. Hett, T. Frers, A. Widhalm, G. Berth, U. Hilleringmann, A. Zrenner, in:
Smart Systems Integration 2016 - International Conference and Exhibition on Integration
Issues of Miniaturized Systems, SSI 2016, Munich, 2016, pp. 400–403.'
conference:
end_date: 2016-03-10
location: Munich
name: Smart Systems Integration 2016 - International Conference and Exhibition on
Integration Issues of Miniaturized Systems, SSI 2016
start_date: 2016-03-09
date_created: 2018-08-02T12:19:51Z
date_updated: 2022-01-06T06:59:36Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
language:
- iso: eng
page: 400 - 403
place: Munich
publication: Smart Systems Integration 2016 - International Conference and Exhibition
on Integration Issues of Miniaturized Systems, SSI 2016
publication_identifier:
unknown:
- 978-3-95735-040-4
publication_status: published
status: public
title: Silicon oxynitride microdisk resonators for integrated waveguide coupling
type: conference
user_id: '49428'
year: '2016'
...
---
_id: '4239'
abstract:
- lang: eng
text: "Confocal Raman spectroscopy is applied to identify ferroelectric domain structure
sensitive\r\nphonon modes in potassium titanyl phosphate. Therefore, polarization-dependent
measurements in\r\nvarious scattering configurations have been performed to characterize
the fundamental Raman\r\nspectra of the material. The obtained spectra are discussed
qualitatively based on an internal mode\r\nassignment. In the main part of this
work, we have characterized z-cut periodically poled potassium\r\ntitanyl phosphate
in terms of polarity- and structure-sensitive phonon modes. Here, we find vibrations\r\nwhose
intensities are linked to the ferroelectric domain walls. We interpret this in
terms of\r\nchanges in the polarizability originating from strain induced by domain
boundaries and the inner\r\nfield distribution. Hence, a direct and 3D visualization
of ferroelectric domain structures becomes\r\npossible in potassium titanyl phosphate."
article_number: '044103'
article_type: original
author:
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: P.
full_name: Mackwitz, P.
last_name: Mackwitz
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
citation:
ama: 'Rüsing M, Eigner C, Mackwitz P, Berth G, Silberhorn C, Zrenner A. Identification
of ferroelectric domain structure sensitive phonon modes in potassium titanyl
phosphate: A fundamental study. Journal of Applied Physics. 2016;119(4).
doi:10.1063/1.4940964'
apa: 'Rüsing, M., Eigner, C., Mackwitz, P., Berth, G., Silberhorn, C., & Zrenner,
A. (2016). Identification of ferroelectric domain structure sensitive phonon modes
in potassium titanyl phosphate: A fundamental study. Journal of Applied Physics,
119(4), Article 044103. https://doi.org/10.1063/1.4940964'
bibtex: '@article{Rüsing_Eigner_Mackwitz_Berth_Silberhorn_Zrenner_2016, title={Identification
of ferroelectric domain structure sensitive phonon modes in potassium titanyl
phosphate: A fundamental study}, volume={119}, DOI={10.1063/1.4940964},
number={4044103}, journal={Journal of Applied Physics}, publisher={AIP Publishing},
author={Rüsing, Michael and Eigner, Christof and Mackwitz, P. and Berth, Gerhard
and Silberhorn, Christine and Zrenner, Artur}, year={2016} }'
chicago: 'Rüsing, Michael, Christof Eigner, P. Mackwitz, Gerhard Berth, Christine
Silberhorn, and Artur Zrenner. “Identification of Ferroelectric Domain Structure
Sensitive Phonon Modes in Potassium Titanyl Phosphate: A Fundamental Study.” Journal
of Applied Physics 119, no. 4 (2016). https://doi.org/10.1063/1.4940964.'
ieee: 'M. Rüsing, C. Eigner, P. Mackwitz, G. Berth, C. Silberhorn, and A. Zrenner,
“Identification of ferroelectric domain structure sensitive phonon modes in potassium
titanyl phosphate: A fundamental study,” Journal of Applied Physics, vol.
119, no. 4, Art. no. 044103, 2016, doi: 10.1063/1.4940964.'
mla: 'Rüsing, Michael, et al. “Identification of Ferroelectric Domain Structure
Sensitive Phonon Modes in Potassium Titanyl Phosphate: A Fundamental Study.” Journal
of Applied Physics, vol. 119, no. 4, 044103, AIP Publishing, 2016, doi:10.1063/1.4940964.'
short: M. Rüsing, C. Eigner, P. Mackwitz, G. Berth, C. Silberhorn, A. Zrenner, Journal
of Applied Physics 119 (2016).
date_created: 2018-08-29T08:21:00Z
date_updated: 2023-10-09T08:32:15Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
- _id: '288'
doi: 10.1063/1.4940964
intvolume: ' 119'
issue: '4'
language:
- iso: eng
project:
- _id: '53'
grant_number: '231447078'
name: TRR 142
- _id: '55'
name: TRR 142 - Project Area B
- _id: '68'
grant_number: '231447078'
name: TRR 142 - Subproject B3
publication: Journal of Applied Physics
publication_identifier:
issn:
- 0021-8979
- 1089-7550
publication_status: published
publisher: AIP Publishing
status: public
title: 'Identification of ferroelectric domain structure sensitive phonon modes in
potassium titanyl phosphate: A fundamental study'
type: journal_article
user_id: '14931'
volume: 119
year: '2016'
...
---
_id: '4237'
abstract:
- lang: eng
text: "We report the fabrication of periodically poled domain patterns in x-cut
lithium niobate thin-film.\r\nHere, thin films on insulator have drawn particular
attention due to their intrinsic waveguiding\r\nproperties offering high mode
confinement and smaller devices compared to in-diffused waveguides\r\nin bulk
material. In contrast to z-cut thin film lithium niobate, the x-cut geometry does
not\r\nrequire back electrodes for poling. Further, the x-cut geometry grants
direct access to the largest\r\nnonlinear and electro-optical tensor element,
which overall promises smaller devices. The domain\r\ninversion was realized via
electric field poling utilizing deposited aluminum top electrodes on a\r\nstack
of LN thin film/SiO2 layer/Bulk LN, which were patterned by optical lithography.
The periodic\r\ndomain inversion was verified by non-invasive confocal second
harmonic microscopy. Our\r\nresults show domain patterns in accordance to the
electrode mask layout. The second harmonic signatures\r\ncan be interpreted in
terms of spatially, overlapping domain filaments which start their\r\ngrowth on
the þz side."
article_number: '152902'
article_type: original
author:
- first_name: P.
full_name: Mackwitz, P.
last_name: Mackwitz
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: A.
full_name: Widhalm, A.
last_name: Widhalm
- first_name: K.
full_name: Müller, K.
last_name: Müller
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
citation:
ama: Mackwitz P, Rüsing M, Berth G, Widhalm A, Müller K, Zrenner A. Periodic domain
inversion in x-cut single-crystal lithium niobate thin film. Applied Physics
Letters. 2016;108(15). doi:10.1063/1.4946010
apa: Mackwitz, P., Rüsing, M., Berth, G., Widhalm, A., Müller, K., & Zrenner,
A. (2016). Periodic domain inversion in x-cut single-crystal lithium niobate thin
film. Applied Physics Letters, 108(15), Article 152902. https://doi.org/10.1063/1.4946010
bibtex: '@article{Mackwitz_Rüsing_Berth_Widhalm_Müller_Zrenner_2016, title={Periodic
domain inversion in x-cut single-crystal lithium niobate thin film}, volume={108},
DOI={10.1063/1.4946010}, number={15152902},
journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Mackwitz,
P. and Rüsing, Michael and Berth, Gerhard and Widhalm, A. and Müller, K. and Zrenner,
Artur}, year={2016} }'
chicago: Mackwitz, P., Michael Rüsing, Gerhard Berth, A. Widhalm, K. Müller, and
Artur Zrenner. “Periodic Domain Inversion in X-Cut Single-Crystal Lithium Niobate
Thin Film.” Applied Physics Letters 108, no. 15 (2016). https://doi.org/10.1063/1.4946010.
ieee: 'P. Mackwitz, M. Rüsing, G. Berth, A. Widhalm, K. Müller, and A. Zrenner,
“Periodic domain inversion in x-cut single-crystal lithium niobate thin film,”
Applied Physics Letters, vol. 108, no. 15, Art. no. 152902, 2016, doi:
10.1063/1.4946010.'
mla: Mackwitz, P., et al. “Periodic Domain Inversion in X-Cut Single-Crystal Lithium
Niobate Thin Film.” Applied Physics Letters, vol. 108, no. 15, 152902,
AIP Publishing, 2016, doi:10.1063/1.4946010.
short: P. Mackwitz, M. Rüsing, G. Berth, A. Widhalm, K. Müller, A. Zrenner, Applied
Physics Letters 108 (2016).
date_created: 2018-08-29T08:16:14Z
date_updated: 2023-10-09T08:05:45Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
doi: 10.1063/1.4946010
intvolume: ' 108'
issue: '15'
language:
- iso: eng
project:
- _id: '53'
grant_number: '231447078'
name: TRR 142
- _id: '55'
name: TRR 142 - Project Area B
- _id: '68'
grant_number: '231447078'
name: TRR 142 - Subproject B3
publication: Applied Physics Letters
publication_identifier:
issn:
- 0003-6951
- 1077-3118
publication_status: published
publisher: AIP Publishing
status: public
title: Periodic domain inversion in x-cut single-crystal lithium niobate thin film
type: journal_article
user_id: '14931'
volume: 108
year: '2016'
...
---
_id: '4240'
abstract:
- lang: eng
text: Cubic gallium nitride (GaN) films are analyzed with highresolution X-ray diffraction
(HRXRD) and Raman spectroscopy. Several cubic GaN layers were grown on 3C-SiC
(001) substrate by radio-frequency plasma-assisted molecular beam epitaxy. The
layer thickness of the cubic GaN was varied between 75 and 505 nm. The HRXRD analysis
reveals a reduction of the full-width at half-maximum (FWHM) of omega scans for
growing layer thicknesses, which is caused by a partial compensation of defects.
The Raman characterization confirms well-formed c-GaN layers. A more detailed
examination of the longitudinal optical mode hints at a correlation of the FWHM
of the Raman mode with the dislocation density, which shows the possibility to
determine dislocation densities by Ramanspectroscopy on a micrometer scale, which
is not possible by HRXRD. Furthermore, this Raman analysis shows that normalized
Raman spectra present an alternative way to determine layer thicknesses of thin
GaN films.
article_type: original
author:
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: T.
full_name: Wecker, T.
last_name: Wecker
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Donat Josef
full_name: As, Donat Josef
id: '14'
last_name: As
orcid: 0000-0003-1121-3565
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
citation:
ama: Rüsing M, Wecker T, Berth G, As DJ, Zrenner A. Joint Raman spectroscopy and
HRXRD investigation of cubic gallium nitride layers grown on 3C-SiC. physica
status solidi (b). 2016;253(4):778-782. doi:10.1002/pssb.201552592
apa: Rüsing, M., Wecker, T., Berth, G., As, D. J., & Zrenner, A. (2016). Joint
Raman spectroscopy and HRXRD investigation of cubic gallium nitride layers grown
on 3C-SiC. Physica Status Solidi (b), 253(4), 778–782. https://doi.org/10.1002/pssb.201552592
bibtex: '@article{Rüsing_Wecker_Berth_As_Zrenner_2016, title={Joint Raman spectroscopy
and HRXRD investigation of cubic gallium nitride layers grown on 3C-SiC}, volume={253},
DOI={10.1002/pssb.201552592},
number={4}, journal={physica status solidi (b)}, publisher={Wiley}, author={Rüsing,
Michael and Wecker, T. and Berth, Gerhard and As, Donat Josef and Zrenner, Artur},
year={2016}, pages={778–782} }'
chicago: 'Rüsing, Michael, T. Wecker, Gerhard Berth, Donat Josef As, and Artur Zrenner.
“Joint Raman Spectroscopy and HRXRD Investigation of Cubic Gallium Nitride Layers
Grown on 3C-SiC.” Physica Status Solidi (b) 253, no. 4 (2016): 778–82.
https://doi.org/10.1002/pssb.201552592.'
ieee: 'M. Rüsing, T. Wecker, G. Berth, D. J. As, and A. Zrenner, “Joint Raman spectroscopy
and HRXRD investigation of cubic gallium nitride layers grown on 3C-SiC,” physica
status solidi (b), vol. 253, no. 4, pp. 778–782, 2016, doi: 10.1002/pssb.201552592.'
mla: Rüsing, Michael, et al. “Joint Raman Spectroscopy and HRXRD Investigation of
Cubic Gallium Nitride Layers Grown on 3C-SiC.” Physica Status Solidi (b),
vol. 253, no. 4, Wiley, 2016, pp. 778–82, doi:10.1002/pssb.201552592.
short: M. Rüsing, T. Wecker, G. Berth, D.J. As, A. Zrenner, Physica Status Solidi
(b) 253 (2016) 778–782.
date_created: 2018-08-29T08:24:01Z
date_updated: 2023-10-09T08:48:35Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
doi: 10.1002/pssb.201552592
intvolume: ' 253'
issue: '4'
keyword:
- cubic gallium nitride
- dislocation density
- HRXRD
- Raman spectroscopy
language:
- iso: eng
page: 778-782
project:
- _id: '53'
grant_number: '231447078'
name: TRR 142
- _id: '55'
name: TRR 142 - Project Area B
- _id: '68'
grant_number: '231447078'
name: TRR 142 - Subproject B3
publication: physica status solidi (b)
publication_identifier:
issn:
- 0370-1972
publication_status: published
publisher: Wiley
status: public
title: Joint Raman spectroscopy and HRXRD investigation of cubic gallium nitride layers
grown on 3C-SiC
type: journal_article
user_id: '14931'
volume: 253
year: '2016'
...
---
_id: '10026'
abstract:
- lang: eng
text: "Congruent lithium niobate and lithium tantalate mixed crystals have been
grown over the complete\r\ncompositional range with the Czochralski method. The
structural and vibrational properties of the mixed\r\ncrystals are studied extensively
by x-ray diffraction measurements, Raman spectroscopy, and density functional\r\ntheory.
The measured lattice parameters and vibrational frequencies are in good agreement
with our theoretical\r\npredictions. The observed dependence of the Raman frequencies
on the crystal composition is discussed on the\r\nbasis of the calculated phonon
displacement patterns. The phononic contribution to the static dielectric tensor\r\nis
calculated by means of the generalized Lyddane-Sachs-Teller relation. Due to the
pronounced dependence of\r\nthe optical response on the Ta concentration, lithium
niobate tantalate mixed crystals represent a perfect model\r\nsystem to study
the properties of uniaxial mixed ferroelectric materials for application in integrated
optics."
author:
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Simone
full_name: Sanna, Simone
last_name: Sanna
- first_name: Sergej
full_name: Neufeld, Sergej
id: '23261'
last_name: Neufeld
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
- first_name: H.
full_name: Yu, H.
last_name: Yu
- first_name: Y.
full_name: Wang, Y.
last_name: Wang
- first_name: H.
full_name: Zhang, H.
last_name: Zhang
citation:
ama: Rüsing M, Sanna S, Neufeld S, et al. Vibrational properties of LiNb1−xTaxO3
mixed crystals. Physical Review B. Published online 2016. doi:10.1103/physrevb.93.184305
apa: Rüsing, M., Sanna, S., Neufeld, S., Berth, G., Schmidt, W. G., Zrenner, A.,
Yu, H., Wang, Y., & Zhang, H. (2016). Vibrational properties of LiNb1−xTaxO3
mixed crystals. Physical Review B. https://doi.org/10.1103/physrevb.93.184305
bibtex: '@article{Rüsing_Sanna_Neufeld_Berth_Schmidt_Zrenner_Yu_Wang_Zhang_2016,
title={Vibrational properties of LiNb1−xTaxO3 mixed crystals}, DOI={10.1103/physrevb.93.184305},
journal={Physical Review B}, author={Rüsing, Michael and Sanna, Simone and Neufeld,
Sergej and Berth, Gerhard and Schmidt, Wolf Gero and Zrenner, Artur and Yu, H.
and Wang, Y. and Zhang, H.}, year={2016} }'
chicago: Rüsing, Michael, Simone Sanna, Sergej Neufeld, Gerhard Berth, Wolf Gero
Schmidt, Artur Zrenner, H. Yu, Y. Wang, and H. Zhang. “Vibrational Properties
of LiNb1−xTaxO3 Mixed Crystals.” Physical Review B, 2016. https://doi.org/10.1103/physrevb.93.184305.
ieee: 'M. Rüsing et al., “Vibrational properties of LiNb1−xTaxO3 mixed crystals,”
Physical Review B, 2016, doi: 10.1103/physrevb.93.184305.'
mla: Rüsing, Michael, et al. “Vibrational Properties of LiNb1−xTaxO3 Mixed Crystals.”
Physical Review B, 2016, doi:10.1103/physrevb.93.184305.
short: M. Rüsing, S. Sanna, S. Neufeld, G. Berth, W.G. Schmidt, A. Zrenner, H. Yu,
Y. Wang, H. Zhang, Physical Review B (2016).
date_created: 2019-05-29T07:55:07Z
date_updated: 2023-10-11T07:28:32Z
department:
- _id: '15'
- _id: '170'
- _id: '295'
- _id: '230'
doi: 10.1103/physrevb.93.184305
funded_apc: '1'
language:
- iso: eng
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
- _id: '53'
grant_number: '231447078'
name: TRR 142
- _id: '55'
name: TRR 142 - Project Area B
- _id: '69'
grant_number: '231447078'
name: TRR 142 - Subproject B4
- _id: '68'
grant_number: '231447078'
name: TRR 142 - Subproject B3
publication: Physical Review B
publication_identifier:
issn:
- 2469-9950
- 2469-9969
publication_status: published
status: public
title: Vibrational properties of LiNb1−xTaxO3 mixed crystals
type: journal_article
user_id: '22501'
year: '2016'
...
---
_id: '4332'
abstract:
- lang: eng
text: LiTaO3 and LiNbO3 crystals are investigated here in a combined experimental
and theoretical study that uses Raman spectroscopy in a complete set of scattering
geometries and corresponding density-functional theory calculations to provide
microscopic information on their vibrational properties. The Raman scattering
efficiency is computed from first principles in order to univocally assign the
measured Raman peaks to the calculated eigenvectors. Measured and calculated Raman
spectra are shown to be in qualitative agreement and confirm the mode assignment
by Margueron et al. [J. Appl. Phys. 111, 104105 (2012)], thus finally settling
a long debate. While the two crystals show rather similar vibrational properties
overall, the E-TO9 mode is markedly different in the two oxides. The deviations
are explained by a different anion-cation bond type in LiTaO3 and LiNbO3 crystals.
article_type: original
author:
- first_name: Simone
full_name: Sanna, Simone
last_name: Sanna
- first_name: Sergej
full_name: Neufeld, Sergej
id: '23261'
last_name: Neufeld
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
citation:
ama: Sanna S, Neufeld S, Rüsing M, Berth G, Zrenner A, Schmidt WG. Raman scattering
efficiency in LiTaO3 and LiNbO3 crystals. Physical Review B. 2015;91(22).
doi:10.1103/physrevb.91.224302
apa: Sanna, S., Neufeld, S., Rüsing, M., Berth, G., Zrenner, A., & Schmidt,
W. G. (2015). Raman scattering efficiency in LiTaO3 and LiNbO3 crystals. Physical
Review B, 91(22). https://doi.org/10.1103/physrevb.91.224302
bibtex: '@article{Sanna_Neufeld_Rüsing_Berth_Zrenner_Schmidt_2015, title={Raman
scattering efficiency in LiTaO3 and LiNbO3 crystals}, volume={91}, DOI={10.1103/physrevb.91.224302},
number={22}, journal={Physical Review B}, publisher={American Physical Society
(APS)}, author={Sanna, Simone and Neufeld, Sergej and Rüsing, Michael and Berth,
Gerhard and Zrenner, Artur and Schmidt, Wolf Gero}, year={2015} }'
chicago: Sanna, Simone, Sergej Neufeld, Michael Rüsing, Gerhard Berth, Artur Zrenner,
and Wolf Gero Schmidt. “Raman Scattering Efficiency in LiTaO3 and LiNbO3 Crystals.”
Physical Review B 91, no. 22 (2015). https://doi.org/10.1103/physrevb.91.224302.
ieee: 'S. Sanna, S. Neufeld, M. Rüsing, G. Berth, A. Zrenner, and W. G. Schmidt,
“Raman scattering efficiency in LiTaO3 and LiNbO3 crystals,” Physical Review
B, vol. 91, no. 22, 2015, doi: 10.1103/physrevb.91.224302.'
mla: Sanna, Simone, et al. “Raman Scattering Efficiency in LiTaO3 and LiNbO3 Crystals.”
Physical Review B, vol. 91, no. 22, American Physical Society (APS), 2015,
doi:10.1103/physrevb.91.224302.
short: S. Sanna, S. Neufeld, M. Rüsing, G. Berth, A. Zrenner, W.G. Schmidt, Physical
Review B 91 (2015).
date_created: 2018-08-30T13:51:38Z
date_updated: 2023-10-11T07:25:58Z
department:
- _id: '15'
- _id: '230'
doi: 10.1103/physrevb.91.224302
funded_apc: '1'
intvolume: ' 91'
issue: '22'
language:
- iso: eng
project:
- _id: '53'
grant_number: '231447078'
name: TRR 142
- _id: '55'
name: TRR 142 - Project Area B
- _id: '68'
grant_number: '231447078'
name: TRR 142 - Subproject B3
- _id: '69'
grant_number: '231447078'
name: TRR 142 - Subproject B4
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: Physical Review B
publication_identifier:
issn:
- 1098-0121
- 1550-235X
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Raman scattering efficiency in LiTaO3 and LiNbO3 crystals
type: journal_article
user_id: '22501'
volume: 91
year: '2015'
...
---
_id: '13520'
abstract:
- lang: eng
text: Atomistic simulations in the framework of the density functional theory have
been used to model morphologic and vibrational properties of lithium niobate–lithium
tantalate mixed crystals as a function of the [Nb]/[Ta] ratio. Structural parameters
such as the crystal volume and the lattice parameters a and c vary roughly linearly
from LiTaO3 to LiNbO3, showing only minor deviations from the Vegard behavior.
Our ab initio calculations demonstrate that the TO1, TO2 and TO4 vibrational modes
become harder with increasing Nb concentration. TO3 becomes softer with increasing
Nb content, instead. Furthermore, the investigated zone center A1 -TO phonon modes
are characterized by a pronounced stoichiometry dependence. Frequency shifts as
large as 30 cm−1 are expected as the [Nb]/[Ta] ratio grows from 0 to 1. Therefore,
spectroscopic techniques sensitive to the A1 modes (such as Raman spectroscopy),
can be employed for a direct and non-destructive determination of the crystal
composition.
author:
- first_name: Simone
full_name: Sanna, Simone
last_name: Sanna
- first_name: A.
full_name: Riefer, A.
last_name: Riefer
- first_name: Sergej
full_name: Neufeld, Sergej
id: '23261'
last_name: Neufeld
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: A.
full_name: Widhalm, A.
last_name: Widhalm
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
citation:
ama: Sanna S, Riefer A, Neufeld S, et al. Vibrational Fingerprints of LiNbO3-LiTaO3Mixed
Crystals. Ferroelectrics. 2013;447(1):63-68. doi:10.1080/00150193.2013.821893
apa: Sanna, S., Riefer, A., Neufeld, S., Schmidt, W. G., Berth, G., Rüsing, M.,
Widhalm, A., & Zrenner, A. (2013). Vibrational Fingerprints of LiNbO3-LiTaO3Mixed
Crystals. Ferroelectrics, 447(1), 63–68. https://doi.org/10.1080/00150193.2013.821893
bibtex: '@article{Sanna_Riefer_Neufeld_Schmidt_Berth_Rüsing_Widhalm_Zrenner_2013,
title={Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals}, volume={447},
DOI={10.1080/00150193.2013.821893},
number={1}, journal={Ferroelectrics}, author={Sanna, Simone and Riefer, A. and
Neufeld, Sergej and Schmidt, Wolf Gero and Berth, Gerhard and Rüsing, Michael
and Widhalm, A. and Zrenner, Artur}, year={2013}, pages={63–68} }'
chicago: 'Sanna, Simone, A. Riefer, Sergej Neufeld, Wolf Gero Schmidt, Gerhard Berth,
Michael Rüsing, A. Widhalm, and Artur Zrenner. “Vibrational Fingerprints of LiNbO3-LiTaO3Mixed
Crystals.” Ferroelectrics 447, no. 1 (2013): 63–68. https://doi.org/10.1080/00150193.2013.821893.'
ieee: 'S. Sanna et al., “Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals,”
Ferroelectrics, vol. 447, no. 1, pp. 63–68, 2013, doi: 10.1080/00150193.2013.821893.'
mla: Sanna, Simone, et al. “Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals.”
Ferroelectrics, vol. 447, no. 1, 2013, pp. 63–68, doi:10.1080/00150193.2013.821893.
short: S. Sanna, A. Riefer, S. Neufeld, W.G. Schmidt, G. Berth, M. Rüsing, A. Widhalm,
A. Zrenner, Ferroelectrics 447 (2013) 63–68.
date_created: 2019-09-30T13:50:40Z
date_updated: 2023-10-09T08:22:10Z
department:
- _id: '15'
- _id: '170'
- _id: '295'
- _id: '230'
doi: 10.1080/00150193.2013.821893
intvolume: ' 447'
issue: '1'
keyword:
- Ferroelectrics
- vibrational properties
- LiNbO3
- LiTaO3
- mixed crystals
language:
- iso: eng
page: 63-68
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: Ferroelectrics
publication_identifier:
issn:
- 0015-0193
- 1563-5112
publication_status: published
status: public
title: Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals
type: journal_article
user_id: '14931'
volume: 447
year: '2013'
...
---
_id: '47940'
abstract:
- lang: eng
text: Copper oxide and cobalt oxide (CuO, Co3O4) nanocrystals (NCs) have been successfully
prepared in a short time using microwave irradiation without any postannealing
treatment. Both kinds of nanocrystals (NCs) have been prepared using copper nitrate
and cobalt nitrate as the starting materials and distilled water as the solvent.
The resulted powders of nanocrystals (NCs) were characterized by X-ray diffraction
(XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM),
and atomic force microscopy (AFM) measurements. The obtained results confirm the
presence of the both of oxides nanopowders produced during chemical precipitation
using microwave irradiation. A strong emission under UV excitation is obtained
from the prepared CuO and Co3O4 nanoparticles. The results show that the nanoparticles
have high dispersion and narrow size distribution. The line scans of atomic force
microscopy (AFM) images of the nanocrystals (NCs) sprayed on GaAs substrates confirm
the results of both X-ray diffraction and transmission electron microscopy. Furthermore,
vibrational studies have been carried out using Raman spectroscopic technique.
Specific Raman peaks have been observed in the CuO and Co3O4 nanostructures, and
the full width at half maximum (FWHM) of the peaks indicates a small particle
size of the nanocrystals.
article_type: original
author:
- first_name: M.
full_name: Rashad, M.
last_name: Rashad
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: K.
full_name: Lischka, K.
last_name: Lischka
- first_name: A.
full_name: Pawlis, A.
last_name: Pawlis
citation:
ama: 'Rashad M, Rüsing M, Berth G, Lischka K, Pawlis A. CuO and Co3O4 Nanoparticles:
Synthesis, Characterizations, and Raman Spectroscopy. Journal of Nanomaterials.
2013;2013:714853. doi:10.1155/2013/714853'
apa: 'Rashad, M., Rüsing, M., Berth, G., Lischka, K., & Pawlis, A. (2013). CuO
and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy.
Journal of Nanomaterials, 2013, 714853. https://doi.org/10.1155/2013/714853'
bibtex: '@article{Rashad_Rüsing_Berth_Lischka_Pawlis_2013, title={CuO and Co3O4
Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy}, volume={2013},
DOI={10.1155/2013/714853}, journal={Journal
of Nanomaterials}, publisher={Hindawi Limited}, author={Rashad, M. and Rüsing,
Michael and Berth, Gerhard and Lischka, K. and Pawlis, A.}, year={2013}, pages={714853}
}'
chicago: 'Rashad, M., Michael Rüsing, Gerhard Berth, K. Lischka, and A. Pawlis.
“CuO and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy.”
Journal of Nanomaterials 2013 (2013): 714853. https://doi.org/10.1155/2013/714853.'
ieee: 'M. Rashad, M. Rüsing, G. Berth, K. Lischka, and A. Pawlis, “CuO and Co3O4
Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy,” Journal
of Nanomaterials, vol. 2013, p. 714853, 2013, doi: 10.1155/2013/714853.'
mla: 'Rashad, M., et al. “CuO and Co3O4 Nanoparticles: Synthesis, Characterizations,
and Raman Spectroscopy.” Journal of Nanomaterials, vol. 2013, Hindawi Limited,
2013, p. 714853, doi:10.1155/2013/714853.'
short: M. Rashad, M. Rüsing, G. Berth, K. Lischka, A. Pawlis, Journal of Nanomaterials
2013 (2013) 714853.
date_created: 2023-10-11T07:09:27Z
date_updated: 2023-10-11T07:24:25Z
department:
- _id: '15'
doi: 10.1155/2013/714853
intvolume: ' 2013'
keyword:
- General Materials Science
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://dl.acm.org/doi/pdf/10.1155/2013/714853
oa: '1'
page: '714853'
publication: Journal of Nanomaterials
publication_identifier:
eissn:
- 1687-4129
issn:
- 1687-4110
publication_status: published
publisher: Hindawi Limited
quality_controlled: '1'
status: public
title: 'CuO and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy'
type: journal_article
user_id: '22501'
volume: 2013
year: '2013'
...
---
_id: '4380'
abstract:
- lang: eng
text: The structural and vibrational properties of lithium niobate (LN) – lithium
tantalate (LT) mixed crystals (LNT, LiNb1-xTaxO3) are investigated over the whole
composition range by first-principles simulations. The crystal volume grows roughly
linearly from LT to LN, whereby the lattice parameters a and c show minor deviations
from the Vegard behavior between the end compounds, LiNbO3 and LiTaO3. Our calculations
in the framework of the density functional theory show the TO1, TO2 and TO4-modes
to become harder with increasing Nb concentration. TO3 becomes softer with increasing
Nb content, instead. The frequency shifts of the zone center A1-TO phonon modes
for crystals with different compositions are found to be as large as 30 cm-1.
Raman spectroscopy, which is sensitive to the A1 modes, can be therefore employed
to determine the crystal composition.
author:
- first_name: Simone
full_name: Sanna, Simone
last_name: Sanna
- first_name: Arthur
full_name: Riefer, Arthur
last_name: Riefer
- first_name: Sergej
full_name: Neufeld, Sergej
last_name: Neufeld
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
last_name: Schmidt
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Alex
full_name: Widhalm, Alex
last_name: Widhalm
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
citation:
ama: 'Sanna S, Riefer A, Neufeld S, et al. Vibrational fingerprints of LiNbO3-LiTaO3
mixed crystals. In: Proceedings of ISAF-ECAPD-PFM 2012. ; 2012.'
apa: Sanna, S., Riefer, A., Neufeld, S., Schmidt, W. G., Berth, G., Widhalm, A.,
& Zrenner, A. (2012). Vibrational fingerprints of LiNbO3-LiTaO3 mixed crystals.
In Proceedings of ISAF-ECAPD-PFM 2012. Aveiro, Portugal.
bibtex: '@inproceedings{Sanna_Riefer_Neufeld_Schmidt_Berth_Widhalm_Zrenner_2012,
title={Vibrational fingerprints of LiNbO3-LiTaO3 mixed crystals}, booktitle={Proceedings
of ISAF-ECAPD-PFM 2012}, author={Sanna, Simone and Riefer, Arthur and Neufeld,
Sergej and Schmidt, Wolf Gero and Berth, Gerhard and Widhalm, Alex and Zrenner,
Artur}, year={2012} }'
chicago: Sanna, Simone, Arthur Riefer, Sergej Neufeld, Wolf Gero Schmidt, Gerhard
Berth, Alex Widhalm, and Artur Zrenner. “Vibrational Fingerprints of LiNbO3-LiTaO3
Mixed Crystals.” In Proceedings of ISAF-ECAPD-PFM 2012, 2012.
ieee: S. Sanna et al., “Vibrational fingerprints of LiNbO3-LiTaO3 mixed crystals,”
in Proceedings of ISAF-ECAPD-PFM 2012, Aveiro, Portugal, 2012.
mla: Sanna, Simone, et al. “Vibrational Fingerprints of LiNbO3-LiTaO3 Mixed Crystals.”
Proceedings of ISAF-ECAPD-PFM 2012, 2012.
short: 'S. Sanna, A. Riefer, S. Neufeld, W.G. Schmidt, G. Berth, A. Widhalm, A.
Zrenner, in: Proceedings of ISAF-ECAPD-PFM 2012, 2012.'
conference:
end_date: 2012-07-13
location: Aveiro, Portugal
name: 2012 INTERNATIONAL SYMPOSIUM ON APPLICATIONS OF FERROELECTRICS HELD JOINTLY
WITH 11TH IEEE ECAPD AND IEEE PFM (ISAF/ECAPD/PFM)
start_date: 2012-07-09
date_created: 2018-09-12T14:32:09Z
date_updated: 2022-01-06T07:01:00Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
keyword:
- Ferroelectrics
- Vibrational properties
- LiNbO3
- LiTaO3
- Mixed Crystals
publication: Proceedings of ISAF-ECAPD-PFM 2012
status: public
title: Vibrational fingerprints of LiNbO3-LiTaO3 mixed crystals
type: conference
user_id: '49428'
year: '2012'
...
---
_id: '4544'
abstract:
- lang: eng
text: The existence of localized vibrational modes both at the positive and at the
negative LiNbO3 (0001) surface is demonstrated by means of first-principles calculations
and Raman spectroscopy measurements. First, the phonon modes of the crystal bulk
and of the (0001) surface are calculated within the density functional theory.
In a second step, the Raman spectra of LiNbO3 bulk and of the two surfaces are
measured. The phonon modes localized at the two surfaces are found to be substantially
different, and are also found to differ from the bulk modes. The calculated and
measured frequencies are in agreement within the error of the method. Raman spectroscopy
is shown to be sensitive to differences between bulk and surface and between positive
and negative surface. It represents therefore an alternative method to determine
the surface polarity, which does not exploit the pyroelectric or piezoelectric
properties of the material.
article_type: original
author:
- first_name: S.
full_name: Sanna, S.
last_name: Sanna
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: W.
full_name: Hahn, W.
last_name: Hahn
- first_name: A.
full_name: Widhalm, A.
last_name: Widhalm
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
- first_name: W. G.
full_name: Schmidt, W. G.
last_name: Schmidt
citation:
ama: Sanna S, Berth G, Hahn W, Widhalm A, Zrenner A, Schmidt WG. Vibrational properties
of the LiNbO3 z-surfaces. IEEE Transactions on Ultrasonics, Ferroelectrics
and Frequency Control. 2011;58(9):1751-1756. doi:10.1109/tuffc.2011.2012
apa: Sanna, S., Berth, G., Hahn, W., Widhalm, A., Zrenner, A., & Schmidt, W.
G. (2011). Vibrational properties of the LiNbO3 z-surfaces. IEEE Transactions
on Ultrasonics, Ferroelectrics and Frequency Control, 58(9), 1751–1756.
https://doi.org/10.1109/tuffc.2011.2012
bibtex: '@article{Sanna_Berth_Hahn_Widhalm_Zrenner_Schmidt_2011, title={Vibrational
properties of the LiNbO3 z-surfaces}, volume={58}, DOI={10.1109/tuffc.2011.2012},
number={9}, journal={IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency
Control}, publisher={Institute of Electrical and Electronics Engineers (IEEE)},
author={Sanna, S. and Berth, Gerhard and Hahn, W. and Widhalm, A. and Zrenner,
Artur and Schmidt, W. G.}, year={2011}, pages={1751–1756} }'
chicago: 'Sanna, S., Gerhard Berth, W. Hahn, A. Widhalm, Artur Zrenner, and W. G.
Schmidt. “Vibrational Properties of the LiNbO3 Z-Surfaces.” IEEE Transactions
on Ultrasonics, Ferroelectrics and Frequency Control 58, no. 9 (2011): 1751–56.
https://doi.org/10.1109/tuffc.2011.2012.'
ieee: S. Sanna, G. Berth, W. Hahn, A. Widhalm, A. Zrenner, and W. G. Schmidt, “Vibrational
properties of the LiNbO3 z-surfaces,” IEEE Transactions on Ultrasonics, Ferroelectrics
and Frequency Control, vol. 58, no. 9, pp. 1751–1756, 2011.
mla: Sanna, S., et al. “Vibrational Properties of the LiNbO3 Z-Surfaces.” IEEE
Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 58,
no. 9, Institute of Electrical and Electronics Engineers (IEEE), 2011, pp. 1751–56,
doi:10.1109/tuffc.2011.2012.
short: S. Sanna, G. Berth, W. Hahn, A. Widhalm, A. Zrenner, W.G. Schmidt, IEEE Transactions
on Ultrasonics, Ferroelectrics and Frequency Control 58 (2011) 1751–1756.
date_created: 2018-09-20T11:33:31Z
date_updated: 2022-01-06T07:01:09Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
doi: 10.1109/tuffc.2011.2012
intvolume: ' 58'
issue: '9'
language:
- iso: eng
page: 1751-1756
publication: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
publication_identifier:
issn:
- 0885-3010
publication_status: published
publisher: Institute of Electrical and Electronics Engineers (IEEE)
status: public
title: Vibrational properties of the LiNbO3 z-surfaces
type: journal_article
user_id: '49428'
volume: 58
year: '2011'
...
---
_id: '4545'
abstract:
- lang: eng
text: Laser irradiation damage in ZnTe epilayers was analyzed in situ by power-density-dependent
and time-resolved micro-Raman spectroscopy. Damage by ablation or compound decomposition
on the sample surface was revealed by the decrease of the ZnTe–nLO mode intensity
with the increase of laser power density. The appearance of the peaks associated
with the stronger crystalline-tellurium modes, tellurium aggregates and second-order
Raman scattering at room temperature μ-Raman spectra was observed for higher power
densities than 4.4 × 105 W cm−2. The Raman signal time transients of ZnTe–nLO
and crystalline-tellurium modes reveal an exponential evolution of the laser irradiation
damage and a fast formation of crystalline tellurium aggregates on the layer surface.
article_number: '105023'
article_type: original
author:
- first_name: V
full_name: Wiedemeier, V
last_name: Wiedemeier
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
- first_name: E M
full_name: Larramendi, E M
last_name: Larramendi
- first_name: U
full_name: Woggon, U
last_name: Woggon
- first_name: K
full_name: Lischka, K
last_name: Lischka
- first_name: D
full_name: Schikora, D
last_name: Schikora
citation:
ama: Wiedemeier V, Berth G, Zrenner A, et al. In situ characterization of ZnTe epilayer
irradiation via time-resolved and power-density-dependent Raman spectroscopy.
Semiconductor Science and Technology. 2011;26(10). doi:10.1088/0268-1242/26/10/105023
apa: Wiedemeier, V., Berth, G., Zrenner, A., Larramendi, E. M., Woggon, U., Lischka,
K., & Schikora, D. (2011). In situ characterization of ZnTe epilayer irradiation
via time-resolved and power-density-dependent Raman spectroscopy. Semiconductor
Science and Technology, 26(10). https://doi.org/10.1088/0268-1242/26/10/105023
bibtex: '@article{Wiedemeier_Berth_Zrenner_Larramendi_Woggon_Lischka_Schikora_2011,
title={In situ characterization of ZnTe epilayer irradiation via time-resolved
and power-density-dependent Raman spectroscopy}, volume={26}, DOI={10.1088/0268-1242/26/10/105023},
number={10105023}, journal={Semiconductor Science and Technology}, publisher={IOP
Publishing}, author={Wiedemeier, V and Berth, Gerhard and Zrenner, Artur and Larramendi,
E M and Woggon, U and Lischka, K and Schikora, D}, year={2011} }'
chicago: Wiedemeier, V, Gerhard Berth, Artur Zrenner, E M Larramendi, U Woggon,
K Lischka, and D Schikora. “In Situ Characterization of ZnTe Epilayer Irradiation
via Time-Resolved and Power-Density-Dependent Raman Spectroscopy.” Semiconductor
Science and Technology 26, no. 10 (2011). https://doi.org/10.1088/0268-1242/26/10/105023.
ieee: V. Wiedemeier et al., “In situ characterization of ZnTe epilayer irradiation
via time-resolved and power-density-dependent Raman spectroscopy,” Semiconductor
Science and Technology, vol. 26, no. 10, 2011.
mla: Wiedemeier, V., et al. “In Situ Characterization of ZnTe Epilayer Irradiation
via Time-Resolved and Power-Density-Dependent Raman Spectroscopy.” Semiconductor
Science and Technology, vol. 26, no. 10, 105023, IOP Publishing, 2011, doi:10.1088/0268-1242/26/10/105023.
short: V. Wiedemeier, G. Berth, A. Zrenner, E.M. Larramendi, U. Woggon, K. Lischka,
D. Schikora, Semiconductor Science and Technology 26 (2011).
date_created: 2018-09-20T11:36:28Z
date_updated: 2022-01-06T07:01:09Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
doi: 10.1088/0268-1242/26/10/105023
intvolume: ' 26'
issue: '10'
language:
- iso: eng
publication: Semiconductor Science and Technology
publication_identifier:
issn:
- 0268-1242
- 1361-6641
publication_status: published
publisher: IOP Publishing
status: public
title: In situ characterization of ZnTe epilayer irradiation via time-resolved and
power-density-dependent Raman spectroscopy
type: journal_article
user_id: '49428'
volume: 26
year: '2011'
...
---
_id: '4546'
abstract:
- lang: eng
text: Silicon oxynitride (SiON) layers for telecommunication device application
are grown by Plasma Enhanced Chemical Vapor Deposition (PECVD) for various gas
compositions of SiH4, N2O and NH3. Processing and annealing effects on the oxynitride
films were studied by Fourier Transform Infrared Spectroscopy (FTIR) and Atomic
Force Microscopy (AFM) measurements. By reduction of the silane (SiH4) gas flow
and enhancement of the PECVD deposition temperature, the absorption loss due to
NH bands can be nearly completely erased. Furthermore the surface roughness can
be reduced by decreasing the gas flow and rising the deposition temperature. First
waveguide structures are introduced and their characterization is presented.
author:
- first_name: Torsten
full_name: Frers, Torsten
last_name: Frers
- first_name: Thomas
full_name: Hett, Thomas
last_name: Hett
- first_name: Ulrich
full_name: Hilleringmann, Ulrich
last_name: Hilleringmann
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Alex
full_name: Widhalm, Alex
last_name: Widhalm
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
citation:
ama: 'Frers T, Hett T, Hilleringmann U, Berth G, Widhalm A, Zrenner A. Characterization
of SiON integrated waveguides via FTIR and AFM measurements. In: 2011 Semiconductor
Conference Dresden. IEEE; 2011. doi:10.1109/scd.2011.6068744'
apa: 'Frers, T., Hett, T., Hilleringmann, U., Berth, G., Widhalm, A., & Zrenner,
A. (2011). Characterization of SiON integrated waveguides via FTIR and AFM measurements.
In 2011 Semiconductor Conference Dresden. Dresden, Germany: IEEE. https://doi.org/10.1109/scd.2011.6068744'
bibtex: '@inproceedings{Frers_Hett_Hilleringmann_Berth_Widhalm_Zrenner_2011, title={Characterization
of SiON integrated waveguides via FTIR and AFM measurements}, DOI={10.1109/scd.2011.6068744},
booktitle={2011 Semiconductor Conference Dresden}, publisher={IEEE}, author={Frers,
Torsten and Hett, Thomas and Hilleringmann, Ulrich and Berth, Gerhard and Widhalm,
Alex and Zrenner, Artur}, year={2011} }'
chicago: Frers, Torsten, Thomas Hett, Ulrich Hilleringmann, Gerhard Berth, Alex
Widhalm, and Artur Zrenner. “Characterization of SiON Integrated Waveguides via
FTIR and AFM Measurements.” In 2011 Semiconductor Conference Dresden. IEEE,
2011. https://doi.org/10.1109/scd.2011.6068744.
ieee: T. Frers, T. Hett, U. Hilleringmann, G. Berth, A. Widhalm, and A. Zrenner,
“Characterization of SiON integrated waveguides via FTIR and AFM measurements,”
in 2011 Semiconductor Conference Dresden, Dresden, Germany, 2011.
mla: Frers, Torsten, et al. “Characterization of SiON Integrated Waveguides via
FTIR and AFM Measurements.” 2011 Semiconductor Conference Dresden, IEEE,
2011, doi:10.1109/scd.2011.6068744.
short: 'T. Frers, T. Hett, U. Hilleringmann, G. Berth, A. Widhalm, A. Zrenner, in:
2011 Semiconductor Conference Dresden, IEEE, 2011.'
conference:
end_date: 2011-09-28
location: Dresden, Germany
name: 2011 Semiconductor Conference Dresden
start_date: 2011-09-27
date_created: 2018-09-20T11:44:50Z
date_updated: 2022-01-06T07:01:09Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
doi: 10.1109/scd.2011.6068744
language:
- iso: eng
publication: 2011 Semiconductor Conference Dresden
publication_identifier:
isbn:
- '9781457704314'
publication_status: published
publisher: IEEE
status: public
title: Characterization of SiON integrated waveguides via FTIR and AFM measurements
type: conference
user_id: '49428'
year: '2011'
...
---
_id: '4377'
abstract:
- lang: eng
text: Confocal Raman spectroscopy was performed as an archetype imaging method to
study the ferroelectric domain structure of periodically poled lithium niobate.
More precisely, the linkage out of spatial resolution and spectral information
proved itself as very useful. Here a specific modulation of the Raman lines by
the local variation of polarity and a non-symmetric measuring-signal across the
domain structure were found, which allows for imaging of domain boundaries as
well as oppositely orientated domains. The high potential of this method is demonstrated
by the visualization of the ferroelectric domain structures based on various phonon
modes.
article_type: original
author:
- first_name: Gerhard
full_name: Berth, Gerhard
id: '53'
last_name: Berth
- first_name: Wjatscheslaw
full_name: Hahn, Wjatscheslaw
last_name: Hahn
- first_name: Volker
full_name: Wiedemeier, Volker
last_name: Wiedemeier
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
- first_name: Simone
full_name: Sanna, Simone
last_name: Sanna
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
last_name: Schmidt
citation:
ama: Berth G, Hahn W, Wiedemeier V, Zrenner A, Sanna S, Schmidt WG. Imaging of the
Ferroelectric Domain Structures by Confocal Raman Spectroscopy. Ferroelectrics.
2011;420(1):44-48. doi:10.1080/00150193.2011.594774
apa: Berth, G., Hahn, W., Wiedemeier, V., Zrenner, A., Sanna, S., & Schmidt,
W. G. (2011). Imaging of the Ferroelectric Domain Structures by Confocal Raman
Spectroscopy. Ferroelectrics, 420(1), 44–48. https://doi.org/10.1080/00150193.2011.594774
bibtex: '@article{Berth_Hahn_Wiedemeier_Zrenner_Sanna_Schmidt_2011, title={Imaging
of the Ferroelectric Domain Structures by Confocal Raman Spectroscopy}, volume={420},
DOI={10.1080/00150193.2011.594774},
number={1}, journal={Ferroelectrics}, publisher={Informa UK Limited}, author={Berth,
Gerhard and Hahn, Wjatscheslaw and Wiedemeier, Volker and Zrenner, Artur and Sanna,
Simone and Schmidt, Wolf Gero}, year={2011}, pages={44–48} }'
chicago: 'Berth, Gerhard, Wjatscheslaw Hahn, Volker Wiedemeier, Artur Zrenner, Simone
Sanna, and Wolf Gero Schmidt. “Imaging of the Ferroelectric Domain Structures
by Confocal Raman Spectroscopy.” Ferroelectrics 420, no. 1 (2011): 44–48.
https://doi.org/10.1080/00150193.2011.594774.'
ieee: G. Berth, W. Hahn, V. Wiedemeier, A. Zrenner, S. Sanna, and W. G. Schmidt,
“Imaging of the Ferroelectric Domain Structures by Confocal Raman Spectroscopy,”
Ferroelectrics, vol. 420, no. 1, pp. 44–48, 2011.
mla: Berth, Gerhard, et al. “Imaging of the Ferroelectric Domain Structures by Confocal
Raman Spectroscopy.” Ferroelectrics, vol. 420, no. 1, Informa UK Limited,
2011, pp. 44–48, doi:10.1080/00150193.2011.594774.
short: G. Berth, W. Hahn, V. Wiedemeier, A. Zrenner, S. Sanna, W.G. Schmidt, Ferroelectrics
420 (2011) 44–48.
date_created: 2018-09-11T14:10:35Z
date_updated: 2022-01-06T07:01:00Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
doi: 10.1080/00150193.2011.594774
intvolume: ' 420'
issue: '1'
keyword:
- Raman spectroscopy
- ferroelectric domains
- LiNbO3
- confocal imaging
language:
- iso: eng
page: 44-48
publication: Ferroelectrics
publication_identifier:
issn:
- 0015-0193
- 1563-5112
publication_status: published
publisher: Informa UK Limited
status: public
title: Imaging of the Ferroelectric Domain Structures by Confocal Raman Spectroscopy
type: journal_article
user_id: '49428'
volume: 420
year: '2011'
...