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Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Super free spectral range tunable optical microbubble resonator.

M Sumetsky1, Y Dulashko, R S Windeler

  • 1OFS Laboratories, 19 Schoolhouse Road, Somerset, New Jersey 08873, USA. sumetski@ofsoptics.com

Optics Letters
|June 3, 2010
PubMed
Summary
This summary is machine-generated.

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Researchers developed a mechanically tunable optical resonator using a silica microbubble. This novel device achieves a tunable bandwidth over twice its free spectral range (FSR), enhancing optical resonance control.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Optical resonators are crucial for various photonic applications.
  • Achieving broad tunability in high-Q-factor microresonators, such as spheroidal and toroidal types, is challenging.
  • The azimuthal free spectral range (FSR) defines the characteristic mode interval for these resonators.

Purpose of the Study:

  • To demonstrate the first mechanically fully tunable spheroidal microresonator.
  • To explore tunability exceeding the azimuthal free spectral range (FSR) in microresonators.
  • To utilize a silica microbubble as the base material for the tunable resonator.

Main Methods:

  • Fabrication of a spheroidal microresonator from a silica microbubble with micrometer-scale dimensions.
  • Mechanical manipulation to achieve tunability of the optical resonator.

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Last Updated: Jun 12, 2026

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  • Characterization of the resonator's tunable bandwidth and comparison with its azimuthal FSR.

    • Main Results:

    • Successful creation of a mechanically fully tunable spheroidal microresonator.
    • The resonator exhibits a tunable bandwidth more than two times greater than its azimuthal FSR.
    • The device utilizes a silica microbubble with a radius of approximately 100 micrometers and a wall thickness of approximately 1 micrometer.

    Conclusions:

    • The developed silica microbubble resonator represents a significant advancement in tunable optical microcavities.
    • This technology offers enhanced control over optical resonances, surpassing previous limitations.
    • The findings pave the way for new applications in tunable photonics and sensing.