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Flat transmitted serrated-phase high-contrast-index subwavelength grating beam splitter

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Abstract

We proposed a method to form a flat transmitted serrated-phase (SP) high-contrast-index subwavelength grating (HCG) beam splitter (HBS) for all dielectric materials, which is to alternately arrange two kinds of grating bars with a phase difference of π. Compared to the typical linear-phase (LP) HBS, which consists of two symmetrical deflecting gratings, the SP-HBS is extensible in size, and can achieve excellent splitting ability regardless of normal incidence or small-angle oblique incidence with large deflection angles, higher diffraction efficiency, lower energy loss, and higher tolerance of fabrication accuracy. Furthermore, the incident light can be split in half at any part of the SP-HBS, and the output beams of light maintain the original shape. In this Letter, we designed an SP-HBS with a 44.8° deflection angle and a 90.28% transmissivity.

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DOI:10.3788/COL202018.110504

所属栏目:Diffraction, Gratings, and Holography

基金项目:This work was supported by the National Natural Science Foundation of China (Nos. 61674018, 61574019, and 61674020).

收稿日期:2020-04-11

录用日期:2020-07-14

网络出版日期:2020-09-11

作者单位    点击查看

李宫清:State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
段晓峰:State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
黄永清:State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
刘凯:State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
任晓敏:State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China

联系人作者:段晓峰(xfduan@bupt.edu.cn)

备注:This work was supported by the National Natural Science Foundation of China (Nos. 61674018, 61574019, and 61674020).

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引用该论文

Gongqing Li, Xiaofeng Duan, Yongqing Huang, Kai Liu, Xiaomin Ren, "Flat transmitted serrated-phase high-contrast-index subwavelength grating beam splitter," Chinese Optics Letters 18(11), 110504 (2020)

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