Metalens polarization beam splitter based on fiber end face

Jing Huang; Zuliang Ruan; Jingjing Zheng; Li Pei; Tigang Ning; Jing Li; Jianshuai Wang; Bing Bai

doi:10.1117/12.2654853

15 December 2022 Metalens polarization beam splitter based on fiber end face

Jing Huang, Zuliang Ruan, Jingjing Zheng, Li Pei, Tigang Ning, Jing Li, Jianshuai Wang, Bing Bai

Proceedings Volume 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022); 124783O (2022) https://doi.org/10.1117/12.2654853
Event: Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 2022, Xi'an, China

Abstract

Polarization beam splitter is an important part of integrated optical system to overcome the strong polarization dependence of silicon nanodevices, and has broad application prospects in optical fiber communication and polarization imaging. In this paper, a polarization beam splitter of metalens based on the fiber end face is designed. Through the planar light field control ability of metalens and the coordinated regulation of the geometric phase and propagation phase, the device adjusts the medium duty cycle in the meta-unit and the rotation angle of the nanoantenna to realize the polarization beam splitting and focusing simultaneously. In order to simplify the manufacturing process and achieve high focusing efficiency even further, Si with high transmittance in the near infrared band is selected as the nanoantenna, and SiO₂ is used as the substrate. Since the substrate used the same material with fiber cladding, compared with the traditional polarization beam splitter, the structure can directly etch the nanofins periodically on the fiber end face, which is convenient for optical system integration. Theoretical design and numerical simulation results show that any polarized light in fiber cladding can realize polarization focusing through fiber end face.

Citation Download Citation

Jing Huang, Zuliang Ruan, Jingjing Zheng, Li Pei, Tigang Ning, Jing Li, Jianshuai Wang, and Bing Bai "Metalens polarization beam splitter based on fiber end face", Proc. SPIE 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 124783O (15 December 2022); https://doi.org/10.1117/12.2654853

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KEYWORDS

Polarization

Dielectric polarization

Beam splitters

Silicon

Cladding

Dielectrics

Wave propagation

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