標題: | An optical system adopting liquid crystals with electrical tunability of wavelength and energy density for low level light therapy |
作者: | Chang, Chia-Ming Wang, Yu-Jen Chen, Hung-Shan Lin, Yi-Hsin Srivastava, Abhishek Kumar Chigrinov, Vladimir Grigorievich 光電工程學系 Department of Photonics |
關鍵字: | Liquid crystal lens;Low level light therapy;Ferroelectric liquid crystals;Lyot-Ohman filter |
公開日期: | 1-一月-2015 |
摘要: | 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). |
URI: | http://dx.doi.org/10.1117/12.2188889 http://hdl.handle.net/11536/129747 |
ISBN: | 978-1-62841-731-9 |
ISSN: | 0277-786X |
DOI: | 10.1117/12.2188889 |
期刊: | LIQUID CRYSTALS XIX |
Volume: | 9565 |
起始頁: | 0 |
結束頁: | 0 |
顯示於類別: | 會議論文 |