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Plasmonic nanosensor based on multiple independently tunable Fano resonances.

Lin Cheng1, Zelong Wang1, Xiaodong He1

  • 1Institute of Optoelectronics & Electromagnetic Information, Lanzhou University, Lanzhou 730000, China.

Beilstein Journal of Nanotechnology
|January 11, 2020
PubMed
Summary

This study introduces a novel refractive index nanosensor with compound structures, achieving high sensitivity up to 1900 nm/RIU. The design enables independent tuning of five Fano resonance peaks for compact on-chip plasmonic applications.

Keywords:
Fano resonancemetal–dielectric–metal (MDM) waveguidenanosensoron-chip plasmonic structuressurface plasmon polaritons (SPPs)

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Optical Sensing

Background:

  • Metal-dielectric-metal (MDM) waveguides are crucial for plasmonic devices.
  • Fano resonances offer sharp spectral features for sensing applications.
  • Miniaturization of on-chip photonic devices is a key research area.

Purpose of the Study:

  • To propose a novel refractive index nanosensor with compound structures.
  • To investigate the tunability and sensitivity of the proposed nanosensor.
  • To demonstrate a compact design for on-chip plasmonic applications.

Main Methods:

  • Numerical investigation using the finite element method (FEM).
  • Design and simulation of a metal-dielectric-metal (MDM) waveguide with resonators and stubs.
  • Analysis of transmission spectra and Fano resonance peaks.

Main Results:

  • The nanosensor exhibits up to five sharp Fano resonance peaks.
  • Each resonance peak can be independently tuned by adjusting structural parameters.
  • A high sensitivity of 1900 nm/RIU was achieved.
  • A compact design integrating T-shaped, ring, and split-ring cavities was proposed.

Conclusions:

  • The proposed nanosensor design offers high sensitivity and independent tunability.
  • The compact structure is suitable for on-chip integration.
  • This work advances the development of plasmonic devices for sensing and other photonic applications.