Journal
OPTICAL MATERIALS
Volume 34, Issue 1, Pages 251-255Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2011.08.022
Keywords
Holographic polymer-dispersed liquid crystal (H-PDLC); Photoisomerization; All-optical switching; Diffraction grating
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Funding
- National Science Council, Taiwan [99-2221-E-260-024, 98-2113-M-040-003-MY2]
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This study characterizes the all-optical switching effect in holographic polymer-dispersed liquid crystal transmission gratings. The light-induced switching behaviors of these structures are due to the doped azobenzene-derived LC (azo-LC), which changes the refractive index of phase-separated LC within the polymer composite. This study also optimizes the polymer-dispersed liquid crystal formulation containing 15 wt.% azo-LC and 35 wt.% nematic LC to achieve a grating performance with a tunable diffraction efficiency of 78% and a fast switching-on time (0.5 s) with a relatively small light stimulus of 9 mW/cm(2). (C) 2011 Elsevier B.V. All rights reserved.
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