TY  - JOUR
A1  - Ryabchun, Alexander
A1  - Sakhno, Oksana
A1  - Stumpe, Joachim
A1  - Bobrovsky, Alexey
T1  - Full-Polymer Cholesteric Composites for Transmission and Reflection Holographic Gratings
JF  - Advanced optical materials
N2  - A new type of self-organized materials based on cholesteric networks filled with photoactive side-chain copolymer is being developed. Supramolecular helical structure of cholesteric polymer network resulting in the selective reflection is used as a photonic scaffold. Photochromic azobenzene-containing nematic copolymer is embedded in cholesteric scaffold and utilized as a photoactive media for optical pattering. 1D and 2D transmission diffraction gratings are successfully recorded in composite films by holographic technique. For the first time the possibility to create selective reflection gratings in cholesteric material mimicking the natural optical properties of cholesteric mesophase is demonstrated. That enables the coexistence of two selective gratings, where one has an intrinsic cholesteric periodic helical structure and the other is a holographic grating generated in photochromic polymer. The full-polymer composites provide high light-induced optical anisotropy due to effective photo-orientation of side-chain fragments of the azobenzene-containing liquid crystalline polymer, and prevent the degradation of the helical superstructure maintaining all optical properties of cholesteric mesophase. The proposed class of optical materials could be easily applied to a broad range of polymeric materials with specific functionality. The versatility of the adjustment and material preprogramming combined with high optical performance makes these materials a highly promising candidate for modern optical and photonic applications.
KW  - azobenzene
KW  - cholesteric scaffolds
KW  - holography
KW  - LC polymer
KW  - polarization diffraction grating
KW  - reflection grating
Y1  - 2017
U6  - https://doi.org/10.1002/adom.201700314
SN  - 2195-1071
VL  - 5
SP  - 376
EP  - 379
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Sakhno, Oksana V.
A1  - Goldenberg, Leonid M.
A1  - Stumpe, Joachim
A1  - Smirnova, Tatiana N.
T1  - Effective volume holographic structures based on organic-inorganic photopolymer nanocomposites
N2  - We demonstrate a practical approach for the development of a broad range of nanocomposites based on acrylate polymers and organically capped inorganic nanoparticles (NPs). The submicrometer scale volume patterning of the nanocomposites using holographic photopolymerization was investigated. The specific adjustment of both the material parameters (core-shell of the NP, monomer mixture, concentrations) and the patterning conditions led to materials that were suitable for the fabrication of effective optical diffractive elements and specific functional microdevices with light-emissive and nonlinear optical (NLO) properties. The nanocomposite preparation and properties, their holographic performance and some examples of functional polymer-NP structures are reported.
Y1  - 2009
UR  - http://iopscience.iop.org/1464-4258
U6  - https://doi.org/10.1088/1464-4258/11/2/024013
SN  - 1464-4258
ER  - 
TY  - JOUR
A1  - Ryabchun, Alexander
A1  - Kollosche, Matthias
A1  - Wegener, Michael
A1  - Sakhno, Oksana
T1  - Holographic Structuring of Elastomer Actuator: First True Monolithic Tunable Elastomer Optics
JF  - Advanced materials
N2  - Volume diffraction gratings (VDGs) are inscribed selectively by diffusive introduction of benzophenone and subsequent UV-holographic structuring into an electroactive dielectric elastomer actuator (DEA), to afford a continuous voltage-controlled grating shift of 17%. The internal stress coupling of DEA and optical domain allows for a new generation of true monolithic tunable elastomer optics with voltage controlled properties.
Y1  - 2016
U6  - https://doi.org/10.1002/adma.201602881
SN  - 0935-9648
SN  - 1521-4095
VL  - 28
SP  - 10217
EP  - 10223
PB  - Wiley-VCH
CY  - Weinheim
ER  -