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10. Intrinsic and photo-induced optical properties of photoaligning azo-based materials coupled with liquid crystal systems

Author

Podoliak, Nina, Mavrona, Eleni, Mailis, Sakellaris, Gill, Jordan, Ronald Ewan, D'alessandro, Giampaolo, Apostolopoulos, Vasileios, Tabiryan, Nelson, and Kaczmarek, Malgosia

Abstract

Photoaligning azobenzene-based PAAD materials can show strong photoresponse without a surface relief pattern. We report an experimental investigation of PAADs optical properties, such as complex refractive indices and optically induced birefringence. Formation of photoinduced phase gratings in 20-50 nm, thin PAAD layers is demonstrated, with a strong dependence of diffraction on the probe beam polarization. The light induced diffraction in liquid crystal systems coupled with PAAD films is also studied. We demonstrate a stable and strong diffraction grating, which can be rewritten by illumination or switched off by reorienting the liquid crystals with a bias voltage.

Published
2017

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