Surface Plasmon Resonance-Based Silicon Dual-Core Photonic Crystal Fiber Polarization Beam Splitter at Mid-Infrared Spectral Region

Qu, Yuwei, Yuan, Jinhui, Zhou, Xian, Li, Feng, Yan, Binbin, Wu, Qiang, Wang, Kuiru, Sang, Xinzhu, Long, Keping and Yu, Chongxiu (2020) Surface Plasmon Resonance-Based Silicon Dual-Core Photonic Crystal Fiber Polarization Beam Splitter at Mid-Infrared Spectral Region. Journal of the Optical Society of America B, 37 (8). pp. 2221-2230. ISSN 0740-3224

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Abstract

In this paper, a novel silicon dual-core photonic crystal fiber (Si-DC-PCF) polarization beam splitter (PBS) based on surface plasmon resonance effect is proposed. The mode coupling characteristics between the X and Y-polarized even and odd modes and surface plasmon polariton mode are analyzed by using the finite element method and coupled-mode theory. The influences of the structure parameters of the Si-DC-PCF on the coupling length and coupling length ratio are investigated. The normalized output power of the X and Y-polarized modes in the cores A and B and the corresponding extinction ratio are also discussed. By optimizing the structure parameters of the Si-DC-PCF, the PBS length of 192 μm and bandwidth of 830 and 730 nm in the cores A and B are achieved. It is believed that the proposed Si-DC-PCF PBS can find important applications in the mid-infrared laser and sensing systems.

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