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Related Experiment Video

Updated: Jun 5, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Free-space-coupled wavelength-scale disk resonators.

Babak Mirzapourbeinekalaye¹, Sarath Samudrala¹, Mahdad Mansouree¹

¹Department of Electrical and Computer Engineering, University of Massachusetts Amherst, 151 Holdsworth Way, Amherst, MA 01003, USA.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

This summary is machine-generated.

Researchers developed a new model for optical microresonators, showing stored energy depends on quality factor and directivity. This led to a microdisk design efficiently coupled to free-space waves for applications like sensing and micro-lasers.

Keywords:

flat optics free space coupling microresonators

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Area of Science:

Optics and Photonics
Materials Science

Background:

Optical microresonators with high quality factors are typically difficult to excite with freely propagating optical waves.
Efficient coupling is crucial for many photonic applications.

Purpose of the Study:

To present a universal model for optical resonators interacting with freely propagating waves.
To design and demonstrate a microdisk resonator with efficient free-space coupling.

Main Methods:

Developed a theoretical model relating resonator stored energy to quality factor and directivity.
Designed microdisk resonators with periodic protrusions on their circumference.
Experimentally fabricated and characterized microdisk resonators with high quality factors.

Main Results:

Demonstrated that stored energy is proportional to the product of quality factor and directivity.
Showcased microdisk designs with efficient coupling to normally incident plane waves.
Observed thermally-induced bistability at low input powers (0.7 mW) in a microdisk with Q = 15,000.

Conclusions:

Wavelength-scale, free-space-coupled microdisks offer strong excitation and are suitable for sensing, emission enhancement, and nonlinear optics.
The developed model provides a guideline for designing efficient microresonators.
These microdisks are promising for integrated photonic devices and micro-laser cavities.