Open AccessFull-color reflectance-tunable filter based on liquid crystal cladded guided-mode resonant grating
Author(s) -
Chun-Ta Wang,
Hao-Hsiang Hou,
Ping-Chien Chang,
Cheng-Chang Li,
HungChang Jau,
YungJr Hung,
TsungHsien Lin
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.022892
Subject(s) - guided mode resonance , optics , materials science , transmittance , grating , wavelength , liquid crystal tunable filter , polarization (electrochemistry) , optoelectronics , optical filter , resonance (particle physics) , color gel , liquid crystal , resonator , diffraction grating , filter (signal processing) , ray , layer (electronics) , physics , chemistry , particle physics , computer science , composite material , computer vision , thin film transistor
This work proposes a tunable reflective guided-mode resonant (GMR) filter that incorporates a 90° twisted nematic liquid crystal (TNLC). The GMR grating acts as an optical resonator that reflects strongly at the resonance wavelength and as an alignment layer for LC. The 90° TNLC functions as an achromic polarization rotator that alters the polarization of incident light. The resonance wavelength and reflectance of such a filter can be controlled by setting the angle of incidence and driving the 90° TNLC, respectively. The designed filter exhibits a very large spectral shift in resonance wavelength from 710 to 430 nm, which covers the entire visible spectrum. The transmittance can be tuned to within 10 V at various resonance wavelengths. The hybrid GMR - LC filter is compact, has a simple design, and is easy to fabricated. It can therefore be used in practical applications.