基于太赫兹亚波长超材料的偏振不敏感调制器的理论研究

对太赫兹波超材料调制器的偏振响应进行了研究.提出并计算仿真了两种特殊结构的调制器,包括中心十字结构和双开口环结构.传统的开口环结构的调制器是偏振敏感的,而所研究的两种结构都是偏振不敏感的.中心十字结构是一个完全对称的金属结构,并具有完美的偏振不敏感特性.对于双开口环结构,它没有达到完全的偏振不敏感,但从太赫兹偏振透射率曲线来看,这种差别可以忽略不计.此外还模拟了双开口环的表面电流分布,并提出了产生两个谐振吸收波谷的主要机制.

Theoretical investigations of THz subwavelength metamaterials polarization insensitive modulators

The polarization response of THz wavelength metamaterials modulators were studied, and two special modulators structures were proposed and simulated: the center cross structure and twins split ring structure. Compared with the traditional split ring resonator modulators which were all polarization sensitive, the new two structures had properties of polarization insensitive. The center cross structure was a completely symmetrical metal structure and had the perfect characteristics of the polarization insensitive. For the twins split ring structure, they didn' t achieve polarization insensitive completely, but the difference of THz polarization transmittance curves could be negligible. The surface current distribution of twins split ring structure was aslo simulated, and two main transmission mechanisms for the generation of two resonant absorption valleys were presented.