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Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
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Whispering Gallery Mode Dip Sensor for Aqueous Sensing.

Monica Agarwal1, Iwao Teraoka1

  • 1Department of Chemical and Biomolecular Engineering, Polytechnic School of Engineering, New York University , 6 MetroTech Center, Brooklyn, New York 11201, United States.

Analytical Chemistry
|September 22, 2015
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Summary
This summary is machine-generated.

A novel, compact whispering gallery mode (WGM) sensor was developed for aqueous solutions. This robust photonic sensor offers reproducible measurements, even after repeated immersion and retrieval, with integrated temperature monitoring.

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Area of Science:

  • Photonics
  • Sensor Technology
  • Analytical Chemistry

Background:

  • Whispering gallery mode (WGM) sensors are valuable for detecting changes in refractive index.
  • Conventional WGM sensors often require complex planar arrangements.
  • Developing robust, easily deployable WGM sensors is crucial for practical applications.

Purpose of the Study:

  • To fabricate a compact, preassembled, and reusable whispering gallery mode (WGM) sensor.
  • To achieve high sensitivity comparable to planar WGM sensors in a novel configuration.
  • To demonstrate the sensor's reliability in aqueous solutions with integrated temperature compensation.

Main Methods:

  • Fabrication of a 4 mm thick WGM sensor by bending an optical fiber and molding its tip into a sphere.
  • Integration of cone-tipped tapers to couple light to the WGM sensor.
  • Inclusion of a thermistor within the sensor head for temperature monitoring.
  • Repeated dipping and lifting of the sensor in aqueous solutions (water and sucrose).

Main Results:

  • The developed sensor exhibits a resonance wavelength shift sensitivity comparable to conventional planar WGM sensors.
  • Temperature variations due to solution transfer were monitored and corrected.
  • Resonance shifts were reproducible across repeated measurements in different sucrose concentrations.
  • Experimental results align with theoretical predictions for wavelength shifts.

Conclusions:

  • A viable, compact, and preassembled photonic sensor based on WGM principles has been successfully fabricated.
  • The sensor demonstrates robust performance and reproducibility in aqueous environments.
  • The integrated temperature monitoring ensures accurate measurements, making it suitable for repeated use in solution analysis.