Abstract
Refractive index of a cholesteric liquid crystal (chiral pitch: 5 μm) was evaluated in the infrared region to realize a polarization-insensitive device. The liquid crystal exhibited an isotropic refractive index, since its helical microstructure was too small to recognize with a long-wavelength infrared beam (2–8 μm). No polarization dependence appeared in interference spectra of a Fabry-Perot filter that consisted of the liquid crystal and silicon plates. The refractive index of the LC, which was evaluated from the interference peak wavelengths, changed from 1.58 to 1.49 as applied voltage increased from 0 to 18 V. This index change was close to theoretical prediction and greater than that of a polymer-stabilized blue-phase LC.
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