中国激光, 2019, 46 (1): 0114002, 网络出版: 2019-01-27   

光敏可调的多波段电磁诱导透明超材料分析 下载: 878次

Analysis of Photosensitive Tunable Multiband Electromagnetically Induced Transparency Metamaterials
作者单位
北京交通大学光波技术研究所全光网络与现代通信网教育部重点实验室, 北京 100044
摘要
设计了一种基于光敏半导体砷化镓的主动式电磁诱导透明超材料。砷化镓的光电特性使该超材料结构中的外围圆环能在各个光照条件下响应不同频率的电磁波; 其与中心开口环耦合, 分别能够在1.47 THz与0.7 THz两个频点处产生强烈的电磁诱导透明效应。通过调节光照强度来改变砷化镓的电导率, 并拆分表面金属环结构进行对比, 分析了该超材料结构的光敏性能与其实现多波段电磁诱导透明效应的物理机理; 同时研究了砷化镓宽度、中心开口环开口大小与基底厚度对电磁诱导透明效应的影响。仿真结果表明, 该超材料结构能够在不同光照条件下, 于太赫兹波段的多个频点处产生高强度的波速迟滞效应, 并伴随较高的折射率灵敏度, 在太赫兹缓存器件与折射率传感领域有一定的应用价值。
Abstract
An active electromagnetically induced transparency (EIT) metamaterial is designed based on photosensitive gallium arsenide. The photoelectric characteristics of gallium arsenide make the peripheral circular closed loop (PCCL) in a metamaterial structure respond to electromagnetic waves with different frequencies under different illumination conditions. It is coupled with its central split ring resonators (CSRRs) and thus a strong EIT effect is produced at two frequencies of 0.7 THz and 1.5 THz. The conductivity of gallium arsenide is changed by adjustment of light intensity, and the structures of surface metal rings are dismantled and compared. The photosensitivity of this metamaterial structure and the physical mechanism for the realization of a multiband EIT are analyzed. At the same time, the influences of gallium arsenide width, CSRRs opening size and substrate thickness on EIT are investigated. The simulation results show that this metamaterial structure can be used to achieve a strong hysteresis effect at multiple frequency points and simultaneously a relatively high refractive index sensitivity in the terahertz frequency range under different illumination conditions. It has certain application value in the fields of terahertz buffer devices and refractive index sensing.

李广森, 延凤平, 王伟, 乔楠. 光敏可调的多波段电磁诱导透明超材料分析[J]. 中国激光, 2019, 46(1): 0114002. Li Guangsen, Yan Fengping, Wang Wei, Qiao Nan. Analysis of Photosensitive Tunable Multiband Electromagnetically Induced Transparency Metamaterials[J]. Chinese Journal of Lasers, 2019, 46(1): 0114002.

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