Abstract
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.
Highlights
Optical filters have been widely used in various optical devices and systems, especially in the optical communication field [1,2]
We demonstrate a tunable NIR filter based on sphere phase liquid crystal (SPLC)
We demonstrate the transmission properties of SPLC in external perturbations including temperature and electric field
Summary
Optical filters have been widely used in various optical devices and systems, especially in the optical communication field [1,2]. Liquid crystal (LC) materials with periodic structures exhibit a high potential for considerable use in broadening the tuning range such as cholesteric liquid crystal (CLC) [7,8], chiral smectic liquid crystal [9], and blue phase (BP) [10,11]. These materials are used in filters due to their flexible tunability in external perturbations such as temperature, electric field, light, spatial variation, and so on. The SPLC filter may achieve a wavelength variation of 256 nm by thermal modulation and 76 nm by electrical modulation
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