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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Whispering-Gallery Mode Micro-Ring Resonator Integrated with a Single-Core Fiber Tip for Refractive Index Sensing.

Monika Halendy1, Sławomir Ertman1

  • 1Faculty of Physics, Warsaw University of Technology, 00-662 Warszawa, Poland.

Sensors (Basel, Switzerland)
|December 9, 2023
PubMed
Summary

A novel micro-ring resonator on a fiber tip enables refractive index sensing. This simple, fiber-integrated device offers convenient, reflection-mode measurements for various applications.

Keywords:
micro-ring resonatoroptical fiberrefractive indexsensortwo-photon polymerization (2PP)whispering-gallery mode (WGM)

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Area of Science:

  • Photonics and optical sensing
  • Micro- and nanostructure fabrication
  • Fiber optic sensors

Background:

  • Whispering-gallery mode (WGM) resonators are sensitive to environmental refractive index changes.
  • Integrating resonators onto fiber tips simplifies optical setups and enhances measurement convenience.
  • Existing fiber-optic sensing methods may lack simplicity or require complex configurations.

Purpose of the Study:

  • To fabricate and characterize a micro-ring resonator on a single-mode fiber tip for refractive index sensing.
  • To demonstrate the potential of WGMs in a fiber-tip resonator for sensing applications.
  • To highlight the advantages of a simple, reflection-mode sensing design.

Main Methods:

  • Fabrication of a micro-ring resonator using two-photon polymerization directly on a single-mode fiber tip.
  • Excitation of whispering-gallery modes within the micro-ring structure.
  • Monitoring shifts in the resonance spectrum in response to changes in the surrounding refractive index.

Main Results:

  • Successful fabrication of a micro-ring resonator integrated onto a fiber tip.
  • Demonstration of refractive index sensing based on shifts in the WGM resonance spectrum.
  • Characterization of the sensor's performance, showing high potential for refractive index detection.

Conclusions:

  • The fiber-tip micro-ring resonator is a promising platform for simple and efficient refractive index sensing.
  • The reflection-mode operation and fiber integration offer significant advantages for practical optical sensing.
  • Further research can explore advanced functionalities and applications of this sensing structure.