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A Tunable NIR Filter with Sphere Phase Liquid Crystal

Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Author to whom correspondence should be addressed.
Crystals 2019, 9(7), 349;
Received: 7 June 2019 / Revised: 3 July 2019 / Accepted: 6 July 2019 / Published: 8 July 2019
(This article belongs to the Special Issue Liquid Crystal Optics and Physics: Recent Advances and Prospects)
PDF [2342 KB, uploaded 8 July 2019]


A near-infrared (NIR) filter with sphere phase liquid crystal (SPLC) is proposed, which shows a low operating electric field and large temperature-gradient modulations. The central wavelength of the Bragg reflection can be thermally tuned from 1580 nm to 1324 nm with a temperature-gradient of 42.7 nm/K. Meanwhile, the central wavelength can be electrically tuned over 76 nm within a low operating electric field of 0.3 V/μm. Thus, the SPLC filter may achieve a wavelength variation of 256 nm by thermal modulation and 76 nm by electrical modulation. The SPLC filter shows great potential applications in optical communication devices. View Full-Text
Keywords: liquid-crystal devices; filter; liquid crystals liquid-crystal devices; filter; liquid crystals

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Sun, C.; Lu, J. A Tunable NIR Filter with Sphere Phase Liquid Crystal. Crystals 2019, 9, 349.

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