Journal
LIQUID CRYSTALS
Volume 47, Issue 2, Pages 255-262Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2019.1643044
Keywords
Cholesteric liquid crystal; light-reconfigurable; wavelength-selective; multifunctional; diffractive optical element
Funding
- National Natural Science Foundation of China (NSFC) [61435008, 61822504, 61705067, 51873060, 61575063]
- Shanghai Pujiang Program [16PJ1402200]
- Shanghai Rising-Star Program [17QA1401100]
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We propose a universal method of fabricating and operating a multifunctional diffractive optical element (DOE) with light-rewritable geometric phase and reflectance modulations enabled by pattern-aligned photoresponsive liquid crystal superstructures via manipulating the photoalignment layers as well as the phototunable helical pitch of the cholesteric liquid crystal (CLC) under different light stimuli, i.e. ultraviolet and visible (green) lights. The diffractive behaviour of the fabricated CLC DOE is simultaneously governed by the geometric phase induced by the pattern-aligned CLC and the reflectance (amplitude) modulation attributed to the helical pitch manipulation, endowing the proposed DOE with versatile practical light-controllable characteristics and outstanding performance.
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