Smart Mirrors for Photorefractive Control of Light with Tim Bunning, RX - Agile Filters Application
Technical Report,01 Feb 2014,31 Jan 2016
UNIVERSITA DEGLI STUDI DELLA CALABRIA COSENZA Italy
Pagination or Media Count:
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 70 C using a photosensitivenematic 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 3Vm electric field or temperature.