---
_id: '63072'
abstract:
- lang: eng
text: Titanium alloys are widely employed for biomedical implants due to
their high strength, biocompatibility, and corrosion resistance, yet their lack
of intrinsic antibacterial activity remains a major limitation. Incorporating
copper, an antibacterial and β-stabilising element, offers a promising strategy
to enhance implant performance. This study investigates Ti-6Al-7Nb modified with
1–9 wt.% Cu via in situ alloying during metal-based laser powder bed fusion (PBF-LB/M),
with the aim of assessing processability, microstructural evolution, and mechanical
properties. Highly dense samples (>99.9%) were produced across all Cu levels,
though chemical homogeneity strongly depended on processing parameters. Increasing
Cu content promoted β-phase stabilisation, Ti2Cu precipitation, and pronounced
grain refinement. Hardness and yield strength increased nearly linearly with Cu
addition, while ductility decreased sharply at ≥5 wt.% Cu due to intermetallic
formation, hot cracking, and brittle fracture. These results illustrate both the
opportunities and constraints of rapid alloy screening via PBF-LB/M. Overall,
moderate Cu additions of 1–3 wt.% provide the most favourable balance between
mechanical performance, manufacturability, and potential antibacterial functionality.
These findings provide a clear guideline for the design of Cu-functionalised titanium
implants and demonstrate the efficiency of in situ alloy screening for accelerated
materials development.
article_number: '1053'
article_type: original
author:
- first_name: Paul
full_name: Steinmeier, Paul
last_name: Steinmeier
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
last_name: Hoyer
- first_name: Nelson Filipe
full_name: Lopes Dias, Nelson Filipe
last_name: Lopes Dias
- first_name: Reiner
full_name: Zielke, Reiner
last_name: Zielke
- first_name: Wolfgang
full_name: Tillmann, Wolfgang
last_name: Tillmann
- first_name: Mirko
full_name: Schaper, Mirko
last_name: Schaper
citation:
ama: Steinmeier P, Hoyer K-P, Lopes Dias NF, Zielke R, Tillmann W, Schaper M. In
Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion. Crystals.
2025;15(12). doi:10.3390/cryst15121053
apa: Steinmeier, P., Hoyer, K.-P., Lopes Dias, N. F., Zielke, R., Tillmann, W.,
& Schaper, M. (2025). In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser
Powder Bed Fusion. Crystals, 15(12), Article 1053. https://doi.org/10.3390/cryst15121053
bibtex: '@article{Steinmeier_Hoyer_Lopes Dias_Zielke_Tillmann_Schaper_2025, title={In
Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion}, volume={15},
DOI={10.3390/cryst15121053},
number={121053}, journal={Crystals}, publisher={MDPI AG}, author={Steinmeier,
Paul and Hoyer, Kay-Peter and Lopes Dias, Nelson Filipe and Zielke, Reiner and
Tillmann, Wolfgang and Schaper, Mirko}, year={2025} }'
chicago: Steinmeier, Paul, Kay-Peter Hoyer, Nelson Filipe Lopes Dias, Reiner Zielke,
Wolfgang Tillmann, and Mirko Schaper. “In Situ Alloying of Ti-6Al-7Nb with Copper
Using Laser Powder Bed Fusion.” Crystals 15, no. 12 (2025). https://doi.org/10.3390/cryst15121053.
ieee: 'P. Steinmeier, K.-P. Hoyer, N. F. Lopes Dias, R. Zielke, W. Tillmann, and
M. Schaper, “In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed
Fusion,” Crystals, vol. 15, no. 12, Art. no. 1053, 2025, doi: 10.3390/cryst15121053.'
mla: Steinmeier, Paul, et al. “In Situ Alloying of Ti-6Al-7Nb with Copper Using
Laser Powder Bed Fusion.” Crystals, vol. 15, no. 12, 1053, MDPI AG, 2025,
doi:10.3390/cryst15121053.
short: P. Steinmeier, K.-P. Hoyer, N.F. Lopes Dias, R. Zielke, W. Tillmann, M. Schaper,
Crystals 15 (2025).
date_created: 2025-12-12T13:11:59Z
date_updated: 2025-12-12T14:02:13Z
ddc:
- '620'
department:
- _id: '158'
- _id: '321'
doi: 10.3390/cryst15121053
file:
- access_level: closed
content_type: application/pdf
creator: paulstei
date_created: 2025-12-12T13:12:33Z
date_updated: 2025-12-12T13:12:33Z
file_id: '63073'
file_name: crystals-15-01053.pdf
file_size: 20716652
relation: main_file
success: 1
file_date_updated: 2025-12-12T13:12:33Z
funded_apc: '1'
has_accepted_license: '1'
intvolume: ' 15'
issue: '12'
keyword:
- Biomaterial
- In Situ Alloying
- Titanium
- Additive Manufacturing
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3390/cryst15121053
oa: '1'
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion
type: journal_article
user_id: '69776'
volume: 15
year: '2025'
...
---
_id: '65669'
abstract:
- lang: eng
text: Local droplet etching and subsequent refilling enables the fabrication
of highly symmetric quantum dots with low fine structure splitting, suitable for
generating polarization entangled photons. While well established in GaAs/AlxGa1−xAs,
this approach does not yield emission in the telecom bands required for low loss
fiber-based quantum communication. To achieve emission at 1.55 μm, local droplet
etching must be adapted to alternative material platforms such as InP. Here, we
systematically investigate how the etching material deposition rate and etching
time influence nanohole morphology in In0.52Al0.48As layers lattice-matched to
InP. In the first experiment, InAl was deposited at fluxes of 0.2–4.0 Å s−1 at
Tetch = 350 °C and 460 °C. Lower fluxes produced nanoholes with lower density
and larger ring diameters, indicating fewer and larger initial droplets, consistent
with scaling theory. The average nanohole diameter decreased monotonically with
increasing flux, whereas the average depth showed no clear dependence on flux.
In the second experiment, etching times of 30–600 s were tested for InAl, In,
and Al droplets. Average nanohole diameters remained constant for Al across all
etching times, but decreased for In and InAl with increasing etching time, suggesting
sidewall redeposition during etching. For all droplet types, depths peaked at
intermediate times and decreased for prolonged etching, consistent with material
diffusion into the nanohole after droplet consumption.
article_number: '913'
author:
- first_name: Dennis
full_name: Deutsch, Dennis
id: '23489'
last_name: Deutsch
- first_name: Dirk
full_name: Reuter, Dirk
id: '37763'
last_name: Reuter
citation:
ama: Deutsch D, Reuter D. Influence of the Etching Material Deposition Rate and
Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As Layers via
Local Droplet Epitaxy. Crystals. 2025;15(11). doi:10.3390/cryst15110913
apa: Deutsch, D., & Reuter, D. (2025). Influence of the Etching Material Deposition
Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As
Layers via Local Droplet Epitaxy. Crystals, 15(11), Article 913.
https://doi.org/10.3390/cryst15110913
bibtex: '@article{Deutsch_Reuter_2025, title={Influence of the Etching Material
Deposition Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As
Layers via Local Droplet Epitaxy}, volume={15}, DOI={10.3390/cryst15110913},
number={11913}, journal={Crystals}, publisher={MDPI AG}, author={Deutsch, Dennis
and Reuter, Dirk}, year={2025} }'
chicago: Deutsch, Dennis, and Dirk Reuter. “Influence of the Etching Material Deposition
Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As
Layers via Local Droplet Epitaxy.” Crystals 15, no. 11 (2025). https://doi.org/10.3390/cryst15110913.
ieee: 'D. Deutsch and D. Reuter, “Influence of the Etching Material Deposition Rate
and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As Layers
via Local Droplet Epitaxy,” Crystals, vol. 15, no. 11, Art. no. 913, 2025,
doi: 10.3390/cryst15110913.'
mla: Deutsch, Dennis, and Dirk Reuter. “Influence of the Etching Material Deposition
Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As
Layers via Local Droplet Epitaxy.” Crystals, vol. 15, no. 11, 913, MDPI
AG, 2025, doi:10.3390/cryst15110913.
short: D. Deutsch, D. Reuter, Crystals 15 (2025).
date_created: 2026-05-21T06:35:35Z
date_updated: 2026-05-21T06:36:29Z
department:
- _id: '15'
- _id: '230'
doi: 10.3390/cryst15110913
intvolume: ' 15'
issue: '11'
language:
- iso: eng
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
status: public
title: Influence of the Etching Material Deposition Rate and Annealing Time on Nanohole
Morphology Etched into InP/In0.52Al0.48As Layers via Local Droplet Epitaxy
type: journal_article
user_id: '42514'
volume: 15
year: '2025'
...
---
_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: '57467'
abstract:
- lang: eng
text: Additive manufacturing of metallic components often results in the
formation of columnar grain structures aligned along the build direction. These
elongated grains can introduce anisotropy, negatively impacting the mechanical
properties of the components. This study aimed to achieve controlled solidification
with a fine-grained microstructure to enhance the mechanical performance of printed
parts. Stainless steel 316L was used as the test material. High-intensity ultrasound
was applied during the direct energy deposition (DED) process to inhibit the formation
of columnar grains. The investigation emphasized the importance of amplitude changes
of the ultrasound wave as the system’s geometry continuously evolves with the
addition of multiple layers and assessed how these changes influence the grain
size and distribution. Initial tests revealed significant amplitude fluctuations
during layer deposition, highlighting the impact of layer deposition on process
uniformity. The mechanical results demonstrated that the application of ultrasound
effectively refined the grain structure, leading to a 15% increase in tensile
strength compared to conventionally additively manufactured samples.
article_number: '1001'
author:
- 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: Philipp
full_name: Pabel, Philipp
id: '67374'
last_name: Pabel
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Stefan
full_name: Gnaase, Stefan
id: '25730'
last_name: Gnaase
- first_name: David
full_name: Kostka, David
last_name: Kostka
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
citation:
ama: Lehnert D, Bödger C, Pabel P, et al. The Influence of Ultrasonic Irradiation
of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced
Component. Crystals. 2024;14(11). doi:10.3390/cryst14111001
apa: Lehnert, D., Bödger, C., Pabel, P., Scheidemann, C., Hemsel, T., Gnaase, S.,
Kostka, D., & Tröster, T. (2024). The Influence of Ultrasonic Irradiation
of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced
Component. Crystals, 14(11), Article 1001. https://doi.org/10.3390/cryst14111001
bibtex: '@article{Lehnert_Bödger_Pabel_Scheidemann_Hemsel_Gnaase_Kostka_Tröster_2024,
title={The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by
DED on the Mechanical Properties of the Produced Component}, volume={14}, DOI={10.3390/cryst14111001}, number={111001},
journal={Crystals}, publisher={MDPI AG}, author={Lehnert, Dennis and Bödger, Christian
and Pabel, Philipp and Scheidemann, Claus and Hemsel, Tobias and Gnaase, Stefan
and Kostka, David and Tröster, Thomas}, year={2024} }'
chicago: Lehnert, Dennis, Christian Bödger, Philipp Pabel, Claus Scheidemann, Tobias
Hemsel, Stefan Gnaase, David Kostka, and Thomas Tröster. “The Influence of Ultrasonic
Irradiation of a 316L Weld Pool Produced by DED on the Mechanical Properties of
the Produced Component.” Crystals 14, no. 11 (2024). https://doi.org/10.3390/cryst14111001.
ieee: 'D. Lehnert et al., “The Influence of Ultrasonic Irradiation of a 316L
Weld Pool Produced by DED on the Mechanical Properties of the Produced Component,”
Crystals, vol. 14, no. 11, Art. no. 1001, 2024, doi: 10.3390/cryst14111001.'
mla: Lehnert, Dennis, et al. “The Influence of Ultrasonic Irradiation of a 316L
Weld Pool Produced by DED on the Mechanical Properties of the Produced Component.”
Crystals, vol. 14, no. 11, 1001, MDPI AG, 2024, doi:10.3390/cryst14111001.
short: D. Lehnert, C. Bödger, P. Pabel, C. Scheidemann, T. Hemsel, S. Gnaase, D.
Kostka, T. Tröster, Crystals 14 (2024).
date_created: 2024-11-28T08:45:06Z
date_updated: 2026-02-23T08:07:37Z
ddc:
- '670'
department:
- _id: '149'
- _id: '321'
- _id: '9'
doi: 10.3390/cryst14111001
file:
- access_level: closed
content_type: application/pdf
creator: dlehnert
date_created: 2024-11-28T08:52:48Z
date_updated: 2024-11-28T08:52:48Z
file_id: '57470'
file_name: crystals-14-01001-v2 (4).pdf
file_size: 5779744
relation: main_file
success: 1
file_date_updated: 2024-11-28T08:52:48Z
has_accepted_license: '1'
intvolume: ' 14'
issue: '11'
language:
- iso: eng
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by DED
on the Mechanical Properties of the Produced Component
type: journal_article
user_id: '93904'
volume: 14
year: '2024'
...
---
_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: '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: '54854'
abstract:
- lang: eng
text: 'Batteries based on heavier alkali ions are considered promising candidates
to substitute for current Li-based technologies. In this theoretical study, we
characterize the structural properties of a novel material, i.e., F-doped RbTiOPO4
(RbTiPO4F, RTP:F), and discuss aspects of its electrochemical performance in Rb-ion
batteries (RIBs) using density functional theory (DFT). According to our calculations,
RTP:F is expected to retain the so-called KTiOPO4 (KTP)-type structure, with lattice
parameters of 13.236 Å, 6.616 Å, and 10.945 Å. Due to the doping with F, the crystal
features eight extra electrons per unit cell, whereby each of these electrons
is trapped by one of the surrounding Ti atoms in the cell. Notably, the ground
state of the system corresponds to a ferromagnetic spin configuration (i.e., S=4).
The deintercalation of Rb leads to the oxidation of the Ti atoms in the cell (i.e.,
from Ti3+ to Ti4+) and to reduced magnetic moments. The material promises interesting
electrochemical properties for the cathode: rather high average voltages above
2.8 V and modest volume shrinkages below 13% even in the fully deintercalated
case are predicted.'
article_number: '5'
author:
- first_name: Adriana
full_name: Bocchini, Adriana
id: '58349'
last_name: Bocchini
orcid: 0000-0002-2134-3075
- first_name: Yingjie
full_name: Xie, Yingjie
last_name: Xie
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Uwe
full_name: Gerstmann, Uwe
id: '171'
last_name: Gerstmann
orcid: 0000-0002-4476-223X
citation:
ama: Bocchini A, Xie Y, Schmidt WG, Gerstmann U. Structural and Electrochemical
Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles. Crystals.
2023;14(1). doi:10.3390/cryst14010005
apa: Bocchini, A., Xie, Y., Schmidt, W. G., & Gerstmann, U. (2023). Structural
and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First
Principles. Crystals, 14(1), Article 5. https://doi.org/10.3390/cryst14010005
bibtex: '@article{Bocchini_Xie_Schmidt_Gerstmann_2023, title={Structural and Electrochemical
Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles}, volume={14},
DOI={10.3390/cryst14010005},
number={15}, journal={Crystals}, publisher={MDPI AG}, author={Bocchini, Adriana
and Xie, Yingjie and Schmidt, Wolf Gero and Gerstmann, Uwe}, year={2023} }'
chicago: Bocchini, Adriana, Yingjie Xie, Wolf Gero Schmidt, and Uwe Gerstmann. “Structural
and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First
Principles.” Crystals 14, no. 1 (2023). https://doi.org/10.3390/cryst14010005.
ieee: 'A. Bocchini, Y. Xie, W. G. Schmidt, and U. Gerstmann, “Structural and Electrochemical
Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles,” Crystals,
vol. 14, no. 1, Art. no. 5, 2023, doi: 10.3390/cryst14010005.'
mla: Bocchini, Adriana, et al. “Structural and Electrochemical Properties of F-Doped
RbTiOPO4 (RTP:F) Predicted from First Principles.” Crystals, vol. 14, no.
1, 5, MDPI AG, 2023, doi:10.3390/cryst14010005.
short: A. Bocchini, Y. Xie, W.G. Schmidt, U. Gerstmann, Crystals 14 (2023).
date_created: 2024-06-24T06:21:04Z
date_updated: 2024-06-24T06:30:13Z
department:
- _id: '15'
- _id: '170'
- _id: '295'
- _id: '790'
- _id: '230'
- _id: '429'
- _id: '27'
doi: 10.3390/cryst14010005
intvolume: ' 14'
issue: '1'
language:
- iso: eng
project:
- _id: '53'
grant_number: '231447078'
name: 'TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden
Konzepten zu funktionellen Strukturen'
- _id: '54'
name: 'TRR 142 - A: TRR 142 - Project Area A'
- _id: '55'
name: 'TRR 142 - B: TRR 142 - Project Area B'
- _id: '166'
name: 'TRR 142 - A11: TRR 142 - Subproject A11'
- _id: '168'
grant_number: '231447078'
name: 'TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften
von Lithiumniobat (B07*)'
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
status: public
title: Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted
from First Principles
type: journal_article
user_id: '16199'
volume: 14
year: '2023'
...
---
_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: 2025-03-18T12:45:57Z
ddc:
- '670'
department:
- _id: '149'
- _id: '9'
- _id: '321'
doi: 10.3390/cryst13020157
file:
- access_level: closed
content_type: application/pdf
creator: cboedger
date_created: 2024-11-22T15:55:07Z
date_updated: 2024-11-22T15:55:07Z
file_id: '57334'
file_name: crystals-13-00157.pdf
file_size: 5838834
relation: main_file
success: 1
file_date_updated: 2024-11-22T15:55:07Z
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: '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'
...