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Related Experiment Video

Updated: Feb 24, 2026

Label-free Single Molecule Detection Using Microtoroid Optical Resonators
08:53

Label-free Single Molecule Detection Using Microtoroid Optical Resonators

Published on: December 29, 2015

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Optical Ring Resonators: A Platform for Biological Sensing Applications.

Azadeh Kiani Sarkaleh1, Babak Vosoughi Lahijani2, Hamidreza Saberkari2

  • 1Department of Electrical Engineering, Rasht Branch, Islamic Azad University, Rasht, Iran.

Journal of Medical Signals and Sensors
|August 26, 2017
PubMed
Summary
This summary is machine-generated.

Optical ring resonators enhance food safety by detecting DNA and proteins. A new nanogap design in all-pass resonators significantly improves sensitivity for biosensing applications.

Keywords:
Active layerDNA moleculeoptical resonatorssensitivity

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Area of Science:

  • Biochemistry and Genetics
  • Food Safety and Public Health
  • Optical Biosensing

Background:

  • Advances in biochemistry and genetics drive medical instrument development for detection and prevention.
  • Food safety is a critical public health concern, necessitating reliable detection methods.
  • Optical ring resonators offer a robust platform for detecting bioparticles like DNA and proteins, crucial for food authenticity.

Purpose of the Study:

  • To evaluate the sensing performance of two optical ring resonator structures: all-pass and add-drop resonators.
  • To propose and investigate a novel all-pass ring resonator configuration incorporating a nanogap for enhanced sensing capabilities.
  • To compare the sensitivity of the proposed nanogap all-pass resonator with the standard add-drop configuration for biosensing.

Main Methods:

  • Utilizing the finite difference time domain (FDTD) paradigm for optical simulations.
  • Simulating the spectral response shifts of optical ring resonators upon deposition of a target particle.
  • Analyzing the sensitivity of all-pass and add-drop ring resonator configurations with and without a nanogap.

Main Results:

  • Simulation results indicate that the introduction of a nanogap in the all-pass ring resonator configuration significantly increases sensitivity.
  • The nanogap all-pass ring resonator demonstrated superior performance compared to the standard add-drop resonator for sensing applications.
  • The spectral shift is directly correlated with the presence of target bioparticles.

Conclusions:

  • The nanogap all-ring resonator configuration is highly suitable for advanced biosensing applications.
  • This improved sensitivity is critical for accurate detection of bioparticles in food safety and authenticity testing.
  • Further research can explore optimizing nanogap dimensions for even greater detection capabilities.