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We measure the pitch variation of cholesteric liquid crystals (CLCs) according to the applied electric field using a wavelength-swept laser. While the electric field is applied to the CLC, the pitch of the CLC is elongated normal to the direction of electric field. Therefore, the reflection band is shifted to the longer wavelength. When the applied electric field to the CLC cell was over 1.52 V/μm,...
We report a measurement of effective refractive index of a nematic liquid crystal Fabry-Perot etalon according to the applied static electric field intensity. The effective refractive index decreases from 1.67 to 1.51 as the applied electric field intensity is increased.
We report a dynamic fiber-optic electric field sensor using a nematic liquid crystal (LNC) Fabry-Perot etalon and a wavelength-swept laser (WSL). The WSL has a linear relationship between the wavelength measurement and the time measurement. When a modulated electric field of the proper amplitude and frequency is applied to the NLC, the transmission wavelength peaks for the ordinary mode are maintained,...
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