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Miniature microring resonator sensor based on a hybrid plasmonic waveguide.

Linjie Zhou1, Xiaomeng Sun, Xinwan Li

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. ljzhou@sjtu.edu.cn

Sensors (Basel, Switzerland)
|December 14, 2011
PubMed
Summary

We developed a compact microring resonator sensor using a hybrid plasmonic waveguide. This novel sensor offers high sensitivity and a small footprint for efficient biochemical sensing applications.

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Area of Science:

  • Photonics and Plasmonics
  • Biochemical Sensing
  • Nanotechnology

Background:

  • Microring resonators are widely used in sensing applications.
  • Existing dielectric microring resonators face limitations in sensitivity and footprint.
  • Hybrid plasmonic waveguides offer enhanced light confinement and interaction.

Purpose of the Study:

  • To propose and analyze a novel compact microring resonator sensor.
  • To leverage a hybrid plasmonic waveguide for enhanced biochemical sensing.
  • To investigate the sensor's sensitivity and compactness.

Main Methods:

  • Design of a hybrid plasmonic waveguide (metal-gap-silicon structure).
  • Numerical analysis using the finite element method (FEM).
  • Evaluation of optical characteristics for biochemical sensing.
Keywords:
resonatorssensorssurface plasmon resonance

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Main Results:

  • The hybrid microring resonator achieves a compact 1-μm radius.
  • High sensitivity due to significant optical field overlap with the sensing medium.
  • Compactness achieved by balancing bending radiation loss and metal absorption loss.

Conclusions:

  • The proposed hybrid microring resonator sensor exhibits a small footprint and high sensitivity.
  • It offers superior performance compared to traditional dielectric microring resonators.
  • Potential for integration into lab-on-chip devices for efficient biochemical sensing arrays.