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POLICRYPS-based electrically switchable Bragg reflector
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DOI：10.1364/OE.23.032696.png)
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Abstract
En 中文
The formation and characterization of a switchable volume reflective element fabricated from a polymer liquid crystal (LC) polymer slice (POLICRYPS) structure by holographic photopolymerization at high temperature (65 degrees C) using a photosensitive/nematic liquid crystal prepolymer mixture is reported. The submicron Bragg structure formed consists of periodic continuous polymeric walls separated by periodic LC channels. The phase separated NLC self-aligns in a homeotropic alignment between the polymer walls as indicated by polarizing optical microscopy analysis (Maltese cross). The resulting periodic grating structure results in a Bragg reflection notch upon illumination with white light due to the periodic variation in refractive index. Electro-optical experiments realized through in-plane electrodes and temperature experiments confirm that the multilayer structure acts as a Bragg mirror whose reflection efficiency can be controlled by either a small (similar to 3V/mu m) electric field or temperature. (C) 2015 Optical Society of America
Keywords:
DISPERSED LIQUID-CRYSTALS
PHOTONIC CRYSTALS
GRATINGS
FABRICATION
PHASE
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