High-efficiency, polarization-insensitive 1400-lines/mm retroreflective metagrating with cascaded nano-optical modes

Posted on 22.09.2022 - 18:35
Retroreflective grating with high line density is one of the most desirable optical elements, which is capable of channeling the reflected light towards the source with high angular resolution. Metagrating can steer the incident light into the desired diffraction order with ultrahigh deflection angle and unitary efficiency. However, in practice, the diffraction efficiency of metagrating with a small period is very sensitive to the unit cells, thus leading to significant challenges in the fabrication process. In this paper, a kind of high-efficiency, polarization-independent retroreflective metagrating with cascaded nano-optical modes on the high reflection film, is proposed. It is found that the conception may increase fabrication toleration more than two times. 1400 lines/mm metagrating is experimentally realized for the first time, which shows an excellent broadband diffraction spectrum with 96% efficiency over 50 nm in TE and TM polarizations. This proposed novel metagrating brings benefits to the miniature optical systems.

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Qi, Hongguang; Xie, Lingyun; Zhu, Jingyuan; Wei, Zeyong; Jiao, Hongfei; SMIRNOV, YURY; et al. (2022): High-efficiency, polarization-insensitive 1400-lines/mm retroreflective metagrating with cascaded nano-optical modes. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.6102405.v3
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AUTHORS (9)

Hongguang Qi
Lingyun Xie
Jingyuan Zhu
Zeyong Wei
Hongfei Jiao
YURY SMIRNOV
Alexander Tikhonravov
Zhanshan Wang
Xinbin Cheng

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