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Broadband Polarization Beam Splitter Based on Silicon Dual-Core Photonic Crystal Fiber with Gold Layers Operating in Mid-Infrared Band

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Abstract

In response to the immediate requirements of modern high-speed and high-capacity integrated optical circuit development, this study introduces a broadband all-fiber polarization beam splitter (PBS) based on silicon dual-core photonic crystal fiber (PCF) and gold layers. Simulation results demonstrate that silicon as the substrate material is conducive to extending the operating range to the mid-infrared band of 3.0 ~ 3.6 μm. The modulation effect of the gold ring layers on the left and right sides of central elliptical hole is very impressive, and when the cladding hole diameter d1 = 1.3 μm, gold-coated hole diameter d2 = 1.8 d1 = 2.34 μm, hole-to-hole pitch Λ = 2.0 μm, gold layer thickness t = 50 nm, long axis a = 2.08 μm, and short axis b = 1.43 μm, coupling length ratio (CLR) between x- and y-polarized super-mode exactly is equal to 2. According to performance investigation by finite element method (FEM), this PBS is well suited for splitting out x-polarized light in core A, which can possess a minimum size of 0.66 mm, a maximum extinction ratio (ER) of 78 dB at 3.3 μm, a broad operating bandwidth of 450 nm, and a low insertion loss (IL) of 0.15 dB at 3.3 μm simultaneously. The proposed PBS features both high integration and high performance, which will be applicable to all-optical networks in mid-infrared fields.

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Data Availability

This work is a theoretical work, and we used COMSOL software to obtain all simulation data. The programs used, the procedures followed, and the data generated for this work can be available on request from the corresponding author, whose email address indicated at the first page of this manuscript.

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Funding

This work was financially supported by the National Natural Science Foundation of China (Grant No. 61973178), the Smart Grid Joint Fund of State Key Program of National Natural Science Foundation of China (Grant No. U2066203), and the Major natural science projects of colleges and universities in Jiangsu Province (Grant No. 21KJA470006).

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Authors and Affiliations

  1. School of Electrical Engineering, Nantong University, Nantong, 226019, China

    Nan Chen, Yunpeng Xiao, Wenhui Guo, Yanming Huang, Luhao Guo, Chenxun Liu & Yiming Xu

  2. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China

    Xin Ding

  3. Key Laboratory of Optical Technology and Instrument for Medicine, Ministry of Education, College of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Luyao Wang

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  1. Nan Chen
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Contributions

Conceptualization, Nan Chen Xin Ding and Luyao Wang; methodology, Nan Chen; software, Yunpeng Xiao and Wenhui Guo; validation, Nan Chen and Yiming Xu; formal analysis, Yanming Huang and Luhao Guo; investigation, Chenxun Liu; resources, Yiming Xu; data curation, Nan Chen; writing original draft preparation, Nan Chen; writing—review and editing, Xin Ding; visualization, Luyao Wang and Nan Chen; supervision, Yiming Xu; project administration, Yiming Xu; funding acquisition, Yiming Xu. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Nan Chen.

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Chen, N., Ding, X., Wang, L. et al. Broadband Polarization Beam Splitter Based on Silicon Dual-Core Photonic Crystal Fiber with Gold Layers Operating in Mid-Infrared Band. Plasmonics (2023). https://doi.org/10.1007/s11468-023-02117-z

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