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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Numerical study of opto-fluidic ring resonators for biosensor applications.

Han Keun Cho1, Jinwoo Han

  • 1Department of Biosystems Engineering, Chungbuk National University, Cheongju 361-763, Korea. hkcho@cbu.ac.kr

Sensors (Basel, Switzerland)
|December 4, 2012
PubMed
Summary

This study numerically characterizes opto-fluidic ring resonator (OFRR) biosensors in whispering gallery mode (WGM). Optimal waveguide width is identified for enhanced biosensor performance.

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Area of Science:

  • Photonics
  • Nanotechnology
  • Biosensing

Background:

  • Opto-fluidic ring resonators (OFRRs) are advanced photonic devices utilized in biosensing.
  • Whispering gallery mode (WGM) operation is crucial for OFRR sensitivity.

Purpose of the Study:

  • To numerically characterize OFRR biosensors operating in WGM.
  • To investigate the impact of resonator size parameters on WGM characteristics.
  • To identify optimal design parameters for enhanced biosensor performance.

Main Methods:

  • Numerical characterization using the finite element method (FEM) with COMSOL Multiphysics.
  • Solving Maxwell's equations to simulate OFRR behavior.
  • Analysis of resonance frequencies, FSR, FWHM, finesse, and Q factor.

Main Results:

  • Resonant frequencies are primarily influenced by ring diameter; other parameters have negligible effects.
  • FWHM, Q factor, and finesse are most sensitive to gap width, followed by ring diameter, waveguide width, and ring thickness.
  • An optimal waveguide width range (2.25–2.75 μm) was identified for the studied OFRR.

Conclusions:

  • The study provides critical insights into OFRR design optimization for biosensing applications.
  • Understanding parameter dependencies allows for the development of more sensitive and efficient biosensors.
  • The identified optimal waveguide width is key for maximizing OFRR performance.