Research on a Dual-Mode Infrared Liquid-Crystal Device for Simultaneous Electrically Adjusted Filtering and Zooming
Research on a Dual-Mode Infrared Liquid-Crystal Device for Simultaneous Electrically Adjusted Filtering and Zooming
复制标题
一种同时电调滤波和变焦的双模红外液晶器件的研究
DOI：
10.3390/mi10020137
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发表时间：
2019-02-01
期刊：
影响因子：
3.4
通讯作者：
Xie, Changsheng
中科院分区：
文献类型：
--
作者：
Liu, Zhonglun;Chen, Mingce;Xie, Changsheng
A new dual-mode liquid-crystal (LC) micro-device constructed by incorporating a Fabry-Perot (FP) cavity and an arrayed LC micro-lens for performing simultaneous electrically adjusted filtering and zooming in infrared wavelength range is presented in this paper. The main micro-structure is a micro-cavity consisting of two parallel zinc selenide (ZnSe) substrates that are pre-coated with similar to 20-nm aluminum (Al) layers which served as their high-reflection films and electrodes. In particular, the top electrode of the device is patterned by 44 x 38 circular micro-holes of 120 m diameter, which also means a 44 x 38 micro-lens array. The micro-cavity with a typical depth of similar to 12 m is fully filled by LC materials. The experimental results show that the spectral component with needed frequency or wavelength can be selected effectively from incident micro-beams, and both the transmission spectrum and the point spread function can be adjusted simultaneously by simply varying the root-mean-square value of the signal voltage applied, so as to demonstrate a closely correlated feature of filtering and zooming. In addition, the maximum transmittance is already up to similar to 20% according the peak-to-valley value of the spectral transmittance curves, which exhibits nearly twice the increment compared with that of the ordinary LC-FP filtering without micro-lenses.
