Optically rewritable ferroelectric liquid-crystal grating
Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong
Received: 25 January 2013
Accepted: 12 April 2013
This paper describes the fabrication procedure and optical characterization of ferroelectric liquid-crystal (FLC) gratings based on photo-alignment. The fabrication procedure includes only one side photo-alignment substrate, while the other substrate does not have any alignment layer. Both 1D and 2D gratings have been fabricated. The proposed diffraction element shows high diffraction efficiency ∼ 65% and fast response time of 50 μs, which is much faster than the existing technologies. Such gratings can be operated with high frequency of around 2 kHz at the electric field of 6.67 V/μm. Moreover, the proposed grating can be erased and rewritten optically for different grating vector in simple steps. Therefore, with these advance features, such gratings have high potential to be applied in verity of devices and for the improvement of some important existing devices.
PACS: 42.79.Kr – Display devices, liquid-crystal devices / 42.79.Dj – Gratings / 61.30.Hn – Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions
© EPLA, 2013