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

Microcavities combining a semiconductor with a fused-silica microsphere.

X Fan1, S Lacey, H Wang

  • 1Department of Physics and Oregon Center for Optics, University of Oregon, Eugene, Oregon 97403, USA.

Optics Letters
|December 13, 2007
PubMed
Summary

This study introduces a new microcavity system merging semiconductor quantum wells and microspheres. Efficient coupling of excitonic photoluminescence into whispering-gallery modes was achieved, yielding high Q factors exceeding 10^5.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Quantum Electronics

Background:

  • Whispering-gallery mode resonators are crucial for integrated optics.
  • Semiconductor quantum wells offer unique optoelectronic properties.
  • Efficient coupling between quantum emitters and optical modes is a key challenge.

Purpose of the Study:

  • To investigate the coupling efficiency between a semiconductor quantum well and a fused-silica microsphere.
  • To characterize the optical properties of this novel microcavity system.
  • To determine the feasibility of using such systems for advanced photonic applications.

Main Methods:

  • Fabrication of a hybrid microcavity system combining a semiconductor quantum well and a fused-silica microsphere.
  • Excitation of excitonic photoluminescence in the quantum well.
  • Utilizing resonant light-scattering techniques to measure system properties.
  • Analysis of the influence of semiconductor nanostructure capping layer thickness.

Main Results:

  • Demonstrated efficient coupling of excitonic photoluminescence into whispering-gallery modes.
  • Achieved a high Q factor exceeding 10^5 for the microcavity system.
  • Identified the critical role of thin capping layers (a few nanometers) for semiconductor nanostructures.

Conclusions:

  • The novel microcavity system exhibits efficient light-matter interaction.
  • High Q factors are achievable, indicating potential for sensitive photonic devices.
  • Precise control over semiconductor nanostructure interfaces is essential for optimal performance.