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Hollow Fiber Coupler Sensor.

Nithin Kuruba1, Tao Lu2

  • 1Department of Electrical and Computer Engineering, University of Victoria, Victoria, BC V8P 5C2, Canada. nithu.everyyear@gmail.com.

Sensors (Basel, Switzerland)
|February 21, 2019
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Summary
This summary is machine-generated.

A novel bi-conical optical directional coupler detects liquid refractive index and temperature. This fiber optic sensor demonstrates high sensitivity and resolution for precise liquid analysis.

Keywords:
biosensordirectional couplerhollow core fiber

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Area of Science:

  • Optoelectronics
  • Fiber optics
  • Chemical sensing

Background:

  • Optical directional couplers are key components in photonic integrated circuits.
  • Evanescent wave coupling is a sensitive mechanism for detecting changes in the surrounding medium.
  • Accurate measurement of liquid refractive index and temperature is crucial in various scientific and industrial applications.

Purpose of the Study:

  • To develop and demonstrate a bi-conical optical directional coupler for sensing liquid properties.
  • To investigate the use of evanescent wave coupling for simultaneous refractive index and temperature detection.
  • To evaluate the sensitivity and resolution of the developed fiber optic sensor.

Main Methods:

  • Fabrication of a bi-conical optical directional coupler using solid and hollow core fibers.
  • Utilizing evanescent wave coupling for interaction with the liquid medium.
  • Experimental measurement of output optical power variations in response to changes in liquid refractive index and temperature.

Main Results:

  • The sensor successfully detected changes in liquid refractive index and temperature.
  • Achieved a sensitivity of 4.03 ± 0.50 volts per refractive index unit (V/RIU).
  • Demonstrated a resolution of 3.5 × 10^-3 refractive index units (RIU) for refractive indices between 1.331 and 1.403.

Conclusions:

  • The bi-conical optical directional coupler is a viable platform for liquid sensing.
  • The evanescent wave coupling mechanism enables sensitive detection of refractive index and temperature.
  • The developed sensor exhibits promising performance for practical applications in liquid analysis.