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Updated: May 12, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Whispering gallery mode microsphere resonator integrated inside a microstructured optical fiber.

Kyriaki Kosma¹, Gianluigi Zito, Kay Schuster

¹Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure and Laser (IESL), P.O. Box 1315, Heraklion 71 110, Greece.

|April 19, 2013

Summary

Researchers demonstrate a novel method for exciting whispering gallery mode (WGM) resonances in polymer microspheres using microstructured optical fibers. This compact system achieves efficient excitation and reproducible results for WGM spectroscopy applications.

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Area of Science:

Optics and Photonics
Materials Science

Background:

Whispering gallery mode (WGM) resonators are crucial for various photonic applications.
Efficient and reproducible excitation of WGMs in microspheres remains a challenge.

Purpose of the Study:

To demonstrate a compact and robust scheme for broadband excitation of WGM resonances.
To integrate polymer microspheres with microstructured optical fibers for enhanced WGM excitation.

Main Methods:

Encapsulation of a 10 μm polymer microsphere within the capillary of a microstructured optical fiber.
Utilizing two distinct launch/collection schemes: core input/scattering output and sphere input/core output.
Experimental characterization and numerical simulation of WGM spectra.

Main Results:

Achieved efficient and reproducible excitation of the in-fiber microsphere resonator.
Demonstrated external excitation of microsphere WGMs via the sphere input/core output scheme.
Measured quality (Q) factors in the range of 10^3, with good agreement between experimental and numerical WGM spectra.

Conclusions:

The developed scheme offers a compact, robust, and efficient method for WGM excitation in microspheres.
This technique facilitates advanced applications in sensing and optical communication.
The integration of microspheres with microstructured optical fibers presents a promising platform for photonic devices.