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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Tunable Whispering Gallery Mode Photonic Device Based on Microstructured Optical Fiber with Internal Electrodes.

Tatiana Muñoz-Hernández1, Erick Reyes-Vera2,3, Pedro Torres4

  • 1Escuela de Física, Universidad Nacional de Colombia, sede Medellín, Medellín, Colombia.

Scientific Reports
|August 21, 2019
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Summary

We developed a novel tunable whispering gallery mode (WGM) photonic device using side-hole microstructured optical fiber (SH-MOF) with internal electrodes. This device maintains high quality factors while enabling temperature-controlled WGM redshift for photonic applications.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Whispering gallery mode (WGM) resonators are crucial for integrated photonics.
  • Tuning WGM resonators often leads to a decrease in quality factor.
  • Developing stable and tunable WGM devices is essential for advanced optical applications.

Purpose of the Study:

  • To propose and demonstrate the first tunable WGM photonic device utilizing side-hole microstructured optical fiber (SH-MOF) with internal electrodes.
  • To investigate the thermal tuning properties of WGMs in SH-MOF devices with internal electrodes.
  • To ensure high WGM quality factors are maintained during the tuning process.

Main Methods:

  • Fabrication of SH-MOF with integrated internal electrodes.
  • Experimental characterization of WGM resonance shifts with temperature changes.
  • A two-stage computational methodology to model thermal tuning, including metal filling effects.

Main Results:

  • Demonstration of a tunable WGM photonic device based on SH-MOF with internal electrodes.
  • Observed redshift of resonant modes with increasing temperature.
  • Experimental results show excellent agreement with theoretical predictions, with a linear shift rate.
  • High WGM quality factors were maintained during thermal tuning.

Conclusions:

  • The developed tunable SH-MOF microresonator with internal electrodes offers stable WGM tuning.
  • The device exhibits predictable thermal tuning characteristics.
  • Potential applications include optical filtering, switching, and highly integrated tunable photonic systems.