TY  - JOUR
A1  - Schaal, Frederik
A1  - Rutloh, Michael
A1  - Weidenfeld, Susanne
A1  - Stumpe, Joachim
A1  - Michler, Peter
A1  - Pruss, Christof
A1  - Osten, Wolfgang
T1  - Optically addressed modulator for tunable spatial polarization control
JF  - Optics express : the international electronic journal of optics
N2  - We present an optically addressed non-pixelated spatial light modulator. The system is based on reversible photoalignment of a LC cell using a red light sensitive novel azobenzene photoalignment layer. It is an electrode-free device that manipulates the liquid crystal orientation and consequently the polarization via light without artifacts caused by electrodes. The capability to miniaturize the spatial light modulator allows the integration into a microscope objective. This includes a miniaturized 200 channel optical addressing system based on a VCSEL array and hybrid refractive-diffractive beam shapers. As an application example, the utilization as a microscope objective integrated analog phase contrast modulator is shown. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Y1  - 2018
U6  - https://doi.org/10.1364/OE.26.028119
SN  - 1094-4087
VL  - 26
IS  - 21
SP  - 28119
EP  - 28130
PB  - Optical Society of America
CY  - Washington
ER  - 
TY  - GEN
A1  - Schaal, Frederik
A1  - Rutloh, Michael
A1  - Weidenfeld, Susanne
A1  - Stumpe, Joachim
A1  - Michler, Peter
A1  - Pruss, Christof
A1  - Osten, Wolfgang
T1  - Optically addressed modulator for tunable spatial polarization control
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - We present an optically addressed non-pixelated spatial light modulator. The system is based on reversible photoalignment of a LC cell using a red light sensitive novel azobenzene photoalignment layer. It is an electrode-free device that manipulates the liquid crystal orientation and consequently the polarization via light without artifacts caused by electrodes. The capability to miniaturize the spatial light modulator allows the integration into a microscope objective. This includes a miniaturized 200 channel optical addressing system based on a VCSEL array and hybrid refractive-diffractive beam shapers. As an application example, the utilization as a microscope objective integrated analog phase contrast modulator is shown. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1001 
KW  - nematic liquid crystals
KW  - command surfaces
KW  - light modulator
KW  - alignment
KW  - films
KW  - polymer
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-446263
SN  - 1866-8372
IS  - 1001
SP  - 28119
EP  - 28130
ER  - 
TY  - JOUR
A1  - Stumpe, Joachim
A1  - Sakhno, O.
A1  - Gritsai, Y.
A1  - Rosenhauer, R.
A1  - Fischer, Th.
A1  - Rutloh, Michael
A1  - Schaal, F.
A1  - Weidenfeld, S.
A1  - Jetter, M.
A1  - Michler, P.
A1  - Pruss, C.
A1  - Osten, W.
T1  - Active and passive LC based polarization elements
JF  - Molecular crystals and liquid crystals
N2  - Passive and active polarization elements were created by surface and bulk photo-alignment of LCs, reactive LCs, photo-sensitive LCP and photo-curable monomer/LC composites. The use of different photo-sensitive liquid crystalline materials for the development of highly anisotropic elements with high spatial resolution and stability or, alternatively, fast switch ability will be discussed. Photo-active and voltage tunable polarization and diffraction elements are presented. For active micro-optic application a photo-addressed patterned retarder was created. Electrically switchable diffraction gratings were generated by interference exposure of photo-curable LC composites at room temperature characterized by droplet free morphology. These polarization sensitive diffraction elements are characterized be excellent optical properties and low switching times.
KW  - electrically switchable gratings.
KW  - diffractive elements
KW  - polymer/LC composites
KW  - switchable retarder
KW  - polarization gratings
KW  - Polarization elements
Y1  - 2014
U6  - https://doi.org/10.1080/15421406.2014.917503
SN  - 1542-1406
SN  - 1563-5287
VL  - 594
IS  - 1
SP  - 140
EP  - 149
PB  - Routledge, Taylor & Francis Group
CY  - Abingdon
ER  -