Main > HPArticle > A flat transmitted serrated-phase high-contrast-index subwavelength grating beam splitter
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  • Manuscript Accepted: Jul. 14, 2020

    Online Published: Jul. 15, 2020

Chinese Optics Letters, 2020, Vol. 18, Issue 11, pp.

A flat transmitted serrated-phase high-contrast-index subwavelength grating beam splitter [Early Posting]

Li Gongqing, Duan Xiaofeng, Huang Yongqing, Liu kai, Ren Xiaomin

Author Affiliations

  • Beijing University of Posts and Telecommunications Institute of Information Photonics and Optical Communications
  • Beijing University of Posts and Telecommunications Institute of Information Photonics and Optical Communications
  • Beijing University of Posts and Telecommunications
  • Beijing University of Posts and Telecommunications Institute of Information Photonics and Optical Communications

Abstract

We proposed a method to form a flat transmitted serrated-phase high-contrast-index subwavelength grating (HCG) beam splitter (SP-HBS) for all dielectric materials which is to alternately arrange two kind of grating bars with a phase difference of π. Comparing to the typical linear-phase HCG beam splitter (LP-HBS) which consist of two symmetrical deflecting grating, the SP-HBS is extensible in size, can achieve excellent splitting abilities regardless of normal incidence or small-angle oblique incidence with large deflection angles and 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 paper, we designed an SP-HBS with a 44.8° deflection angle and a 90.28% transmissivity.

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