光泵浦对太赫兹波段0.6CaTiO-0.4NdAlO陶瓷介电性能的影响。

Effect of optical pumping on the dielectric properties of 0.6CaTiO-0.4NdAlO ceramics in the terahertz range.

作者信息

Li Dan, Luo Chunya, Xu Yebin, Zhang Jing, Wu Liang, Wang Huaixing, Shi Songjie, Ling Furi, Yao Jianquan

出版信息

Appl Opt. 2018 Jan 1;57(1):1-4. doi: 10.1364/AO.57.000001.

DOI:10.1364/AO.57.000001

Abstract

The dielectric properties of 0.6CaTiO-0.4NdAlO ceramics under external optical fields were investigated by terahertz time-domain spectroscopy in a frequency range of 0.2 THz to 1 THz at room temperature. It could be found that the variation of the real part of complex permittivity is approximately 0.31 in the frequency range of 0.2 THz to 1 THz. However the imaginary part of the dielectric constant does not change appreciably with the external optical field. The micromechanism of these results was attributed to the built-in electric field caused by the excited free carriers in the ceramics.

摘要

通过太赫兹时域光谱在室温下对0.6CaTiO-0.4NdAlO陶瓷在0.2太赫兹至1太赫兹频率范围内的外部光场下的介电特性进行了研究。可以发现，在0.2太赫兹至1太赫兹频率范围内，复介电常数实部的变化约为0.31。然而，介电常数的虚部随外部光场没有明显变化。这些结果的微观机制归因于陶瓷中受激发的自由载流子所引起的内建电场。