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

Chia Ming Chang, Yu Jen Wang, Hung Shan Chen, Yi-Hsin Lin, Abhishek K. Srivastava, Vladimir G. Chigrinov*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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).

Original languageEnglish
Title of host publicationLiquid Crystals XIX
EditorsIam Choon Khoo
PublisherSPIE
ISBN (Electronic)9781628417319
DOIs
StatePublished - 1 Jan 2015
EventLiquid Crystals XIX - San Diego, United States
Duration: 9 Aug 201510 Aug 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9565
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceLiquid Crystals XIX
CountryUnited States
CitySan Diego
Period9/08/1510/08/15

Keywords

  • Liquid crystal lens; Low level light therapy; Ferroelectric liquid crystals; Lyot-Ohman filter

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