基于谐振环的太赫兹宽带偏振转换器件研究

发布时间：2018-01-23 03:48

本文关键词： 谐振环宽带太赫兹偏振转换　出处：《物理学报》2017年18期 　论文类型：期刊论文

【摘要】：提出了一个基于谐振环结构的宽带且高效的太赫兹线偏振转换器.该结构由金属-电介质-金属三层构成,位于顶层的是基于开口谐振环的超表面,中间为介质层,底部为金属板.实验结果表明,该结构可以在0.59-1.24 THz频率范围内将线偏振的太赫兹波偏振方向旋转90°,转换率超过80%.通过计算该结构在所研究的频率范围内反射光的偏振角和椭圆角,证实了该结构可以在较宽的频率范围内实现高效的线偏振转换.对该结构在偏振转换率高的频率下表面电流和电场进行仿真,分析了高偏振转换率和宽带的机理.同时,研究了该结构的偏振转换率对入射角以及偏振角的依赖性,结果表明该结构在0°-30°入射角范围内、-10°-10°偏振角范围内均有很好的偏振转换性能.
[Abstract]:A wideband and efficient terahertz linear polarization converter based on resonant ring structure is proposed. The structure consists of metal dielectric metal three layers and the top layer is a supersurface based on an open resonant ring. The dielectric layer is in the middle and the metal plate is at the bottom. The experimental results show that the structure can rotate the polarization direction of the linearly polarized terahertz wave 90 掳in the frequency range of 0.59-1.24 THz. The conversion rate exceeds 80. The polarization angle and elliptical angle of the reflected light in the studied frequency range are calculated by the structure. It is proved that the structure can achieve efficient linear polarization conversion in a wide frequency range. The surface current and electric field of the structure with high polarization conversion rate are simulated. The mechanism of high polarization conversion rate and wide band is analyzed. At the same time, the dependence of polarization conversion rate on incidence angle and polarization angle is studied. The results show that the structure is in the range of 0 掳-30 掳incidence angle. In the range of -10 掳-10 掳polarization angle, the polarization conversion performance is very good.
【作者单位】：首都师范大学物理系;北京市成像技术高精尖创新中心;太赫兹光电子学教育部重点实验室;
【基金】：国家自然科学基金(批准号:61575130,61575131,50971094) 北京市自然科学基金-北京市教育委员会科技计划重点项目(批准号:KZ201310028032)资助的课题~~
【分类号】：O441.4
【正文快照】： 材料结构可以实现左旋和右旋圆偏振光的不对称1引言传播[24],利用超材料结构在0.62—0.65 THz频段实现了线偏振到圆偏振的转换[25].近年来,使用太赫兹波具有安全性、透视性、吸水性、高分超材料结构已经实现了双带以及多带[26]圆偏振转辨等诸多优越特性,在光谱[1-6]、成像[7-1

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