异向介质体内太赫兹波增强效应及谐振特性研究

基于开口谐振环(SRR)的电磁响应特性以及严格电磁场理论，研究了由开口谐振环结构构成的异向介质体内的太赫兹波增强效应及谐振行为。仿真模拟了谐振环结构体内电场、电场能量密度和能流量的空间分布，讨论了电场能量密度随入射太赫兹波频率的变化规律。此外，还分析了谐振环结构参数对异向介质的谐振特性及其太赫兹波增强效应的影响。研究结果表明，在开口谐振环结构的开口缝隙处存在显著的太赫兹波增强效应，不仅电场显著增强，而且还会出现电场能量密度极值，并且，谐振时的电场增强效应比非谐振时明显增大。此外，谐振频率和电场能量密度均会随着谐振环结构参数的变化而呈现明显变化。

Abstract

Based on the electromagnetic response characteristics of split ring resonators (SRRs) and the rigorous electromagnetic field theory, the enhancement effect of terahertz (THz) wave and the resonance characteristics in the metamaterial consisting of split ring resonators are studied. The spatial distributions of the electric field, the electric energy density and the power flow in split ring resonators are mainly simulated. The variation of the electric energy density with different terahertz frequencies is also investigated. Furthermore, the effect of the parameters of the split ring resonators on the enhancement effect of terahertz wave and the resonance characteristics in the metamaterial are analyzed. It can be shown from our simulation results that the enhancement effect of terahertz wave occurs obviously in the gap of the split ring resonators. Not only the electric field near the opening is obviously stronger than that in other regions, especially in the gap of the split ring resonators, but also the maximum of the electric energy density appears in the opening of the SRRs, and the electric field is obviously stronger near the resonance frequency of the SRRs. Moreover, the resonance frequency and the electric energy density vary obviously with the parameters of the SRRs.

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孟庆龙, 邵文毅, 李建龙, 张彬. 异向介质体内太赫兹波增强效应及谐振特性研究[J]. 激光与光电子学进展, 2014, 51(2): 023001. Meng Qinglong, Shao Wenyi, Li Jianlong, Zhang Bin. Study on the Enhancement Effect of Terahertz Wave and the Resonance Characteristics in Metamaterial[J]. Laser & Optoelectronics Progress, 2014, 51(2): 023001.

异向介质体内太赫兹波增强效应及谐振特性研究

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