---
_id: '49609'
abstract:
- lang: eng
text: The alignment of liquid crystals on surfaces plays a central role
in optimizing their performances. In this work, a cutting-edge nano-lithography-based
method to control the local orientation of a thermotropic liquid crystal is applied
to easily available commercial standard materials and evaluated. Parallel nanogrooves
on a substrate, created through 3D nanoprinting in a negative-tone photoresin
optimized for two-photon polymerization are used for this purpose. Azimuthal anchoring
energies of the order from 10−6 J/m2
to 10−5 J/m2 are found, depending on
the spacing, width and depth of the grooves. In part, these values are larger
than those reported previously for another photopolymer. Both uniform alignment
and spatial patterns of different alignment directions can be realized. Electro-optic
studies confirm the suitability of the method for electrically addressable photonic
applications and indicate strong polar anchoring.
article_number: '3467'
author:
- first_name: Bingru
full_name: Zhang, Bingru
last_name: Zhang
- first_name: Malte
full_name: Plidschun, Malte
last_name: Plidschun
- first_name: Markus A.
full_name: Schmidt, Markus A.
last_name: Schmidt
- first_name: Heinz-Siegfried
full_name: Kitzerow, Heinz-Siegfried
id: '254'
last_name: Kitzerow
citation:
ama: Zhang B, Plidschun M, Schmidt MA, Kitzerow H-S. Anchoring and electro-optic
switching of liquid crystals on nano-structured surfaces fabricated by two-photon
based nano-printing. Optical Materials Express. 2023;13(12). doi:10.1364/ome.503100
apa: Zhang, B., Plidschun, M., Schmidt, M. A., & Kitzerow, H.-S. (2023). Anchoring
and electro-optic switching of liquid crystals on nano-structured surfaces fabricated
by two-photon based nano-printing. Optical Materials Express, 13(12),
Article 3467. https://doi.org/10.1364/ome.503100
bibtex: '@article{Zhang_Plidschun_Schmidt_Kitzerow_2023, title={Anchoring and electro-optic
switching of liquid crystals on nano-structured surfaces fabricated by two-photon
based nano-printing}, volume={13}, DOI={10.1364/ome.503100},
number={123467}, journal={Optical Materials Express}, publisher={Optica Publishing
Group}, author={Zhang, Bingru and Plidschun, Malte and Schmidt, Markus A. and
Kitzerow, Heinz-Siegfried}, year={2023} }'
chicago: Zhang, Bingru, Malte Plidschun, Markus A. Schmidt, and Heinz-Siegfried
Kitzerow. “Anchoring and Electro-Optic Switching of Liquid Crystals on Nano-Structured
Surfaces Fabricated by Two-Photon Based Nano-Printing.” Optical Materials Express
13, no. 12 (2023). https://doi.org/10.1364/ome.503100.
ieee: 'B. Zhang, M. Plidschun, M. A. Schmidt, and H.-S. Kitzerow, “Anchoring and
electro-optic switching of liquid crystals on nano-structured surfaces fabricated
by two-photon based nano-printing,” Optical Materials Express, vol. 13,
no. 12, Art. no. 3467, 2023, doi: 10.1364/ome.503100.'
mla: Zhang, Bingru, et al. “Anchoring and Electro-Optic Switching of Liquid Crystals
on Nano-Structured Surfaces Fabricated by Two-Photon Based Nano-Printing.” Optical
Materials Express, vol. 13, no. 12, 3467, Optica Publishing Group, 2023, doi:10.1364/ome.503100.
short: B. Zhang, M. Plidschun, M.A. Schmidt, H.-S. Kitzerow, Optical Materials Express
13 (2023).
date_created: 2023-12-13T15:59:37Z
date_updated: 2023-12-13T16:06:29Z
department:
- _id: '313'
- _id: '230'
- _id: '35'
doi: 10.1364/ome.503100
intvolume: ' 13'
issue: '12'
keyword:
- Electronic
- Optical and Magnetic Materials
language:
- iso: eng
publication: Optical Materials Express
publication_identifier:
issn:
- 2159-3930
publication_status: published
publisher: Optica Publishing Group
status: public
title: Anchoring and electro-optic switching of liquid crystals on nano-structured
surfaces fabricated by two-photon based nano-printing
type: journal_article
user_id: '254'
volume: 13
year: '2023'
...
---
_id: '61266'
abstract:
- lang: eng
text: This review examines the use of continuous-variable spectroscopy techniques
for investigating quantum coherence and light-matter interactions in semiconductor
systems with ultrafast dynamics. Special emphasis is placed on multichannel homodyne
detection as a powerful tool to measure the quantum coherence and the full density
matrix of a polariton system. Observations, such as coherence times that exceed
the nanosecond scale obtained by monitoring the temporal decay of quantum coherence
in a polariton condensate, are discussed. Proof-of-concept experiments and numerical
simulations that demonstrate the enhanced resourcefulness of the produced system
states for modern quantum protocols are assessed. The combination of tailored
resource quantifiers and ultrafast spectroscopy techniques that have recently
been demonstrated paves the way for future applications of quantum information
technologies.
article_number: '2997'
author:
- first_name: Carolin
full_name: Lüders, Carolin
last_name: Lüders
- first_name: Franziska
full_name: Barkhausen, Franziska
id: '63631'
last_name: Barkhausen
- first_name: Matthias
full_name: Pukrop, Matthias
last_name: Pukrop
- first_name: Elena
full_name: Rozas, Elena
last_name: Rozas
- first_name: Jan
full_name: Sperling, Jan
id: '75127'
last_name: Sperling
orcid: 0000-0002-5844-3205
- first_name: Stefan
full_name: Schumacher, Stefan
id: '27271'
last_name: Schumacher
orcid: 0000-0003-4042-4951
- first_name: Marc
full_name: Aßmann, Marc
last_name: Aßmann
citation:
ama: Lüders C, Barkhausen F, Pukrop M, et al. Continuous-variable quantum optics
and resource theory for ultrafast semiconductor spectroscopy [Invited]. Optical
Materials Express. 2023;13(11). doi:10.1364/ome.497006
apa: Lüders, C., Barkhausen, F., Pukrop, M., Rozas, E., Sperling, J., Schumacher,
S., & Aßmann, M. (2023). Continuous-variable quantum optics and resource theory
for ultrafast semiconductor spectroscopy [Invited]. Optical Materials Express,
13(11), Article 2997. https://doi.org/10.1364/ome.497006
bibtex: '@article{Lüders_Barkhausen_Pukrop_Rozas_Sperling_Schumacher_Aßmann_2023,
title={Continuous-variable quantum optics and resource theory for ultrafast semiconductor
spectroscopy [Invited]}, volume={13}, DOI={10.1364/ome.497006},
number={112997}, journal={Optical Materials Express}, publisher={Optica Publishing
Group}, author={Lüders, Carolin and Barkhausen, Franziska and Pukrop, Matthias
and Rozas, Elena and Sperling, Jan and Schumacher, Stefan and Aßmann, Marc}, year={2023}
}'
chicago: Lüders, Carolin, Franziska Barkhausen, Matthias Pukrop, Elena Rozas, Jan
Sperling, Stefan Schumacher, and Marc Aßmann. “Continuous-Variable Quantum Optics
and Resource Theory for Ultrafast Semiconductor Spectroscopy [Invited].” Optical
Materials Express 13, no. 11 (2023). https://doi.org/10.1364/ome.497006.
ieee: 'C. Lüders et al., “Continuous-variable quantum optics and resource
theory for ultrafast semiconductor spectroscopy [Invited],” Optical Materials
Express, vol. 13, no. 11, Art. no. 2997, 2023, doi: 10.1364/ome.497006.'
mla: Lüders, Carolin, et al. “Continuous-Variable Quantum Optics and Resource Theory
for Ultrafast Semiconductor Spectroscopy [Invited].” Optical Materials Express,
vol. 13, no. 11, 2997, Optica Publishing Group, 2023, doi:10.1364/ome.497006.
short: C. Lüders, F. Barkhausen, M. Pukrop, E. Rozas, J. Sperling, S. Schumacher,
M. Aßmann, Optical Materials Express 13 (2023).
date_created: 2025-09-12T11:40:26Z
date_updated: 2025-09-12T11:41:42Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '706'
- _id: '35'
- _id: '230'
- _id: '27'
- _id: '623'
doi: 10.1364/ome.497006
intvolume: ' 13'
issue: '11'
language:
- iso: eng
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
- _id: '266'
name: 'PhoQC: Photonisches Quantencomputing'
publication: Optical Materials Express
publication_identifier:
issn:
- 2159-3930
publication_status: published
publisher: Optica Publishing Group
status: public
title: Continuous-variable quantum optics and resource theory for ultrafast semiconductor
spectroscopy [Invited]
type: journal_article
user_id: '16199'
volume: 13
year: '2023'
...
---
_id: '28254'
abstract:
- lang: eng
text: With the rapid advances of functional dielectric metasurfaces and their integration
on on-chip nanophotonic devices, the necessity of metasurfaces working in different
environments, especially in biological applications, arose. However, the metasurfaces’
performance is tied to the unit cell’s efficiency and ultimately the surrounding
environment it was designed for, thus reducing its applicability if exposed to
altering refractive index media. Here, we report a method to increase a metasurface’s
versatility by covering the high-index metasurface with a low index porous SiO2
film, protecting the metasurface from environmental changes while keeping the
working efficiency unchanged. We show, that a covered metasurface retains its
functionality even when exposed to fluidic environments.
article_type: original
author:
- first_name: René
full_name: Geromel, René
last_name: Geromel
- first_name: Christian
full_name: Weinberger, Christian
id: '11848'
last_name: Weinberger
- first_name: Katja
full_name: Brormann, Katja
last_name: Brormann
- first_name: Michael
full_name: Tiemann, Michael
id: '23547'
last_name: Tiemann
orcid: 0000-0003-1711-2722
- first_name: Thomas
full_name: Zentgraf, Thomas
id: '30525'
last_name: Zentgraf
orcid: 0000-0002-8662-1101
citation:
ama: Geromel R, Weinberger C, Brormann K, Tiemann M, Zentgraf T. Porous SiO2 coated
dielectric metasurface with consistent performance independent of environmental
conditions. Optical Materials Express. 2022;12(1):13-21. doi:10.1364/ome.444264
apa: Geromel, R., Weinberger, C., Brormann, K., Tiemann, M., & Zentgraf, T.
(2022). Porous SiO2 coated dielectric metasurface with consistent performance
independent of environmental conditions. Optical Materials Express, 12(1),
13–21. https://doi.org/10.1364/ome.444264
bibtex: '@article{Geromel_Weinberger_Brormann_Tiemann_Zentgraf_2022, title={Porous
SiO2 coated dielectric metasurface with consistent performance independent of
environmental conditions}, volume={12}, DOI={10.1364/ome.444264},
number={1}, journal={Optical Materials Express}, publisher={Optica}, author={Geromel,
René and Weinberger, Christian and Brormann, Katja and Tiemann, Michael and Zentgraf,
Thomas}, year={2022}, pages={13–21} }'
chicago: 'Geromel, René, Christian Weinberger, Katja Brormann, Michael Tiemann,
and Thomas Zentgraf. “Porous SiO2 Coated Dielectric Metasurface with Consistent
Performance Independent of Environmental Conditions.” Optical Materials Express
12, no. 1 (2022): 13–21. https://doi.org/10.1364/ome.444264.'
ieee: 'R. Geromel, C. Weinberger, K. Brormann, M. Tiemann, and T. Zentgraf, “Porous
SiO2 coated dielectric metasurface with consistent performance independent of
environmental conditions,” Optical Materials Express, vol. 12, no. 1, pp.
13–21, 2022, doi: 10.1364/ome.444264.'
mla: Geromel, René, et al. “Porous SiO2 Coated Dielectric Metasurface with Consistent
Performance Independent of Environmental Conditions.” Optical Materials Express,
vol. 12, no. 1, Optica, 2022, pp. 13–21, doi:10.1364/ome.444264.
short: R. Geromel, C. Weinberger, K. Brormann, M. Tiemann, T. Zentgraf, Optical
Materials Express 12 (2022) 13–21.
date_created: 2021-12-02T18:47:42Z
date_updated: 2023-03-08T08:13:58Z
department:
- _id: '15'
- _id: '230'
- _id: '289'
- _id: '623'
- _id: '2'
- _id: '35'
- _id: '307'
doi: 10.1364/ome.444264
intvolume: ' 12'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.osapublishing.org/ome/fulltext.cfm?uri=ome-12-1-13&id=465602
oa: '1'
page: 13-21
publication: Optical Materials Express
publication_identifier:
issn:
- 2159-3930
publication_status: published
publisher: Optica
quality_controlled: '1'
status: public
title: Porous SiO2 coated dielectric metasurface with consistent performance independent
of environmental conditions
type: journal_article
user_id: '23547'
volume: 12
year: '2022'
...
---
_id: '22450'
abstract:
- lang: eng
text: We realize and investigate a nonlinear metasurface taking advantage of intersubband
transitions in ultranarrow GaN/AlN multi-quantum well heterostructures. Owing
to huge band offsets, the structures offer resonant transitions in the telecom
window around 1.55 µm. These heterostructures are functionalized with an array
of plasmonic antennas featuring cross-polarized resonances at these near-infrared
wavelengths and their second harmonic. This kind of nonlinear metasurface allows
for substantial second-harmonic generation at normal incidence which is completely
absent for an antenna array without the multi-quantum well structure underneath.
While the second harmonic is originally radiated only into the plane of the quantum
wells, a proper geometrical arrangement of the plasmonic elements permits the
redirection of the second-harmonic light to free-space radiation, which is emitted
perpendicular to the surface.
article_number: '2134'
article_type: original
author:
- first_name: Jan
full_name: Mundry, Jan
last_name: Mundry
- first_name: Florian
full_name: Spreyer, Florian
last_name: Spreyer
- first_name: Valentin
full_name: Jmerik, Valentin
last_name: Jmerik
- first_name: Sergey
full_name: Ivanov, Sergey
last_name: Ivanov
- first_name: Thomas
full_name: Zentgraf, Thomas
id: '30525'
last_name: Zentgraf
orcid: 0000-0002-8662-1101
- first_name: Markus
full_name: Betz, Markus
last_name: Betz
citation:
ama: Mundry J, Spreyer F, Jmerik V, Ivanov S, Zentgraf T, Betz M. Nonlinear metasurface
combining telecom-range intersubband transitions in GaN/AlN quantum wells with
resonant plasmonic antenna arrays. Optical Materials Express. 2021;11(7).
doi:10.1364/ome.426236
apa: Mundry, J., Spreyer, F., Jmerik, V., Ivanov, S., Zentgraf, T., & Betz,
M. (2021). Nonlinear metasurface combining telecom-range intersubband transitions
in GaN/AlN quantum wells with resonant plasmonic antenna arrays. Optical Materials
Express, 11(7). https://doi.org/10.1364/ome.426236
bibtex: '@article{Mundry_Spreyer_Jmerik_Ivanov_Zentgraf_Betz_2021, title={Nonlinear
metasurface combining telecom-range intersubband transitions in GaN/AlN quantum
wells with resonant plasmonic antenna arrays}, volume={11}, DOI={10.1364/ome.426236},
number={72134}, journal={Optical Materials Express}, publisher={OSA}, author={Mundry,
Jan and Spreyer, Florian and Jmerik, Valentin and Ivanov, Sergey and Zentgraf,
Thomas and Betz, Markus}, year={2021} }'
chicago: Mundry, Jan, Florian Spreyer, Valentin Jmerik, Sergey Ivanov, Thomas Zentgraf,
and Markus Betz. “Nonlinear Metasurface Combining Telecom-Range Intersubband Transitions
in GaN/AlN Quantum Wells with Resonant Plasmonic Antenna Arrays.” Optical Materials
Express 11, no. 7 (2021). https://doi.org/10.1364/ome.426236.
ieee: J. Mundry, F. Spreyer, V. Jmerik, S. Ivanov, T. Zentgraf, and M. Betz, “Nonlinear
metasurface combining telecom-range intersubband transitions in GaN/AlN quantum
wells with resonant plasmonic antenna arrays,” Optical Materials Express,
vol. 11, no. 7, 2021.
mla: Mundry, Jan, et al. “Nonlinear Metasurface Combining Telecom-Range Intersubband
Transitions in GaN/AlN Quantum Wells with Resonant Plasmonic Antenna Arrays.”
Optical Materials Express, vol. 11, no. 7, 2134, OSA, 2021, doi:10.1364/ome.426236.
short: J. Mundry, F. Spreyer, V. Jmerik, S. Ivanov, T. Zentgraf, M. Betz, Optical
Materials Express 11 (2021).
date_created: 2021-06-16T05:52:21Z
date_updated: 2022-01-06T06:55:33Z
department:
- _id: '15'
- _id: '230'
- _id: '289'
- _id: '429'
doi: 10.1364/ome.426236
intvolume: ' 11'
issue: '7'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.osapublishing.org/ome/fulltext.cfm?uri=ome-11-7-2134&id=452008
oa: '1'
project:
- _id: '53'
name: TRR 142
- _id: '54'
name: TRR 142 - Project Area A
- _id: '65'
name: TRR 142 - Subproject A8
publication: Optical Materials Express
publication_identifier:
issn:
- 2159-3930
publication_status: published
publisher: OSA
quality_controlled: '1'
status: public
title: Nonlinear metasurface combining telecom-range intersubband transitions in GaN/AlN
quantum wells with resonant plasmonic antenna arrays
type: journal_article
user_id: '30525'
volume: 11
year: '2021'
...
---
_id: '9681'
article_number: '82'
author:
- first_name: Martin F.
full_name: Volk, Martin F.
last_name: Volk
- first_name: Christian E.
full_name: Rüter, Christian E.
last_name: Rüter
- first_name: Matteo
full_name: Santandrea, Matteo
id: '55095'
last_name: Santandrea
orcid: 0000-0001-5718-358X
- 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: Harald
full_name: Herrmann, Harald
id: '216'
last_name: Herrmann
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Detlef
full_name: Kip, Detlef
last_name: Kip
citation:
ama: Volk MF, Rüter CE, Santandrea M, et al. Fabrication of low-loss Rb-exchanged
ridge waveguides in z-cut KTiOPO_4. Optical Materials Express. Published
online 2017. doi:10.1364/ome.8.000082
apa: Volk, M. F., Rüter, C. E., Santandrea, M., Eigner, C., Padberg, L., Herrmann,
H., Silberhorn, C., & Kip, D. (2017). Fabrication of low-loss Rb-exchanged
ridge waveguides in z-cut KTiOPO_4. Optical Materials Express, Article
82. https://doi.org/10.1364/ome.8.000082
bibtex: '@article{Volk_Rüter_Santandrea_Eigner_Padberg_Herrmann_Silberhorn_Kip_2017,
title={Fabrication of low-loss Rb-exchanged ridge waveguides in z-cut KTiOPO_4},
DOI={10.1364/ome.8.000082},
number={82}, journal={Optical Materials Express}, author={Volk, Martin F. and
Rüter, Christian E. and Santandrea, Matteo and Eigner, Christof and Padberg, Laura
and Herrmann, Harald and Silberhorn, Christine and Kip, Detlef}, year={2017} }'
chicago: Volk, Martin F., Christian E. Rüter, Matteo Santandrea, Christof Eigner,
Laura Padberg, Harald Herrmann, Christine Silberhorn, and Detlef Kip. “Fabrication
of Low-Loss Rb-Exchanged Ridge Waveguides in z-Cut KTiOPO_4.” Optical Materials
Express, 2017. https://doi.org/10.1364/ome.8.000082.
ieee: 'M. F. Volk et al., “Fabrication of low-loss Rb-exchanged ridge waveguides
in z-cut KTiOPO_4,” Optical Materials Express, Art. no. 82, 2017, doi:
10.1364/ome.8.000082.'
mla: Volk, Martin F., et al. “Fabrication of Low-Loss Rb-Exchanged Ridge Waveguides
in z-Cut KTiOPO_4.” Optical Materials Express, 82, 2017, doi:10.1364/ome.8.000082.
short: M.F. Volk, C.E. Rüter, M. Santandrea, C. Eigner, L. Padberg, H. Herrmann,
C. Silberhorn, D. Kip, Optical Materials Express (2017).
date_created: 2019-05-07T14:54:33Z
date_updated: 2022-01-06T07:04:18Z
department:
- _id: '15'
- _id: '288'
doi: 10.1364/ome.8.000082
language:
- iso: eng
publication: Optical Materials Express
publication_identifier:
issn:
- 2159-3930
publication_status: published
status: public
title: Fabrication of low-loss Rb-exchanged ridge waveguides in z-cut KTiOPO_4
type: journal_article
user_id: '13244'
year: '2017'
...