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Updated: Jun 24, 2026
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Fabrication of Silica Ultra High Quality Factor Microresonators
Published on: July 2, 2012
Submicrometer diameter micropillar cavities with high quality factor and ultrasmall mode volume
1School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA. yinan@seas.harvard.edu
Optics Letters
|April 3, 2009
Summary
Researchers developed high-quality micropillar cavities using TiO2/SiO2, achieving a record low mode volume. This breakthrough enables advanced cavity quantum electrodynamics experiments in the strong coupling limit.
Area of Science:
- Optics and Photonics
- Quantum Information Science
- Materials Science
Background:
- Micropillar cavities are crucial for light-matter interactions.
- Existing cavities often struggle to balance high quality factors (Q) with small mode volumes (V).
- Achieving a high Q/V ratio is essential for strong light-matter coupling.
Purpose of the Study:
- To theoretically demonstrate novel micropillar cavities with enhanced performance.
- To explore the potential of the TiO2/SiO2 material system for optical resonators.
- To establish a viable platform for cavity quantum electrodynamics (cQED) experiments.
Main Methods:
- Theoretical modeling and simulation of TiO2/SiO2 micropillar cavities.
- Analysis of cavity quality factor (Q) and mode volume (V) parameters.
- Integration of a diamond nanocrystal within the cavity model.
Main Results:
- Demonstrated micropillar cavities with a high Q factor (~3x10^6).
- Achieved a record low mode volume (V ~0.1(λ/n)^3).
- Obtained a Q/V ratio three orders of magnitude greater than previous reports.
Conclusions:
- The TiO2/SiO2 material system offers a promising route to high-performance optical cavities.
- The demonstrated cavities provide an unprecedented Q/V ratio, ideal for cQED.
- This platform facilitates cavity quantum electrodynamics experiments in the strong coupling regime.
