Temperature tuning of the stop band in transmission spectra of liquid-crystal infiltrated synthetic opal as tunable photonic crystal

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作者：

K Yoshino，Y Shimoda，Y Kawagishi，K Nakayama，M Ozaki

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摘要：

Nematic liquid crystals and smectic liquid crystals can be infiltrated into a three-dimensional periodic array of interconnected nanosize voids in opal films prepared by sedimentation ofSiO2spheres of various diameters. The optical stop band in the transmission spectra of opals shifts drastically by the infiltration of liquid crystals. The stop band is also found to shift at the phase transition points with changing temperature. This effect enables the tuning of optical properties of opals as a prototype tunable photonic crystal. This phenomenon can also be used as a measurement method for the refractive index.

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关键词：

Experimental/ infrared spectra liquid crystal phase transformations nematic liquid crystals optical arrays optical tuning photonic band gap refractive index measurement sedimentation silicon compounds smectic liquid crystals spectral line shift visible spectra/ liquid-crystal infiltrated synthetic opal tunable photonic crystal transmission spectra stop band temperature tuning nematic liquid crystals smectic liquid crystals three-dimensional periodic array interconnected nanosize voids opal films SiO 2 sphere sedimentation optical stop band shift phase transition points refractive index measurement method SiO 2/ A4270Q Photonic bandgap materials A7820P Photonic band gap (condensed matter) A4270D Liquid crystals (optical materials) A6470M Transitions in liquid crystals A7840 Visible and ultraviolet spectra (condensed matter) A7830 Infrared and Raman spectra and scattering (condensed matter) A7865 Optical properties of thin films and low-dimensional structures A7820D Optical constant