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<p>A novel plasmonic bandpass filter is proposed, comprising an infinity-shaped resonator integrated with metal-insulator-metal (MIM) waveguide structures. The proposed profile enables tunable spectral filtering in the near-infrared region. Owing to its unique structure, the resonator supports three distinct resonant modes, producing a characteristic triple-peak transmission spectrum spanning the wavelength range of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:0.8-3\:\mu\:m\)</EquationSource> </InlineEquation>. Numerical simulations confirm that the spectral response of the proposed waveguide-consisting resonance positions, bandwidth and transmission intensities-can be precisely matched by adjusting the resonator’s geometric parameters. This filter demonstrates a high transmission efficiency (more than <i>0.8</i>) and a desirable quality factor at the subwavelength-scale, which indicates its originality and importance. The tunable narrowband performance in a wide spectral window highlights its potential for diverse applications in optical sensing, biomedical imaging, spectral filtering, optoelectronic systems as well as astronomical instrumentation.</p>

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Narrowband filter based on MIM plasmonic waveguide with a ∞-shaped resonator

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Ghasem KhosroBeygi,
  • Mehran Shahmansouri

摘要

A novel plasmonic bandpass filter is proposed, comprising an infinity-shaped resonator integrated with metal-insulator-metal (MIM) waveguide structures. The proposed profile enables tunable spectral filtering in the near-infrared region. Owing to its unique structure, the resonator supports three distinct resonant modes, producing a characteristic triple-peak transmission spectrum spanning the wavelength range of \(\:0.8-3\:\mu\:m\) . Numerical simulations confirm that the spectral response of the proposed waveguide-consisting resonance positions, bandwidth and transmission intensities-can be precisely matched by adjusting the resonator’s geometric parameters. This filter demonstrates a high transmission efficiency (more than 0.8) and a desirable quality factor at the subwavelength-scale, which indicates its originality and importance. The tunable narrowband performance in a wide spectral window highlights its potential for diverse applications in optical sensing, biomedical imaging, spectral filtering, optoelectronic systems as well as astronomical instrumentation.