Electrically-Tunable Blue Phase Liquid Crystal Microlens Array Based on a Photoconductive Film

Autor: Bing-Yau Huang, Shuan-Yu Huang, Chia-Hsien Chuang, Chie-Tong Kuo
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Polymers, Vol 12, Iss 1, p 65 (2020)
Druh dokumentu: article
ISSN: 2073-4360
12010065
DOI: 10.3390/polym12010065
Popis: This paper proposes an effective approach to fabricate a blue phase liquid crystal (BPLC) microlens array based on a photoconductive film. Owing to the characteristics of photo-induced conducting polymer polyvinylcarbazole (PVK), in which conductivity depends on the irradiation of UV light, a progressive mask resulting in the variation of conductivity is adopted to produce the gradient distribution of the electric field. The reorientations of liquid crystals according to the gradient distribution of the electric field induce the variation of the refractive index. Thus, the incident light experiences the gradient distribution of the refractive index and results in the focusing phenomenon. The study investigates the dependence of lens performance on UV exposure time, the focal length of the lens, and focusing intensities with various incident polarizations. The BPLC microlens array exhibits advantages such as electrically tunability, polarization independence, and fast response time.
Databáze: Directory of Open Access Journals
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