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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Microfluidic sensor based on integrated optical hollow waveguides.

Stefania Campopiano1, Romeo Bernini, Luigi Zeni

  • 1Department of Information Engineering, Seconda Università di Napoli, Via Roma 29, 81031 Aversa, Italy. stefania.campopiano@unina2.it

Optics Letters
|September 11, 2004
PubMed
Summary

This study introduces a simple optical sensor using hollow-core antiresonant reflecting optical waveguides to measure liquid refractive index. It offers a linear response and high resolution for small analyte volumes.

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Area of Science:

  • Photonics and optical sensing
  • Integrated optics
  • Materials science

Background:

  • Refractive index sensing is crucial for chemical and biological analysis.
  • Existing methods often require complex instrumentation or large sample volumes.
  • Integrated optical waveguides offer miniaturization potential for sensing applications.

Purpose of the Study:

  • To propose and demonstrate a simple integrated optical refractometric sensor.
  • To utilize the antiresonant reflecting optical waveguide (AROW) mechanism for sensing.
  • To enable refractive index measurement of liquids by spectral analysis.

Main Methods:

  • Fabrication of the sensor using standard silicon technology.
  • Experimental validation of numerical simulations in 1D and 2D.
  • Monitoring the transmitted spectrum of light through the hollow core.

Main Results:

  • The sensor demonstrated a linear response across a wide refractive index range (1.3330-1.4450).
  • Achieved a high resolution of 9 x 10(-4).
  • Confirmed the sensor's capability with small analyte volumes.

Conclusions:

  • The proposed AROW-based sensor is a simple and effective tool for refractometric measurements.
  • The silicon-based integrated platform offers practical advantages for sensor fabrication.
  • This technology holds promise for miniaturized and high-performance optical sensing.