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Updated: May 24, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators
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Published on: July 2, 2012

Germanium microsphere high-Q resonator.

Pengfei Wang1, Timothy Lee, Ming Ding

  • 1Optoelectronics Research Centre, University of Southampton, Southampton, UK. pw3y09@orc.soton.ac.uk

Optics Letters
|February 21, 2012
PubMed
Summary
This summary is machine-generated.

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Researchers fabricated germanium microsphere resonators, observing high-quality whispering gallery modes near 2 μm. These resonators show promise for advanced optical processing devices, especially at longer wavelengths.

Area of Science:

  • Materials Science
  • Optical Engineering
  • Nanotechnology

Background:

  • Microsphere resonators are crucial for various optical applications.
  • Germanium's unique optical properties, including high nonlinearity and broad transparency, make it a promising material for photonic devices.

Purpose of the Study:

  • To demonstrate the fabrication and characterization of germanium microsphere resonators.
  • To investigate the excitation of whispering gallery modes in these resonators.
  • To assess their potential for optical processing applications.

Main Methods:

  • Fabrication of a 46 μm diameter germanium microsphere resonator.
  • Excitation of whispering gallery modes using evanescent coupling from a tapered silica optical fiber (2 μm waist diameter).

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Last Updated: May 24, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators
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Published on: July 2, 2012

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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  • Characterization of resonance properties and Q factors.

    • Main Results:

    • Successfully fabricated germanium microsphere resonators.
    • Observed whispering gallery modes with high Q factors (up to 3.8×10^4) near 2 μm wavelengths.
    • Demonstrated efficient coupling using a tapered silica fiber.

    Conclusions:

    • Germanium microsphere resonators can be fabricated and characterized effectively.
    • These resonators exhibit high-quality optical resonances suitable for photonic applications.
    • Their properties make them ideal for optical processing devices, particularly at long wavelengths around 2 μm.