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Updated: Jun 22, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Published on: August 5, 2013

Universal coupling between metal-clad waveguides and optical ring resonators.

Ian M White, Jonanthan D Suter, Hesam Oveys

|June 18, 2009

Summary

We developed a new gold-clad waveguide to excite whispering gallery modes in optical ring resonators. This method offers improved light coupling and lower transmission loss for broader applications.

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Area of Science:

Photonics
Optical Engineering
Materials Science

Background:

Whispering gallery modes (WGMs) are crucial for optical resonators.
Efficiently coupling light into these resonators is a key challenge.
Existing methods like anti-resonant reflecting optical waveguide (ARROW) structures have limited bandwidth.

Purpose of the Study:

To demonstrate a novel method for exciting WGMs in optical ring resonators.
To improve light-coupling efficiency and reduce transmission loss.
To enhance the practicality of optical ring resonators for various applications.

Main Methods:

Fabrication of a gold-clad pedestal planar waveguide structure.
Utilizing the evanescent field of the waveguide for light coupling.
Designing the pedestal waveguide height to optimize coupling conditions.

Main Results:

Successful excitation of WGMs in optical ring resonators.
Demonstrated strong evanescent field for efficient light coupling.
Achieved low transmission loss across visible and near-infrared spectrum.
Showcased design flexibility of pedestal waveguide height for optimized coupling.

Conclusions:

The gold-clad waveguide structure is a practical and efficient method for exciting WGMs.
This technology offers advantages over previous ARROW structures due to broader bandwidth and lower loss.
The developed technique significantly enhances the utility of optical ring resonators in sensing, lasers, and other fields.