Novel Even Beam Splitters Based on Subwavelength Binary Simple Periodic Rectangular Structure
Novel Even Beam Splitters Based on Subwavelength Binary Simple Periodic Rectangular Structure
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DOI：
10.1007/s40820-015-0031-y
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发表时间：
2015-04-01
影响因子：
26.6
通讯作者：
Xu, Ping
中科院分区：
文献类型：
--
作者：
Huang, Haixuan;Ruan, Shuangchen;Xu, Ping
本文提出了一种将严格耦合波分析与遗传算法相结合的亚波长二元简单周期矩形结构实现均匀分束的新方法。设计了几种太赫兹波段的均匀分束器，其中一种硅基分束器的总效率达到92.23%，可将一束入射光分成四束出射光。零级衍射效率降至0.192%以下，均匀性误差降至6.51 × 10 ~（-6）。这些结果突破了传统标量理论对均匀分束的限制。此外，还研究了入射角、波长以及偏振角对衍射效率和均匀性的影响。
In this paper, a novel method of a subwavelength binary simple periodic rectangular structure is presented to realize even beam splitting by combining the rigorous couple-wave analysis with the genetic algorithm. Several even splitters in the terahertz region were designed and one of the silicon-based beam splitters designed to separate one incident beam into four emergent beams has total efficiency up to 92.23 %. Zero-order diffraction efficiency was reduced to less than 0.192 % and the error of uniformity decreased to 6.51 x 10(-6). These results break the limitation of even beam splitting based on the traditional scalar theory. In addition, the effects of the incident angle, wavelength, as well as the polarizing angle on the diffraction efficiency and uniformity were also investigated.