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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Refractometric sensor utilizing a vertically coupled polymeric microdisk resonator incorporating a high refractive

Gun-Duk Kim1, Geun-Sik Son, Hak-Soon Lee

  • 1Department of Electronic Engineering, Kwangwoon University, Seoul, Korea.

Optics Letters
|April 3, 2009
PubMed
Summary

This study presents a novel refractometric sensor using a microdisk resonator coated with titanium dioxide (TiO2) for enhanced refractive index (RI) detection. The sensor achieved a 150% sensitivity improvement, demonstrating its potential for precise analyte analysis.

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Area of Science:

  • Photonics
  • Nanotechnology
  • Chemical Sensing

Background:

  • Refractometric sensors are crucial for detecting changes in analyte refractive index (RI).
  • Polymeric microdisk resonators offer a platform for sensitive optical measurements.
  • Titanium dioxide (TiO2) coatings can enhance light-matter interactions.

Purpose of the Study:

  • To develop and characterize a refractometric sensor based on a vertically coupled polymeric microdisk resonator.
  • To investigate the effect of a high refractive index TiO2 overlay on sensor performance.
  • To optimize sensor sensitivity by adjusting the TiO2 overlay thickness.

Main Methods:

  • Fabrication of a polymeric microdisk resonator.
  • Coating the resonator with a thin film of titanium dioxide (TiO2).
  • Characterization of the sensor's transfer characteristics and resonant wavelength shifts.
  • Theoretical and experimental analysis of sensor sensitivity.

Main Results:

  • The sensor's sensitivity was significantly enhanced by the TiO2 overlay.
  • Maximum sensitivity of approximately 294 nm/RIU was achieved with a 40-nm TiO2 overlay.
  • This represents a 150% improvement in sensitivity compared to the uncoated resonator.
  • The evanescent field interaction with the analyte was effectively reinforced.

Conclusions:

  • The TiO2-overlaid polymeric microdisk resonator is a highly sensitive refractometric sensor.
  • Adjusting the TiO2 overlay thickness is a viable strategy for enhancing sensor performance.
  • This technology holds promise for advanced applications in chemical sensing and diagnostics.