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利用太赫兹时域光谱技术(THz-TDS)测试向列相液晶E7和5CB在磁场、电场和光场作用下的太赫兹光学性质,较为全面地总结向列相液晶在不同场强下的折射率变化。实验观察到E7和5CB在磁场下的负磁致折变效应和在电场下的正电致折变效应。磁致折射率变化最大达到-0.087,电致折射率变化最大达到0.051,而光致折变与电致折变的物理本质相同,在7.961 W/cm2的532 nm激光抽运下折射率变化最大达到0.015。这些研究结果为液晶材料在太赫兹波段的可调相移器、滤波器和空间光调制器等重要功能器件中的应用打下基础。
The terahertz optical properties of nematic liquid crystal E7 and 5CB under the action of magnetic field, electric field and light field were measured by THz-TDS spectroscopy. The refractive indices of nematic liquid crystal under different field intensities Variety. The negative magneto-reflexive effect of E7 and 5CB under magnetic field and the positive electro-refraction effect of E7 and 5CB were observed experimentally. The maximum change of the refractive index of the magnetism reaches -0.087, the maximum of the refractive index of the electro-optic reaches 0.051, and the physical essence of the photorefractive and the electrochromic changes is the same. The maximum refractive index changes under the 532 nm laser pumping of 7.961 W / cm2 Reached 0.015. These findings provide the basis for the application of liquid crystal materials in important functional devices such as tunable phase shifters, filters and spatial light modulators in the terahertz band.