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Multimode resonances in square-shaped optical microcavities.

A W Poon, F Courvoisier, R K Chang

|November 28, 2007

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Researchers studied square-shaped optical microcavities for dense wavelength-division multiplexing filters. They observed multimode resonances in larger microcavities, suggesting smaller ones may offer single-mode filtering.

Area of Science:

Optics and Photonics
Materials Science

Background:

Optical microcavities are crucial for wavelength-division multiplexing.
Two-dimensional square microcavities offer potential for novel filter applications.

Purpose of the Study:

Investigate square-shaped optical microcavities for dense wavelength-division multiplexing (DWDM) filter applications.
Analyze cavity resonances and mode behavior in two-dimensional microcavities.

Main Methods:

Fabrication of square-shaped microcavities in fused silica.
Elastic scattering measurements to observe cavity resonances.
Two-dimensional k-space analysis to model cavity modes and trajectories.

Main Results:

Observed multimode cavity resonances in approximately 200-microm square microcavities.

Related Experiment Videos

Mode spectrum explained by normal modes and total internal reflection.

Cavity-mode trajectories do not require closure after each round trip.

Conclusions:

Square-shaped microcavities exhibit multimode behavior.
Smaller microcavities are predicted to yield single-mode spectra, suitable for DWDM filters.
The study provides insights into optical microcavity design for telecommunications.