Volume 16 Issue 5
Sep.  2023
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WANG Fang, LIU Hua, MA Tao, MA Shou-dao, LIU Yu-fang. Double-slot ultra-compact polarization beam splitter based on asymmetric hybrid plasmonic structure[J]. Chinese Optics, 2023, 16(5): 1215-1225. doi: 10.37188/CO.EN.2022-0028
Citation: WANG Fang, LIU Hua, MA Tao, MA Shou-dao, LIU Yu-fang. Double-slot ultra-compact polarization beam splitter based on asymmetric hybrid plasmonic structure[J]. Chinese Optics, 2023, 16(5): 1215-1225. doi: 10.37188/CO.EN.2022-0028

Double-slot ultra-compact polarization beam splitter based on asymmetric hybrid plasmonic structure

doi: 10.37188/CO.EN.2022-0028
Funds:  Supported by National Natural Science Foundation of China (NSFC) (No. 62075057)
More Information
  • Author Bio:

    WANG Fang (1972—), female, born in Xinxiang, Henan Province, Ph.D, professor, doctoral supervisor, graduated from Henan Normal University in 2013 and is mainly engaged in the research of optical fiber sensing and new microelectronic device design. E-mail: 021034@htu.edu.cn

    LIU Hua (1995—), female, born in Anyang, Henan Province, master’s student, and is mainly engaged in the design of photoelectric integrated devices. E-mail: lh18237269109@163.com

  • Corresponding author: lh18237269109@163.com
  • Received Date: 13 Dec 2022
  • Rev Recd Date: 30 Jan 2023
  • Accepted Date: 16 Feb 2023
  • Available Online: 22 Feb 2023
  • To improve the extinction ratio of a polarization beam splitter, we propose a dual-slot ultra-compact polarization splitter (PBS) consisting of a hybrid plasma Horizontal Slot Waveguide (HSW) and a silicon nitride hybrid Vertical Slot Waveguide (VSW). The coating material is silicon dioxide, which can prevent the oxidation of the mixed plasma and also facilitate integration with other devices. The mode characteristics of the HSW and VSW are simulated by using the Finite Element Method (FEM). At suitable HSW and VSW widths, the TE polarization modes in HSW and VSW are phase-matched, while the TM polarization modes are phase mismatched. Therefore, the TE mode in an HSW waveguide is strongly coupled with a VSW waveguide by adopting a dual-slot, while the TM mode directly passes through the HSW waveguide. The results show that PBS achieves an Extinction Ratio (ER) of 35.1 dB and an Insertion Loss (IL) of 0.34 dB for the TE mode at 1.55 μm. For the TM mode, PBS reached 40.9 dB for ER and 2.65 dB for IL. The proposed PBS is designed with 100 nm bandwidth, high ER, and low IL, which can be suitable for photonic integrated circuits (PICs).

     

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