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Plasmonic Refractive Index Sensor and Plasmonic Bandpass Filter Including Graded 4-Step Waveguide Based on Fano Resonances

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Abstract

A plasmonic refractive index sensor including a metal–insulator-metal (MIM) waveguide with four teeth is proposed. Transmittance (T), sensitivity (S), and figure of merit (FOM) were investigated numerically and analyzed via the finite difference time domain method (FDTD). The simulation results show the generation of double Fano resonances in the system that the resonance wavelength and the resonance line-shapes can be adjusted by changing the geometry of the device. This device is optimized by changing the length of the teeth and their distance from each other. As a result, the maximum sensitivity and FOM values are 1078 nm/RIU and 1.54 × 106, respectively. Due to proper performance and adjustable Fano resonance points, this structure is significant for fabricating sensitive refractive index sensor and plasmonic bandpass filter.

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Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.

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All codes included in this paper are available upon request by contact with the corresponding author.

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Authors and Affiliations

  1. Department of Atomic and Molecular Physics, Faculty of Sciences, Mazandaran University, Babolsar, Iran

    Vahid Najjari, Saeed Mirzanejhad & Amin Ghadi

Authors
  1. Vahid Najjari
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  2. Saeed Mirzanejhad
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  3. Amin Ghadi
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All authors have same contribution in the analytical and numerical calculations and read and approved the final manuscript.

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Correspondence to Saeed Mirzanejhad.

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Najjari, V., Mirzanejhad, S. & Ghadi, A. Plasmonic Refractive Index Sensor and Plasmonic Bandpass Filter Including Graded 4-Step Waveguide Based on Fano Resonances. Plasmonics 17, 1809–1817 (2022). https://doi.org/10.1007/s11468-022-01667-y

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