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Proceedings Paper

An optical system adopting liquid crystals with electrical tunability of wavelength and energy density for low level light therapy
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Paper Abstract

We have developed a bistable negative lens by integrating a polarization switch of ferroelectric liquid crystals (FLCs) with a passively anisotropic focusing element. The proposed lens not only exhibits electrically tunable bistability but also fast response time of sub-milliseconds, which leads to good candidate of optical component in optical system for medical applications. In this paper, we demonstrate an optical system consisting of two FLC phase retarders and one LC lenses that exhibits both of electrically tunable wavelength and size of exposure area. The operating principles and the experimental results are discussed. The tunable spectrum, exposure area size and tunable irradiance are illustrated. Compared to conventional lenses with mechanical movements in the medical light therapy system, our electrically switchable optical system is more practical in the portable applications of light therapy (LLLT).

Paper Details

Date Published: 5 September 2015
PDF: 7 pages
Proc. SPIE 9565, Liquid Crystals XIX, 95650K (5 September 2015); doi: 10.1117/12.2188889
Show Author Affiliations
Chia-Ming Chang, National Chiao Tung Univ. (Taiwan)
Yu-Jen Wang, National Chiao Tung Univ. (Taiwan)
Hung-Shan Chen, National Chiao Tung Univ. (Taiwan)
Yi-Hsin Lin, National Chiao Tung Univ. (Taiwan)
Abhishek Kumar Srivastava, Hong Kong Univ. of Science and Technology (Hong Kong, China)
Vladimir Grigorievich Chigrinov, Hong Kong Univ. of Science and Technology (Hong Kong, China)

Published in SPIE Proceedings Vol. 9565:
Liquid Crystals XIX
Iam Choon Khoo, Editor(s)

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