Issue

Vol. 7 No. 2 (2015)

Novel Even Beam Splitters Based on Subwavelength Binary Simple Periodic Rectangular Structure

https://doi.org/10.1007/s40820-015-0031-y
Haixuan Huang
College of Electronic Science and Technology, Institute of Micro-Nano Optoelectronic Technology, Shenzhen University, Shenzhen 518060, People’s Republic of China
Shuangchen Ruan
College of Electronic Science and Technology, Institute of Micro-Nano Optoelectronic Technology, Shenzhen University, Shenzhen 518060, People’s Republic of China
Tuo Yang
College of Electronic Science and Technology, Institute of Micro-Nano Optoelectronic Technology, Shenzhen University, Shenzhen 518060, People’s Republic of China
Ping Xu
College of Electronic Science and Technology, Institute of Micro-Nano Optoelectronic Technology, Shenzhen University, Shenzhen 518060, People’s Republic of China

Corresponding Author: Ping Xu

xuping@szu.edu.cn

Nano-Micro Letters, Vol. 7 No. 2 (2015), Article Number: 177-182

Abstract

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 × 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.

Keywords

Beam splitters Binary optics Diffraction gratings Diffraction theory Subwavelength structures
Huang, Haixuan, Shuangchen Ruan, Tuo Yang, and Ping Xu. 2015. “Novel Even Beam Splitters Based on Subwavelength Binary Simple Periodic Rectangular Structure”. Nano-Micro Letters 7 (2):177-82. https://doi.org/10.1007/s40820-015-0031-y.
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