---
_id: '52738'
abstract:
- lang: eng
text: Through tailoring the geometry and design of biomaterials, additive
manufacturing is revolutionizing the production of metallic patient-specific implants,
e.g., the Ti-6Al-7Nb alloy. Unfortunately, studies investigating this alloy showed
that additively produced samples exhibit anisotropic microstructures. This anisotropy
compromises the mechanical properties and complicates the loading state in the
implant. Moreover, the minimum requirements as specified per designated standards
such as ISO 5832-11 are not met. The remedy to this problem is performing a conventional
heat treatment. As this route requires energy, infrastructure, labor, and expertise,
which in turn mean time and money, many of the additive manufacturing benefits
are negated. Thus, the goal of this work was to achieve better isotropy by applying
only adapted additive manufacturing process parameters, specifically focusing
on the build orientations. In this work, samples orientated in 90°, 45°, and 0°
directions relative to the building platform were manufactured and tested. These
tests included mechanical (tensile and fatigue tests) as well as microstructural
analyses (SEM and EBSD). Subsequently, the results of these tests such as fractography
were correlated with the acquired mechanical properties. These showed that 90°-aligned
samples performed best under fatigue load and that all requirements specified
by the standard regarding monotonic load were met.
article_number: '117'
author:
- first_name: Dennis
full_name: Milaege, Dennis
id: '35461'
last_name: Milaege
- first_name: Niklas
full_name: Eschemann, Niklas
last_name: Eschemann
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
id: '48411'
last_name: Hoyer
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: Milaege D, Eschemann N, Hoyer K-P, Schaper M. Anisotropic Mechanical and Microstructural
Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via
Laser Powder Bed Fusion. Crystals. 2024;14(2). doi:10.3390/cryst14020117
apa: Milaege, D., Eschemann, N., Hoyer, K.-P., & Schaper, M. (2024). Anisotropic
Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical
Applications Manufactured via Laser Powder Bed Fusion. Crystals, 14(2),
Article 117. https://doi.org/10.3390/cryst14020117
bibtex: '@article{Milaege_Eschemann_Hoyer_Schaper_2024, title={Anisotropic Mechanical
and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications
Manufactured via Laser Powder Bed Fusion}, volume={14}, DOI={10.3390/cryst14020117},
number={2117}, journal={Crystals}, publisher={MDPI AG}, author={Milaege, Dennis
and Eschemann, Niklas and Hoyer, Kay-Peter and Schaper, Mirko}, year={2024} }'
chicago: Milaege, Dennis, Niklas Eschemann, Kay-Peter Hoyer, and Mirko Schaper.
“Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for
Biomedical Applications Manufactured via Laser Powder Bed Fusion.” Crystals
14, no. 2 (2024). https://doi.org/10.3390/cryst14020117.
ieee: 'D. Milaege, N. Eschemann, K.-P. Hoyer, and M. Schaper, “Anisotropic Mechanical
and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications
Manufactured via Laser Powder Bed Fusion,” Crystals, vol. 14, no. 2, Art.
no. 117, 2024, doi: 10.3390/cryst14020117.'
mla: Milaege, Dennis, et al. “Anisotropic Mechanical and Microstructural Properties
of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder
Bed Fusion.” Crystals, vol. 14, no. 2, 117, MDPI AG, 2024, doi:10.3390/cryst14020117.
short: D. Milaege, N. Eschemann, K.-P. Hoyer, M. Schaper, Crystals 14 (2024).
date_created: 2024-03-22T13:46:37Z
date_updated: 2024-03-22T14:22:36Z
department:
- _id: '158'
- _id: '321'
doi: 10.3390/cryst14020117
intvolume: ' 14'
issue: '2'
keyword:
- Inorganic Chemistry
- Condensed Matter Physics
- General Materials Science
- General Chemical Engineering
language:
- iso: eng
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy
for Biomedical Applications Manufactured via Laser Powder Bed Fusion
type: journal_article
user_id: '35461'
volume: 14
year: '2024'
...
---
_id: '37200'
abstract:
- lang: eng
text: (1) This work answers the question of whether and to what extent there
is a significant difference in mechanical properties when different additive manufacturing
processes are applied to the material 1.2709. The Laser-Powder-Bed-Fusion (L-PBF)
and Laser-Metal-Deposition (LMD) processes are considered, as they differ fundamentally
in the way a part is manufactured. (2) Known process parameters for low-porosity
parts were used to fabricate tensile strength specimens. Half of the specimens
were heat-treated, and all specimens were tested for mechanical properties in
a quasi-static tensile test. In addition, the material hardness was determined.
(3) It was found that, firstly, heat treatment resulted in a sharp increase in
mechanical properties such as hardness, elastic modulus, yield strength and ultimate
strength. In addition to the increase in these properties, the elongation at break
also decreases significantly after heat treatment. The choice of process, on the
other hand, does not give either process a clear advantage in terms of mechanical
properties but shows that it is necessary to consider the essential mechanical
properties for a desired application.
article_number: '157'
article_type: original
author:
- first_name: Stefan
full_name: Gnaase, Stefan
id: '25730'
last_name: Gnaase
- first_name: Dennis
full_name: Niggemeyer, Dennis
id: '77214'
last_name: Niggemeyer
- first_name: Dennis
full_name: Lehnert, Dennis
id: '90491'
last_name: Lehnert
- first_name: Christian
full_name: Bödger, Christian
id: '93904'
last_name: Bödger
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
citation:
ama: Gnaase S, Niggemeyer D, Lehnert D, Bödger C, Tröster T. Comparative Study of
the Influence of Heat Treatment and Additive Manufacturing Process (LMD &
L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709. Crystals.
2023;13(2). doi:10.3390/cryst13020157
apa: Gnaase, S., Niggemeyer, D., Lehnert, D., Bödger, C., & Tröster, T. (2023).
Comparative Study of the Influence of Heat Treatment and Additive Manufacturing
Process (LMD & L-PBF) on the Mechanical Properties of Specimens Manufactured
from 1.2709. Crystals, 13(2), Article 157. https://doi.org/10.3390/cryst13020157
bibtex: '@article{Gnaase_Niggemeyer_Lehnert_Bödger_Tröster_2023, title={Comparative
Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD
& L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709},
volume={13}, DOI={10.3390/cryst13020157},
number={2157}, journal={Crystals}, publisher={MDPI AG}, author={Gnaase, Stefan
and Niggemeyer, Dennis and Lehnert, Dennis and Bödger, Christian and Tröster,
Thomas}, year={2023} }'
chicago: Gnaase, Stefan, Dennis Niggemeyer, Dennis Lehnert, Christian Bödger, and
Thomas Tröster. “Comparative Study of the Influence of Heat Treatment and Additive
Manufacturing Process (LMD & L-PBF) on the Mechanical Properties of Specimens
Manufactured from 1.2709.” Crystals 13, no. 2 (2023). https://doi.org/10.3390/cryst13020157.
ieee: 'S. Gnaase, D. Niggemeyer, D. Lehnert, C. Bödger, and T. Tröster, “Comparative
Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD
& L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709,”
Crystals, vol. 13, no. 2, Art. no. 157, 2023, doi: 10.3390/cryst13020157.'
mla: Gnaase, Stefan, et al. “Comparative Study of the Influence of Heat Treatment
and Additive Manufacturing Process (LMD & L-PBF) on the Mechanical Properties
of Specimens Manufactured from 1.2709.” Crystals, vol. 13, no. 2, 157,
MDPI AG, 2023, doi:10.3390/cryst13020157.
short: S. Gnaase, D. Niggemeyer, D. Lehnert, C. Bödger, T. Tröster, Crystals 13
(2023).
date_created: 2023-01-18T05:44:59Z
date_updated: 2023-05-26T07:14:11Z
department:
- _id: '149'
- _id: '9'
- _id: '321'
doi: 10.3390/cryst13020157
intvolume: ' 13'
issue: '2'
keyword:
- Inorganic Chemistry
- Condensed Matter Physics
- General Materials Science
- General Chemical Engineering
language:
- iso: eng
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Comparative Study of the Influence of Heat Treatment and Additive Manufacturing
Process (LMD & L-PBF) on the Mechanical Properties of Specimens Manufactured
from 1.2709
type: journal_article
user_id: '90491'
volume: 13
year: '2023'
...
---
_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: '49107'
abstract:
- lang: eng
text: The effect of plaque deposition (atherosclerosis) on blood flow behaviour
is investigated via computational fluid dynamics and structural mechanics simulations.
To mitigate the narrowing of coronary artery atherosclerosis (stenosis), the computational
modelling of auxetic and non-auxetic stents was performed in this study to minimise
or even avoid these deposition agents in the future. Computational modelling was
performed in unrestricted (open) conditions and restricted (in an artery) conditions.
Finally, stent designs were produced by additive manufacturing, and mechanical
testing of the stents was undertaken. Auxetic stent 1 and auxetic stent 2 exhibit
very little foreshortening and radial recoil in unrestricted deployment conditions
compared to non-auxetic stent 3. However, stent 2 shows structural instability
(strut failure) during unrestricted deployment conditions. For the restricted
deployment condition, stent 1 shows a higher radial recoil compared to stent 3.
In the tensile test simulations, short elongation for stent 1 due to strut failure
is demonstrated, whereas no structural instability is noticed for stent 2 and
stent 3 until 0.5 (mm/mm) strain. The as-built samples show a significant thickening
of the struts of the stents resulting in short elongations during tensile testing
compared to the simulations (stent 2 and stent 3). A modelling framework for the
stent deployment system that enables the selection of appropriate stent designs
before in vivo testing is required. This leads to the acceleration of the development
process and a reduction in time, resulting in less material wastage. The modelling
framework shall be useful for doctors designing patient-specific stents.
article_number: '1592'
author:
- first_name: Sudipta
full_name: Pramanik, Sudipta
last_name: Pramanik
- first_name: Dennis
full_name: Milaege, Dennis
last_name: Milaege
- first_name: Maxwell
full_name: Hein, Maxwell
id: '52771'
last_name: Hein
orcid: 0000-0002-3732-2236
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
id: '48411'
last_name: Hoyer
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: 'Pramanik S, Milaege D, Hein M, Hoyer K-P, Schaper M. Additive Manufacturing
and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents:
A Combined Experimental and Computational Modelling Approach. Crystals.
2023;13(11). doi:10.3390/cryst13111592'
apa: 'Pramanik, S., Milaege, D., Hein, M., Hoyer, K.-P., & Schaper, M. (2023).
Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn
Biomedical Stents: A Combined Experimental and Computational Modelling Approach.
Crystals, 13(11), Article 1592. https://doi.org/10.3390/cryst13111592'
bibtex: '@article{Pramanik_Milaege_Hein_Hoyer_Schaper_2023, title={Additive Manufacturing
and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents:
A Combined Experimental and Computational Modelling Approach}, volume={13}, DOI={10.3390/cryst13111592}, number={111592},
journal={Crystals}, publisher={MDPI AG}, author={Pramanik, Sudipta and Milaege,
Dennis and Hein, Maxwell and Hoyer, Kay-Peter and Schaper, Mirko}, year={2023}
}'
chicago: 'Pramanik, Sudipta, Dennis Milaege, Maxwell Hein, Kay-Peter Hoyer, and
Mirko Schaper. “Additive Manufacturing and Mechanical Properties of Auxetic and
Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational
Modelling Approach.” Crystals 13, no. 11 (2023). https://doi.org/10.3390/cryst13111592.'
ieee: 'S. Pramanik, D. Milaege, M. Hein, K.-P. Hoyer, and M. Schaper, “Additive
Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn
Biomedical Stents: A Combined Experimental and Computational Modelling Approach,”
Crystals, vol. 13, no. 11, Art. no. 1592, 2023, doi: 10.3390/cryst13111592.'
mla: 'Pramanik, Sudipta, et al. “Additive Manufacturing and Mechanical Properties
of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental
and Computational Modelling Approach.” Crystals, vol. 13, no. 11, 1592,
MDPI AG, 2023, doi:10.3390/cryst13111592.'
short: S. Pramanik, D. Milaege, M. Hein, K.-P. Hoyer, M. Schaper, Crystals 13 (2023).
date_created: 2023-11-21T15:29:49Z
date_updated: 2023-11-21T15:30:57Z
department:
- _id: '9'
- _id: '158'
doi: 10.3390/cryst13111592
intvolume: ' 13'
issue: '11'
keyword:
- Inorganic Chemistry
- Condensed Matter Physics
- General Materials Science
- General Chemical Engineering
language:
- iso: eng
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: 'Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic
Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling
Approach'
type: journal_article
user_id: '48411'
volume: 13
year: '2023'
...
---
_id: '33484'
abstract:
- lang: eng
text: We study the DC conductivity in potassium titanyl phosphate (KTiOPO4, KTP)
and its isomorphs KTiOAsO4 (KTA) and Rb1%K99%TiOPO4 (RKTP) and introduce a method
by which to reduce the overall ionic conductivity in KTP by a potassium nitrate
treatment. Furthermore, we create so-called gray tracking in KTP and investigate
the ionic conductivity in theses areas. A local unintended reduction of the ionic
conductivity is observed in the gray-tracked regions, which also induce additional
optical absorption in the material. We show that a thermal treatment in an oxygen-rich
atmosphere removes the gray tracking and brings the ionic conductivity as well
as the optical transmission back to the original level. These studies can help
to choose the best material and treatment for specific applications.
author:
- first_name: Laura
full_name: Padberg, Laura
id: '40300'
last_name: Padberg
- first_name: Viktor
full_name: Quiring, Viktor
last_name: Quiring
- first_name: Adriana
full_name: Bocchini, Adriana
id: '58349'
last_name: Bocchini
orcid: 0000-0002-2134-3075
- first_name: Matteo
full_name: Santandrea, Matteo
id: '55095'
last_name: Santandrea
orcid: 0000-0001-5718-358X
- first_name: Uwe
full_name: Gerstmann, Uwe
id: '171'
last_name: Gerstmann
orcid: 0000-0002-4476-223X
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
citation:
ama: 'Padberg L, Quiring V, Bocchini A, et al. DC Ionic Conductivity in KTP and
Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray
Tracking. Crystals. 2022;12:1359. doi:10.3390/cryst12101359'
apa: 'Padberg, L., Quiring, V., Bocchini, A., Santandrea, M., Gerstmann, U., Schmidt,
W. G., Silberhorn, C., & Eigner, C. (2022). DC Ionic Conductivity in KTP and
Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray
Tracking. Crystals, 12, 1359. https://doi.org/10.3390/cryst12101359'
bibtex: '@article{Padberg_Quiring_Bocchini_Santandrea_Gerstmann_Schmidt_Silberhorn_Eigner_2022,
title={DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for
Suppression, and Its Connection to Gray Tracking}, volume={12}, DOI={10.3390/cryst12101359},
journal={Crystals}, author={Padberg, Laura and Quiring, Viktor and Bocchini, Adriana
and Santandrea, Matteo and Gerstmann, Uwe and Schmidt, Wolf Gero and Silberhorn,
Christine and Eigner, Christof}, year={2022}, pages={1359} }'
chicago: 'Padberg, Laura, Viktor Quiring, Adriana Bocchini, Matteo Santandrea, Uwe
Gerstmann, Wolf Gero Schmidt, Christine Silberhorn, and Christof Eigner. “DC Ionic
Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and
Its Connection to Gray Tracking.” Crystals 12 (2022): 1359. https://doi.org/10.3390/cryst12101359.'
ieee: 'L. Padberg et al., “DC Ionic Conductivity in KTP and Its Isomorphs:
Properties, Methods for Suppression, and Its Connection to Gray Tracking,” Crystals,
vol. 12, p. 1359, 2022, doi: 10.3390/cryst12101359.'
mla: 'Padberg, Laura, et al. “DC Ionic Conductivity in KTP and Its Isomorphs: Properties,
Methods for Suppression, and Its Connection to Gray Tracking.” Crystals,
vol. 12, 2022, p. 1359, doi:10.3390/cryst12101359.'
short: L. Padberg, V. Quiring, A. Bocchini, M. Santandrea, U. Gerstmann, W.G. Schmidt,
C. Silberhorn, C. Eigner, Crystals 12 (2022) 1359.
date_created: 2022-09-26T13:12:48Z
date_updated: 2023-04-21T11:07:11Z
department:
- _id: '15'
- _id: '288'
- _id: '623'
- _id: '170'
- _id: '295'
- _id: '230'
- _id: '429'
- _id: '35'
- _id: '790'
doi: 10.3390/cryst12101359
intvolume: ' 12'
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
page: '1359'
project:
- _id: '53'
name: 'TRR 142: TRR 142'
- _id: '55'
name: 'TRR 142 - B: TRR 142 - Project Area B'
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
- _id: '168'
name: 'TRR 142 - B07: TRR 142 - Subproject B07'
- _id: '54'
name: 'TRR 142 - A: TRR 142 - Project Area A'
- _id: '166'
name: 'TRR 142 - A11: TRR 142 - Subproject A11'
publication: Crystals
publication_identifier:
issn:
- 2073-4352
status: public
title: 'DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression,
and Its Connection to Gray Tracking'
type: journal_article
user_id: '171'
volume: 12
year: '2022'
...
---
_id: '41497'
abstract:
- lang: eng
text: In this study, the design, additive manufacturing and experimental
as well as simulation investigation of mechanical and thermal properties of cellular
solids are addressed. For this, two cellular solids having nested and non-nested
structures are designed and additively manufactured via laser powder bed fusion.
The primary objective is to design cellular solids which absorb a significant
amount of energy upon impact loading without transmitting a high amount of stress
into the cellular solids. Therefore, compression testing of the two cellular solids
is performed. The nested and non-nested cellular solids show similar energy absorption
properties; however, the nested cellular solid transmits a lower amount of stress
in the cellular structure compared to the non-nested cellular solid. The experimentally
measured strain (by DIC) in the interior region of the nested cellular solid is
lower despite a higher value of externally imposed compressive strain. The second
objective of this study is to determine the thermal insulation properties of cellular
solids. For measuring the thermal insulation properties, the samples are placed
on a hot plate; and the surface temperature distribution is measured by an infrared
camera. The thermal insulating performance of both cellular types is sufficient
for temperatures exceeding 100 °C. However, the thermal insulating performance
of a non-nested cellular solid is slightly better than that of the nested cellular
solid. Additional thermal simulations predict a relatively higher temperature
distribution on the cellular solid surfaces compared to experimental results.
The simulated residual stress shows a similar distribution for both types, but
the magnitude of residual stress is different for the cellular solids upon cooling
from different temperatures of the hot plate.
article_number: '1217'
author:
- first_name: Sudipta
full_name: Pramanik, Sudipta
last_name: Pramanik
- first_name: Dennis
full_name: Milaege, Dennis
last_name: Milaege
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
id: '48411'
last_name: Hoyer
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: 'Pramanik S, Milaege D, Hoyer K-P, Schaper M. Additively Manufactured Nested
and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation
Applications: An Experimental and Finite Element Analysis Study. Crystals.
2022;12(9). doi:10.3390/cryst12091217'
apa: 'Pramanik, S., Milaege, D., Hoyer, K.-P., & Schaper, M. (2022). Additively
Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution
and Thermal Insulation Applications: An Experimental and Finite Element Analysis
Study. Crystals, 12(9), Article 1217. https://doi.org/10.3390/cryst12091217'
bibtex: '@article{Pramanik_Milaege_Hoyer_Schaper_2022, title={Additively Manufactured
Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal
Insulation Applications: An Experimental and Finite Element Analysis Study}, volume={12},
DOI={10.3390/cryst12091217},
number={91217}, journal={Crystals}, publisher={MDPI AG}, author={Pramanik, Sudipta
and Milaege, Dennis and Hoyer, Kay-Peter and Schaper, Mirko}, year={2022} }'
chicago: 'Pramanik, Sudipta, Dennis Milaege, Kay-Peter Hoyer, and Mirko Schaper.
“Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress
Distribution and Thermal Insulation Applications: An Experimental and Finite Element
Analysis Study.” Crystals 12, no. 9 (2022). https://doi.org/10.3390/cryst12091217.'
ieee: 'S. Pramanik, D. Milaege, K.-P. Hoyer, and M. Schaper, “Additively Manufactured
Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal
Insulation Applications: An Experimental and Finite Element Analysis Study,” Crystals,
vol. 12, no. 9, Art. no. 1217, 2022, doi: 10.3390/cryst12091217.'
mla: 'Pramanik, Sudipta, et al. “Additively Manufactured Nested and Non-Nested Cellular
Solids for Effective Stress Distribution and Thermal Insulation Applications:
An Experimental and Finite Element Analysis Study.” Crystals, vol. 12,
no. 9, 1217, MDPI AG, 2022, doi:10.3390/cryst12091217.'
short: S. Pramanik, D. Milaege, K.-P. Hoyer, M. Schaper, Crystals 12 (2022).
date_created: 2023-02-02T14:27:40Z
date_updated: 2023-04-27T16:45:48Z
department:
- _id: '9'
- _id: '158'
doi: 10.3390/cryst12091217
intvolume: ' 12'
issue: '9'
keyword:
- Inorganic Chemistry
- Condensed Matter Physics
- General Materials Science
- General Chemical Engineering
language:
- iso: eng
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: 'Additively Manufactured Nested and Non-Nested Cellular Solids for Effective
Stress Distribution and Thermal Insulation Applications: An Experimental and Finite
Element Analysis Study'
type: journal_article
user_id: '43720'
volume: 12
year: '2022'
...
---
_id: '41489'
abstract:
- lang: eng
text: In this study, the design, additive manufacturing and experimental
as well as simulation investigation of mechanical and thermal properties of cellular
solids are addressed. For this, two cellular solids having nested and non-nested
structures are designed and additively manufactured via laser powder bed fusion.
The primary objective is to design cellular solids which absorb a significant
amount of energy upon impact loading without transmitting a high amount of stress
into the cellular solids. Therefore, compression testing of the two cellular solids
is performed. The nested and non-nested cellular solids show similar energy absorption
properties; however, the nested cellular solid transmits a lower amount of stress
in the cellular structure compared to the non-nested cellular solid. The experimentally
measured strain (by DIC) in the interior region of the nested cellular solid is
lower despite a higher value of externally imposed compressive strain. The second
objective of this study is to determine the thermal insulation properties of cellular
solids. For measuring the thermal insulation properties, the samples are placed
on a hot plate; and the surface temperature distribution is measured by an infrared
camera. The thermal insulating performance of both cellular types is sufficient
for temperatures exceeding 100 °C. However, the thermal insulating performance
of a non-nested cellular solid is slightly better than that of the nested cellular
solid. Additional thermal simulations predict a relatively higher temperature
distribution on the cellular solid surfaces compared to experimental results.
The simulated residual stress shows a similar distribution for both types, but
the magnitude of residual stress is different for the cellular solids upon cooling
from different temperatures of the hot plate.
article_number: '1217'
author:
- first_name: Sudipta
full_name: Pramanik, Sudipta
last_name: Pramanik
- first_name: Dennis
full_name: Milaege, Dennis
last_name: Milaege
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
last_name: Hoyer
- first_name: Mirko
full_name: Schaper, Mirko
last_name: Schaper
citation:
ama: 'Pramanik S, Milaege D, Hoyer K-P, Schaper M. Additively Manufactured Nested
and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation
Applications: An Experimental and Finite Element Analysis Study. Crystals.
2022;12(9). doi:10.3390/cryst12091217'
apa: 'Pramanik, S., Milaege, D., Hoyer, K.-P., & Schaper, M. (2022). Additively
Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution
and Thermal Insulation Applications: An Experimental and Finite Element Analysis
Study. Crystals, 12(9), Article 1217. https://doi.org/10.3390/cryst12091217'
bibtex: '@article{Pramanik_Milaege_Hoyer_Schaper_2022, title={Additively Manufactured
Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal
Insulation Applications: An Experimental and Finite Element Analysis Study}, volume={12},
DOI={10.3390/cryst12091217},
number={91217}, journal={Crystals}, publisher={MDPI AG}, author={Pramanik, Sudipta
and Milaege, Dennis and Hoyer, Kay-Peter and Schaper, Mirko}, year={2022} }'
chicago: 'Pramanik, Sudipta, Dennis Milaege, Kay-Peter Hoyer, and Mirko Schaper.
“Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress
Distribution and Thermal Insulation Applications: An Experimental and Finite Element
Analysis Study.” Crystals 12, no. 9 (2022). https://doi.org/10.3390/cryst12091217.'
ieee: 'S. Pramanik, D. Milaege, K.-P. Hoyer, and M. Schaper, “Additively Manufactured
Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal
Insulation Applications: An Experimental and Finite Element Analysis Study,” Crystals,
vol. 12, no. 9, Art. no. 1217, 2022, doi: 10.3390/cryst12091217.'
mla: 'Pramanik, Sudipta, et al. “Additively Manufactured Nested and Non-Nested Cellular
Solids for Effective Stress Distribution and Thermal Insulation Applications:
An Experimental and Finite Element Analysis Study.” Crystals, vol. 12,
no. 9, 1217, MDPI AG, 2022, doi:10.3390/cryst12091217.'
short: S. Pramanik, D. Milaege, K.-P. Hoyer, M. Schaper, Crystals 12 (2022).
date_created: 2023-02-02T14:22:59Z
date_updated: 2023-04-27T16:48:04Z
department:
- _id: '9'
- _id: '158'
doi: 10.3390/cryst12091217
intvolume: ' 12'
issue: '9'
keyword:
- Inorganic Chemistry
- Condensed Matter Physics
- General Materials Science
- General Chemical Engineering
language:
- iso: eng
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
status: public
title: 'Additively Manufactured Nested and Non-Nested Cellular Solids for Effective
Stress Distribution and Thermal Insulation Applications: An Experimental and Finite
Element Analysis Study'
type: journal_article
user_id: '48411'
volume: 12
year: '2022'
...
---
_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: '47963'
abstract:
- lang: eng
text: Nonlinear and quantum optical devices based on periodically-poled thin film
lithium niobate (PP-TFLN) have gained considerable interest lately, due to their
significantly improved performance as compared to their bulk counterparts. Nevertheless,
performance parameters such as conversion efficiency, minimum pump power, and
spectral bandwidth strongly depend on the quality of the domain structure in these
PP-TFLN samples, e.g., their homogeneity and duty cycle, as well as on the overlap
and penetration depth of domains with the waveguide mode. Hence, in order to propose
improved fabrication protocols, a profound quality control of domain structures
is needed that allows quantifying and thoroughly analyzing these parameters. In
this paper, we propose to combine a set of nanometer-to-micrometer-scale imaging
techniques, i.e., piezoresponse force microscopy (PFM), second-harmonic generation
(SHG), and Raman spectroscopy (RS), to access the relevant and crucial sample
properties through cross-correlating these methods. Based on our findings, we
designate SHG to be the best-suited standard imaging technique for this purpose,
in particular when investigating the domain poling process in x-cut TFLNs. While
PFM is excellently recommended for near-surface high-resolution imaging, RS provides
thorough insights into stress and/or defect distributions, as associated with
these domain structures. In this context, our work here indicates unexpectedly
large signs for internal fields occurring in x-cut PP-TFLNs that are substantially
larger as compared to previous observations in bulk LN.
article_number: '288'
article_type: original
author:
- first_name: Sven
full_name: Reitzig, Sven
last_name: Reitzig
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Jie
full_name: Zhao, Jie
last_name: Zhao
- first_name: Benjamin
full_name: Kirbus, Benjamin
last_name: Kirbus
- first_name: Shayan
full_name: Mookherjea, Shayan
last_name: Mookherjea
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
citation:
ama: Reitzig S, Rüsing M, Zhao J, Kirbus B, Mookherjea S, Eng LM. “Seeing Is Believing”—In-Depth
Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films.
Crystals. 2021;11(3). doi:10.3390/cryst11030288
apa: Reitzig, S., Rüsing, M., Zhao, J., Kirbus, B., Mookherjea, S., & Eng, L.
M. (2021). “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled
X-Cut Lithium Niobate Thin Films. Crystals, 11(3), Article 288.
https://doi.org/10.3390/cryst11030288
bibtex: '@article{Reitzig_Rüsing_Zhao_Kirbus_Mookherjea_Eng_2021, title={“Seeing
Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium
Niobate Thin Films}, volume={11}, DOI={10.3390/cryst11030288},
number={3288}, journal={Crystals}, publisher={MDPI AG}, author={Reitzig, Sven
and Rüsing, Michael and Zhao, Jie and Kirbus, Benjamin and Mookherjea, Shayan
and Eng, Lukas M.}, year={2021} }'
chicago: Reitzig, Sven, Michael Rüsing, Jie Zhao, Benjamin Kirbus, Shayan Mookherjea,
and Lukas M. Eng. “‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging of Periodically-Poled
X-Cut Lithium Niobate Thin Films.” Crystals 11, no. 3 (2021). https://doi.org/10.3390/cryst11030288.
ieee: 'S. Reitzig, M. Rüsing, J. Zhao, B. Kirbus, S. Mookherjea, and L. M. Eng,
“‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut
Lithium Niobate Thin Films,” Crystals, vol. 11, no. 3, Art. no. 288, 2021,
doi: 10.3390/cryst11030288.'
mla: Reitzig, Sven, et al. “‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging
of Periodically-Poled X-Cut Lithium Niobate Thin Films.” Crystals, vol.
11, no. 3, 288, MDPI AG, 2021, doi:10.3390/cryst11030288.
short: S. Reitzig, M. Rüsing, J. Zhao, B. Kirbus, S. Mookherjea, L.M. Eng, Crystals
11 (2021).
date_created: 2023-10-11T08:19:51Z
date_updated: 2023-10-11T08:20:25Z
doi: 10.3390/cryst11030288
extern: '1'
intvolume: ' 11'
issue: '3'
keyword:
- Inorganic Chemistry
- Condensed Matter Physics
- General Materials Science
- General Chemical Engineering
language:
- iso: eng
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled
X-Cut Lithium Niobate Thin Films
type: journal_article
user_id: '22501'
volume: 11
year: '2021'
...
---
_id: '47964'
abstract:
- lang: eng
text: In the last two decades, variably doped strontium barium niobate (SBN) has
attracted a lot of scientific interest mainly due to its specific non-linear optical
response. Comparably, the parental compound, i.e., undoped SBN, appears to be
less studied so far. Here, two different cuts of single-crystalline nominally
pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are
comprehensively studied and analyzed with regard to their photoconductive responses.
We present conductance measurements under systematically varied illumination conditions
along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced
photoconductance (PC) already under daylight and a large effect upon super-bandgap
illumination in general, we observe (i) distinct spectral features when sweeping
the excitation wavelength over the sub-bandgap region as then discussed in the
context of deep and shallow trap states, (ii) extremely slow long-term relaxation
for both light-on and light-off transients in the range of hours and days, (iii)
a critical dependence of the photoresponse on the pre-illumination history of
the sample, and (iv) a current–voltage hysteresis depending on both the illumination
and the electrical-measurement conditions in a complex manner.
article_number: '780'
article_type: original
author:
- first_name: Elke
full_name: Beyreuther, Elke
last_name: Beyreuther
- first_name: Julius
full_name: Ratzenberger, Julius
last_name: Ratzenberger
- first_name: Matthias
full_name: Roeper, Matthias
last_name: Roeper
- first_name: Benjamin
full_name: Kirbus, Benjamin
last_name: Kirbus
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Liudmila I.
full_name: Ivleva, Liudmila I.
last_name: Ivleva
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
citation:
ama: Beyreuther E, Ratzenberger J, Roeper M, et al. Photoconduction of Polar and
Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals. Crystals. 2021;11(7).
doi:10.3390/cryst11070780
apa: Beyreuther, E., Ratzenberger, J., Roeper, M., Kirbus, B., Rüsing, M., Ivleva,
L. I., & Eng, L. M. (2021). Photoconduction of Polar and Nonpolar Cuts of
Undoped Sr0.61Ba0.39Nb2O6 Single Crystals. Crystals, 11(7), Article
780. https://doi.org/10.3390/cryst11070780
bibtex: '@article{Beyreuther_Ratzenberger_Roeper_Kirbus_Rüsing_Ivleva_Eng_2021,
title={Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6
Single Crystals}, volume={11}, DOI={10.3390/cryst11070780},
number={7780}, journal={Crystals}, publisher={MDPI AG}, author={Beyreuther, Elke
and Ratzenberger, Julius and Roeper, Matthias and Kirbus, Benjamin and Rüsing,
Michael and Ivleva, Liudmila I. and Eng, Lukas M.}, year={2021} }'
chicago: Beyreuther, Elke, Julius Ratzenberger, Matthias Roeper, Benjamin Kirbus,
Michael Rüsing, Liudmila I. Ivleva, and Lukas M. Eng. “Photoconduction of Polar
and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals.” Crystals
11, no. 7 (2021). https://doi.org/10.3390/cryst11070780.
ieee: 'E. Beyreuther et al., “Photoconduction of Polar and Nonpolar Cuts
of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals,” Crystals, vol. 11, no. 7,
Art. no. 780, 2021, doi: 10.3390/cryst11070780.'
mla: Beyreuther, Elke, et al. “Photoconduction of Polar and Nonpolar Cuts of Undoped
Sr0.61Ba0.39Nb2O6 Single Crystals.” Crystals, vol. 11, no. 7, 780, MDPI
AG, 2021, doi:10.3390/cryst11070780.
short: E. Beyreuther, J. Ratzenberger, M. Roeper, B. Kirbus, M. Rüsing, L.I. Ivleva,
L.M. Eng, Crystals 11 (2021).
date_created: 2023-10-11T08:20:40Z
date_updated: 2023-10-11T08:21:17Z
doi: 10.3390/cryst11070780
extern: '1'
funded_apc: '1'
intvolume: ' 11'
issue: '7'
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/cryst11070780
oa: '1'
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single
Crystals
type: journal_article
user_id: '22501'
volume: 11
year: '2021'
...
---
_id: '13650'
abstract:
- lang: eng
text: Surfaces covered with layers of ultrathin nanoantenna structures—so
called metasurfaces have recently been proven capable of completely controlling
phase of light. Metalenses have emerged from the advance in the development of
metasurfaces providing a new basis for recasting traditional lenses into thin,
planar optical components capable of focusing light. The lens made of arrays of
plasmonic gold nanorods were fabricated on a glass substrate by using electron
beam lithography. A 1064 nm laser was used to create a high intensity circularly
polarized light focal spot through metalens of focal length 800 µm, N.A. = 0.6
fabricated based on Pancharatnam-Berry phase principle. We demonstrated that optical
rotation of birefringent nematic liquid crystal droplets trapped in the laser
beam was possible through this metalens. The rotation of birefringent droplets
convinced that the optical trap possesses strong enough angular momentum of light
from radiation of each nanostructure acting like a local half waveplate and introducing
an orientation-dependent phase to light. Here, we show the success in creating
a miniaturized and robust metalens based optical tweezers system capable of rotating
liquid crystals droplets to imitate an optical motor for future lab-on-a-chip
applications.
author:
- first_name: Satayu
full_name: Suwannasopon, Satayu
last_name: Suwannasopon
- first_name: Fabian
full_name: Meyer, Fabian
last_name: Meyer
- first_name: Christian
full_name: Schlickriede, Christian
id: '59792'
last_name: Schlickriede
- first_name: Papichaya
full_name: Chaisakul, Papichaya
last_name: Chaisakul
- first_name: Jiraroj
full_name: T-Thienprasert, Jiraroj
last_name: T-Thienprasert
- first_name: Jumras
full_name: Limtrakul, Jumras
last_name: Limtrakul
- first_name: Thomas
full_name: Zentgraf, Thomas
id: '30525'
last_name: Zentgraf
orcid: 0000-0002-8662-1101
- first_name: Nattaporn
full_name: Chattham, Nattaporn
last_name: Chattham
citation:
ama: Suwannasopon S, Meyer F, Schlickriede C, et al. Miniaturized Metalens Based
Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors.
Crystals. 2019;9(10):515. doi:10.3390/cryst9100515
apa: Suwannasopon, S., Meyer, F., Schlickriede, C., Chaisakul, P., T-Thienprasert,
J., Limtrakul, J., … Chattham, N. (2019). Miniaturized Metalens Based Optical
Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors. Crystals,
9(10), 515. https://doi.org/10.3390/cryst9100515
bibtex: '@article{Suwannasopon_Meyer_Schlickriede_Chaisakul_T-Thienprasert_Limtrakul_Zentgraf_Chattham_2019,
title={Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets
for Lab-on-a-Chip Optical Motors}, volume={9}, DOI={10.3390/cryst9100515},
number={10}, journal={Crystals}, author={Suwannasopon, Satayu and Meyer, Fabian
and Schlickriede, Christian and Chaisakul, Papichaya and T-Thienprasert, Jiraroj
and Limtrakul, Jumras and Zentgraf, Thomas and Chattham, Nattaporn}, year={2019},
pages={515} }'
chicago: 'Suwannasopon, Satayu, Fabian Meyer, Christian Schlickriede, Papichaya
Chaisakul, Jiraroj T-Thienprasert, Jumras Limtrakul, Thomas Zentgraf, and Nattaporn
Chattham. “Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets
for Lab-on-a-Chip Optical Motors.” Crystals 9, no. 10 (2019): 515. https://doi.org/10.3390/cryst9100515.'
ieee: S. Suwannasopon et al., “Miniaturized Metalens Based Optical Tweezers
on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors,” Crystals,
vol. 9, no. 10, p. 515, 2019.
mla: Suwannasopon, Satayu, et al. “Miniaturized Metalens Based Optical Tweezers
on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors.” Crystals,
vol. 9, no. 10, 2019, p. 515, doi:10.3390/cryst9100515.
short: S. Suwannasopon, F. Meyer, C. Schlickriede, P. Chaisakul, J. T-Thienprasert,
J. Limtrakul, T. Zentgraf, N. Chattham, Crystals 9 (2019) 515.
date_created: 2019-10-08T06:25:52Z
date_updated: 2022-01-06T06:51:41Z
department:
- _id: '15'
- _id: '230'
- _id: '289'
doi: 10.3390/cryst9100515
intvolume: ' 9'
issue: '10'
language:
- iso: eng
page: '515'
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
status: public
title: Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for
Lab-on-a-Chip Optical Motors
type: journal_article
user_id: '30525'
volume: 9
year: '2019'
...