https://doi.org/10.1140/epjp/s13360-026-07305-4
Regular Article
Broadband dual-window in-fiber plasmonic polarization filter using dual-ring gold layer deposited photonic crystal fiber
1
School of Electrical Engineering and Automation, Nantong University, 226019, Nantong, China
2
Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, Nanjing University of Aeronautics and Astronautics, 210016, Nanjing, China
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, 200093, Shanghai, China
a
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Received:
5
September
2025
Accepted:
11
January
2026
Published online:
21
January
2026
Abstract
To satisfy the high-performance and wide-bandwidth filtering requirements of optical communication systems, this work presents a broadband dual-window in-fiber polarization filter based on gold layer deposited photonic crystal fiber (PCF), using finite element method. There are two coupling mechanisms in this device. This allows the bandwidth to cover two communication windows of 1.31 and 1.55 μm, while simultaneously featuring high filtering capabilities. The numerical results indicate that when the appropriate structural parameters are determined, two SPR coupling mechanisms will occur within the proposed PCF, which is beneficial for the gold-deposited PCF to achieve superior filtering performance. The 1-mm-long all-fiber filter possesses the maximum extinction ratios (ERs) of − 46.7 dB at 1.31 μm and − 55.1 dB at 1.55 μm, with an operating bandwidth of > 820 nm (> 1.28 μm) in the investigated band. Additionally, the PCF filter has ease of manufacture. This high-performance in-fiber filter is anticipated to play a significant role in modern communication networks, including multiplexing/demultiplexing, wavelength selection, optical add-drop multiplexing, and fully optical signal processing at network nodes.
Supplementary Information The online version contains supplementary material available at https://doi.org/10.1140/epjp/s13360-026-07305-4.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
