Terahertz optical properties of nematic liquid crystals depended on different external fields

被引：0

作者：

Liu Y. ^{[1
]}

Fan F. ^{[1
]}

Chen S. ^{[1
]}

Yang L. ^{[1
]}

Chen M. ^{[1
]}

Deng D. ^{[1
]}

Wang X. ^{[1
]}

Chang S. ^{[1
]}

机构：

[1] Key Laboratory of Optical Information Science and Technology, Ministry of Education Institute of Modern Optics, Nankai University, Tianjin

来源：

Chang, Shengjiang (sjchang@nankai.edu.cn) | 1600年 / Chinese Optical Society卷 / 36期

关键词：

Nematic liquid crystals; Physical optics; Refractive index change; Terahertz wave;

D O I：

10.3788/AOS201636.0226001

中图分类号：

学科分类号：

摘要：

Terahertz time domain spectroscopy (THz-TDS) is used to investigate the optical properties of nematic liquid crystals E7 and 5CB under the external magnetic field, electric field and optical field in the THz range. It is systematically summarized that the optical property changes of nematic liquid crystals under different external fields. It is experimentally observed that a negative magneto refractive index change under the magnetic field and a positive refractive index change under the electric field. The maximum values of magneto and electric refractive index changes reach-0.087 and 0.051, respectively. The physical mechanism of photorefractive effect is the same as electric refractive effect, and the maximum value of photorefractive coefficient is 0.015 under the power of 532 nm laser with 7.961 W/cm2 output. These research results are significant for the key THz devices such as tunable phase shifters, filters and the spatial light modulator in THz technology and applications. © 2016, Chinese Laser Press. All right reserved.

引用

页数：9

共 31 条

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