title: Micro-patterned photo-aligned ferroelectric liquid crystal Fresnel zone lens.
abstract: In this Letter, we disclose a fast switchable Fresnel zone lens (FZL) by confining the ferroelectric liquid crystals (FLCs) in multiple microscopically defined photo-aligned alignment domains. The photo-alignment (PA) offers good control on the anchoring energy (W) by mean of irradiation doses (ID) and thus excellent alignment for FLCs. Two operational modes of the FLCFZL, i.e., FOCUS/OFF and FOCUS/DEFOCUS, were demonstrated. The proposed diffracting element provides fast response time, high diffraction efficiency (η), with saturated electro-optical (EO) operations up to high frequency (≈2  kHz). Thus, the proposed FLCFZLs with simple fabrication open several opportunities to improve the quality of existing devices and to find new applications.
authors: A K
authors: AK
authors: Srivastava
authors: X
authors: X
authors: Wang
authors: S Q
authors: SQ
authors: Gong
authors: D
authors: D
authors: Shen
authors: Y Q
authors: YQ
authors: Lu
authors: V G
authors: VG
authors: Chigrinov
authors: H S
authors: HS
authors: Kwok