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Related Experiment Video

Updated: May 29, 2026

Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Fabrication and Testing of Microfluidic Optomechanical Oscillators

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Optically tunable microfiber-knot resonator.

Zhe Chen1, Vincent K S Hsiao, Xiaoqing Li

  • 1Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Educational Institutes, Jinan University, Guangzhou 510632, China.

Optics Express
|September 22, 2011
PubMed
Summary

This study shows how UV light can tune optical spectra using a microfiber-knot resonator coated with a photoresponsive liquid crystal (LC) mixture. This method allows for repeatable and reversible spectral shifting of resonance wavelengths.

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Area of Science:

  • Photonics
  • Materials Science
  • Optical Engineering

Background:

  • Microfiber-knot resonators offer high-quality optical resonance.
  • Photoresponsive liquid crystals can alter optical properties upon light exposure.

Purpose of the Study:

  • To demonstrate light-induced tuning of optical spectra using a microfiber-knot resonator coated with a photoresponsive liquid crystal mixture.
  • To investigate the spectral shifting capabilities and reversibility of such a device.

Main Methods:

  • Fabrication of a high-quality microfiber-knot resonator from a single-mode fiber.
  • Coating the resonator with a photoresponsive liquid crystal mixture containing azobenzene molecules, a chiral dopant, and a nematic LC.
  • Irradiation with UV light to induce changes in the optical spectrum.

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Last Updated: May 29, 2026

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Main Results:

  • Observed noticeable changes in peak resonance wavelengths upon UV light irradiation.
  • Associated spectral shifts with local changes in the refractive index of the liquid crystal layer.
  • Demonstrated repeatable and reversible spectral shifting of 0.15 nm using 50 mW/cm² UV light.

Conclusions:

  • Light-induced tuning of optical spectra is achievable with microfiber-knot resonators functionalized with photoresponsive liquid crystals.
  • The refractive index modulation in the liquid crystal layer is the primary mechanism for spectral shifting.
  • The developed system offers potential for tunable optical devices and sensors.