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Related Experiment Video

Updated: Feb 4, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Ultra-wide-band structural slow light.

Yiming Lai^1,2, Mohamed Sabry Mohamed³, Boshen Gao⁴

¹Department of Physics University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.

Scientific Reports

|October 6, 2018

Summary

Researchers achieved a record group-index-bandwidth product in integrated photonics using optimized coupled-cavity-waveguides. This advancement is crucial for developing complex, miniature light-controlling chips for future photonic circuits.

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Area of Science:

Integrated photonics
Nanophotonics
Optical engineering

Background:

Integrated photonics enables miniaturization of optical components on a single chip.
Current integrated photonic circuits lack the complexity of electronic circuits.
Slow light propagation is essential for phase control and enhanced nonlinearities in photonic devices.

Purpose of the Study:

To experimentally demonstrate a record high group-index-bandwidth product (GBP) in coupled-cavity-waveguides (CCWs).
To advance the development of chip-integrated photonic devices for enhanced light control.

Main Methods:

Fabrication of genetically optimized CCWs using L3 photonic crystal cavities in silicon-on-insulator slabs.
Integration of up to 800 coupled cavities.
Characterization via transmission, Fourier-space imaging of mode dispersion, and Mach-Zehnder interferometry.

Main Results:

Achieved a record group-index-bandwidth product (GBP) of 0.47.
Demonstrated this performance over a 17.7 nm bandwidth.
Utilized optimized coupled-cavity-waveguides for enhanced light manipulation.

Conclusions:

The demonstrated GBP represents a significant advancement for integrated photonic devices.
Optimized CCWs in silicon-on-insulator are a promising platform for complex photonic circuits.
This work paves the way for more sophisticated on-chip light-controlling functionalities.