Full-color reflectance-tunable filter based on liquid crystal cladded guided-mode resonant grating.
Opt Express
; 24(20): 22892-22898, 2016 Oct 03.
Article
em En
| MEDLINE
| ID: mdl-27828356
ABSTRACT
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.
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MEDLINE
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En
Ano de publicação:
2016
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Article