Optically controlled flexodomains in chiral nematics

Peng, Weipeng and Liang, Fei and Liao, Yangquan and Jing, Hongzhen and Xiang, Ying and Salamon, Péter and Éber, Nándor and Buka, Ágnes and Wang, Ling and Trišović, Nemanja and Zhang, Huaiping (2025) Optically controlled flexodomains in chiral nematics. JOURNAL OF APPLIED PHYSICS, 137 (21). No.-214503. ISSN 0021-8979

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Abstract

Periodic flexoelectric domains (FDs) stimulated by both electric and optical fields were examined in a photosensitive chiral nematic liquid crystal. It was observed that the optical field is an excellent candidate to modulate the morphology and electric threshold voltage of FDs, by either an optically induced surface effect through photo-alignment or an optically induced bulk effect through the optical control of chirality. With preset spatial patterns of the optical field, proof-of-concept prototypes of ring-shaped and fan-shaped gratings were constructed, which can be used in encoders to measure the angle directly and precisely.

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