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Related Experiment Videos

Liquid-core optical ring-resonator sensors.

Ian M White1, Hesam Oveys, Xudong Fan

  • 1Department of Biological Engineering, University of Missouri-Columbia, Missouri 65211, USA.

Optics Letters
|April 28, 2006
PubMed
Summary
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A new liquid-core optical ring-resonator (LCORR) sensor uses a capillary for fluid delivery and sensing. This novel sensor architecture demonstrates high spectral sensitivity for refractive index changes.

Area of Science:

  • Photonics
  • Optical Sensors
  • Microfluidics

Background:

  • Optical ring resonators offer high sensitivity for sensing applications.
  • Integrating microfluidics with optical resonators is crucial for compact sensor development.

Purpose of the Study:

  • To demonstrate a novel liquid-core optical ring-resonator (LCORR) sensor architecture.
  • To characterize the spectral sensitivity of the LCORR sensor.

Main Methods:

  • Fabrication of a fused silica capillary-based LCORR with micrometer-thin walls.
  • Optical characterization using a water-ethanol mixture to determine spectral sensitivity.
  • Development of a Mie theory-based model to explain experimental observations.

Main Results:

Related Experiment Videos

  • The LCORR sensor exhibited a spectral sensitivity of approximately 2.6 nm per refractive index unit.
  • The sensor design effectively couples whispering gallery modes to the aqueous core.
  • Experimental results were well-explained by the established Mie theory model.

Conclusions:

  • The LCORR sensor architecture combines the benefits of ring resonators and capillary fluidics.
  • This technology offers high sensitivity, a small footprint, and low sample consumption.
  • The LCORR sensor platform is suitable for future development of multiplexed sensor arrays.