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Proceedings Paper

Method of preparing a tunable-focus liquid-crystal (LC) lens
Author(s): Xiaolong Li; Zuowei Zhou; Hongwen Ren
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Paper Abstract

A liquid crystal (LC) lens is prepared by controlling the alignment of a LC using a homogeneous polyimide (PI) layer and a homeotropic PI layer. The rubbed homogeneous PI layer has a concave surface and the homeotropic PI layer is flat. The LC sandwiched between the two PI layers obtains a hybrid alignment which has the largest gradient of refractive index (GRIN) distribution. The LC layer exhibits a lens character because of its convex shape. Since the effective refractive index of the LC is larger than that of the homogeneous PI, the LC lens can focus a light with the shortest focal length in the voltage-off state. By applying an external voltage, the LC molecules can be reoriented along the electric field. As a result, the focal length of the LC lens is reduced. The focal length of the LC lens can be tuned from ~30 to ~120 μm when the voltage is changed from 0 to 7 Vrms. This LC lens has the advantages of no threshold, low operating voltage, and simple fabrication.

Paper Details

Date Published: 8 February 2018
PDF: 7 pages
Proc. SPIE 10555, Emerging Liquid Crystal Technologies XIII, 105551A (8 February 2018); doi: 10.1117/12.2286584
Show Author Affiliations
Xiaolong Li, Chonbuk National Univ. (Korea, Republic of)
Zuowei Zhou, Chonbuk National Univ. (Korea, Republic of)
Hongwen Ren, Chonbuk National Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 10555:
Emerging Liquid Crystal Technologies XIII
Liang-Chy Chien, Editor(s)

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