Temperature sensor of one dimensional liquid crystal defect photonic crystal

Abstract

Abstract:

Based on one dimensional photonic crystals infiltrated by nematic liquid crystal defect films, by the sensitivity of liquid crystals index on temperature, the temperature sensor of one dimensional liquid crystal defect photonic crystal was proposed. The temperature sensor property was obtained using the transfer matrix method, and was numerical calculated by Matlab program. The results show that the defect peak wavelength move into long wavelength, width of defect mode transmission peaks decrease with liquid crystal parallel medium surface，and the transmission peak wavelength move into short wavelength, width of defect mode transmission peaks increase with liquid crystal perpendicular medium surface. The temperature sensitivity of sensor not only is large than that of common defect, but also is different for different material and temperature, and increase rapid with about the liquid crystal clear point. The moving of the defect peak wavelength is nonlinear with temperature. Using one dimensional liquid crystal defect photonic crystal an experimentation system was set up for temperature measurement. The measure results accord with that of theory.

Key words: optoelectronics, temperature sensor, transfer matrix method, one dimensional photonic crystals, liquid crystals defect

QIAN Xiang-zhong. Temperature sensor of one dimensional liquid crystal defect photonic crystal[J]. J4, 2010, 27(4): 468-473.

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