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Multi-mode surface plasmon resonance absorber based on dart-type single-layer graphene.

Hao Chen1, Zihao Chen1, Hua Yang2

  • 1School of Science, State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology Mianyang 621010 China yizaomy@swust.edu.cn zhouzigang@swust.edu.cn daibo@swust.edu.cn.

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This study introduces a novel graphene-based perfect absorber with polarization independence and tunability. The proposed multi-mode surface plasmon resonance absorber demonstrates high absorption efficiencies and sensitivities, suitable for photodetectors and chemical sensors.

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Area of Science:

  • Plasmonics and Metamaterials
  • Nanophotonics
  • Materials Science

Background:

  • Surface plasmon resonance (SPR) absorbers are crucial for various optical applications.
  • Graphene's unique electronic and optical properties make it a promising material for advanced photonic devices.
  • Developing tunable, polarization-independent absorbers with high performance remains a key challenge.

Purpose of the Study:

  • To propose and numerically investigate a novel multi-mode surface plasmon resonance (SPR) absorber.
  • To demonstrate the polarization-independent and tunable absorption characteristics of the proposed device.
  • To evaluate the absorber's sensitivity and figure of merit for potential sensing applications.

Main Methods:

  • Design of a dart-type single-layer graphene array on a silicon dioxide spacer and metal reflector.
  • Numerical simulations to analyze absorption spectra, efficiencies, and angular dependence.
  • Investigation of tunability by adjusting geometric parameters, graphene's chemical potential, and relaxation time.
  • Assessment of sensing performance by exposing the structure to varying environmental refractive indices.

Main Results:

  • Achieved perfect polarization-independent absorption (>99%) at four distinct resonance wavelengths.
  • Demonstrated effective tunability of absorption through geometric and graphene property modifications.
  • Observed high absorption across a wide incident angle range (0° to 50°).
  • Obtained high maximum sensitivities (up to 839.39 nm/RIU) and figures of merit (up to 54.03 RIU⁻¹) in four resonance modes.

Conclusions:

  • The proposed graphene-based SPR absorber offers excellent performance, including polarization independence and dynamic tunability.
  • The device exhibits significant potential for applications in photodetectors and chemical sensors due to its high sensitivity and figure of merit.
  • This work provides a new design strategy for tunable multi-band perfect metamaterial absorbers.