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Detuned Plasmonic Bragg Grating Sensor Based on a Defect Metal-Insulator-Metal Waveguide.

Shinian Qu1, Ci Song2, Xiushan Xia3

  • 1School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi 214122, China. qu.shinian@163.com.

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|May 31, 2016
PubMed
Summary

Researchers developed a nanoscale Bragg grating reflector in a metal-insulator-metal (MIM) waveguide. This tunable device controls light at sub-wavelength scales, enabling advanced optical sensor designs.

Keywords:
Bragg grating sensorfinite element methodmetal-insulator-metalplasmonics

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Surface plasmon polariton (SPP) technology enables light manipulation at deep sub-wavelength scales.
  • Metallic waveguide structures offer unique optical properties for device applications.

Purpose of the Study:

  • To develop and numerically simulate a nanoscale Bragg grating reflector.
  • To investigate the tunable optical properties of a defect metal-insulator-metal (MIM) waveguide structure.

Main Methods:

  • Finite element method (FEM) for numerical simulation.
  • Design and analysis of a defect MIM waveguide with a Bragg grating reflector.

Main Results:

  • A highly tunable, broad stop-band in transmission spectra was achieved.
  • A narrow transmission window was observed and controlled by altering geometrical parameters.
  • Central wavelengths were easily controlled by modifying geographical parameters.

Conclusions:

  • The developed MIM-based Bragg grating reflector offers precise control over light at the nanoscale.
  • The structure's ability to break the diffraction limit is advantageous for optical sensor design.