基于偏振不敏感超材料的全光可调谐太赫兹慢光效应研究
Study on all-optical tunable terahertz slow-light effects based on polarization-insensitive metamaterials
金嘉升 1马成举 1张垚 1张跃斌 1鲍士仟 1李咪1
作者信息
- 1. 西安石油大学理学院,陕西西安 710065
- 折叠
摘要
太赫兹(terahertz,THz)慢光效应可以有效地提升THz脉冲数据传输的安全性和存储性,而一般THz慢光器件对入射THz波偏振态变化敏感.本文设计了一种超材料结构,其微结构单元由一个十字型谐振器和4个U型谐振器构成.研究表明:基于超材料的THz慢光效应对线偏振光和圆偏振光均不敏感.通过对超材料结构的参数优化,获得到了最大群折射率为1618的慢光效应.另外,本文在超材料微结构层和SiO2衬底之间嵌入了一层二硫化钼(MoS2)薄膜,当MoS2的载流子浓度从1.7×1017 cm-3增大到5.1×1019 cm-3时,群折射率从1 566减小到26.实现了偏振不敏感全光可调谐的THz慢光效应.该研究有望为偏振不敏感和全光可调谐的THz慢光器件设计提供崭新的研究思路.
Abstract
The terahertz(THz)slow-light effect can effectively improve the security and memory proper-ty of THz pulse data during transmission.However,the general THz slow-light devices are sensitive to the polarization state changing of the incident THz wave.In this paper,we design a metamaterial struc-ture whose unit cell consists of one cross resonator and four U-shaped resonators.The results show that the THz slow-light effects based on metamaterials are not sensitive to both linear and circularly polarized light.A slow-light effect with the maximum group refractive index of 1618 is obtained by optimizing pa-rameters of the metamaterial structure.A molybdenum disulfide film between the metamaterial micro-structure layer and the SiO2 substrate is embedded.When the carrier concentration of molybdenum disul-fide increases from 1.7 ×1017 cm-3 to 5.1×1019 cm-3,the group refractive index decreases from 1566 to 26,and a polarization insensitive all-light tunable THz slow-light effect is realized.This study can pro-vides some new ideas for the design of polarization insensitive and all-light tunable THz slow-light de-vices.
关键词
超材料/太赫兹(THz)/慢光效应/偏振不敏感/二硫化钼(MoS3)Key words
metamaterials/terahertz(THz)/slow-light effects/polarization-insensitive/MoS2引用本文复制引用
基金项目
西安石油大学创新与实践能力培养项目(YCS20213210)
出版年
2023
NETL
NSTL
维普
万方数据