Light-rewritable geometric phase and reflectance modulations enabled by pattern-aligned photoresponsive liquid crystal superstructures

Qin, Jian‐Zhong; Wang, Xiaoqian; Yuan, Cong‐Long; Zheng, Zhigang; Shen, Dong

doi:10.1080/02678292.2019.1643044

Cited by 7 publications

(2 citation statements)

References 37 publications

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“…Recent studies in ref. [29][30][31][32][33][34][35][36][37] have shown the helical pitch of chiral LC (CLC) can be modified under light stimulation by employing a photosensitive chiral dopant, which signifies the potential under the pure optical phase modulation control for LC, providing a new dimension on the reconfigurability of GPOE. Previous works presented in ref.…”

Section: Introductionmentioning

confidence: 99%

“…Previous works presented in ref. [29,30] have studied the photoresponsive CLC superstructures which manipulate the helical pitch to locally modulate the reflectance so as to diffract light via the reflective geometric phase and ref. [30] has further extended this for the waveband tunability as well as the light-induced phase profile flippability of a reflective LC-GPOE via the photoinvertible chiral superstructure.…”

Section: Introductionmentioning

confidence: 99%

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Light Reconfigurable Topological Optical Phase Structure Enabled by a Photoresponsive Chiral System

Wang

Tam

Yang

et al. 2023

Advanced Optical Materials

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The ability to establish significant phase modulation at low applied field provides a promising route toward polarization control and wavefront shaping for liquid‐crystal‐based devices. Owing to the polarization‐selective reflectivity of chiral liquid crystals (CLCs), reflective wavefront shaping via geometric phase is demonstrated when a circularly polarized light is Bragg reflected by a spatially orientated chiral layer. Nowadays, photoresponsive CLCs have attracted extensive attention due to their exotic feature that endows the CLC devices with the capability of electric‐free remote control. Despite the mature photoresponsive CLC materials and the sophisticated reflective geometric phase devices, a light‐induced topological optical phase modulation for a transmissive wave exiting a CLC cell remains elusive. Here, with the employment of a photosensitive chiral dopant, a hybrid aligned photoresponsive CLC system, demonstrating the simultaneous light modulation of topological geometric phase and dynamic phase via helical pitch manipulation is established. The continuous dual‐phase modulation engenders a smooth optically controllable diffraction efficiency (i.e., from <5% to >90%) of the proposed light‐reconfigurable CLC geometric phase optical element prototypes with multistable diffractive behavior, thus launching a paradigm shift for the application of novel liquid‐crystal photonic devices in the field of all‐optical polarization and spin processing.

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