Mid-Infrared Silicon Photonic Crystal Fiber Polarization Filter Based on Surface Plasmon Resonance Effect

Qu, Yuwei, Yuan, Jinhui, Zhou, Xian, Li, Feng, Yan, Binbin, Wu, Qiang, Wang, Kuiru, Sang, Xinzhu, Long, Keping and Yu, Chongxiu (2020) Mid-Infrared Silicon Photonic Crystal Fiber Polarization Filter Based on Surface Plasmon Resonance Effect. Optics Communications, 463. p. 125387. ISSN 0030-4018

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Abstract

In this paper, a novel silicon photonic crystal fiber (Si-PCF) polarization filter based on surface plasmon resonance effect is proposed for the first time. With the full-vector finite-element method, the mode coupling characteristics of the Si-PCF with the gold-coated film between the core mode and surface plasmonpolariton mode are investigated, and the confinement losses are analyzed. The confinement losses of the Y-polarized core mode at the three resonant wavelengths 2.84, 3.29, and 4.53 μm are 9235.9, 27097.5, and 97818.3 dB/m, respectively. The extinction ratio reaches -391 dB and the insertion loss is less than 1 dB when the Si-PCF length is 4 mm, along with the filter bandwidth of 2.75 μm. Moreover, by modifying the fiber structure parameters, the filter bandwidth of the proposed three kinds of Si-PCF polarization filters can cover 2.75 to 7.80 μm. It is believed that the proposed Si-PCF polarization filter has important applications in the mid-infrared laser and optical communication systems.

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