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Loss engineered slow light waveguides.

L O'Faolain¹, S A Schulz, D M Beggs

¹School of Physics and Astronomy, SUPA, University of St Andrews, Fife, United Kingdom.

|January 4, 2011

Summary

This summary is machine-generated.

Researchers explain extrinsic loss in photonic crystal waveguides (PhCW). A new model reveals coherent scattering, enabling lower propagation losses for advanced optical signal processing.

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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

Area of Science:

Photonics
Optical Engineering
Materials Science

Background:

Slow light devices like photonic crystal waveguides (PhCW) and coupled resonator optical waveguides (CROW) show promise for optical signal processing.
Propagation losses, particularly at higher group indices, limit the performance of these devices.
Extrinsic losses, caused by scattering from technological imperfections, are a major contributor to signal degradation.

Purpose of the Study:

To provide a comprehensive explanation of extrinsic loss mechanisms in PhC waveguides.
To address misconceptions regarding the relationship between loss and slow light.
To develop a theoretical model for accurately predicting PhC waveguide loss spectra.

Main Methods:

Development of a theoretical model to explain extrinsic loss mechanisms in PhC waveguides.
Analysis of light scattering processes within PhCW, considering coherent contributions from the entire waveguide structure.
Experimental realization of PhCW with reduced propagation losses.

Main Results:

A novel theoretical model accurately describes PhC waveguide loss spectra.
The model demonstrates that the entire waveguide hole contributes coherently to scattering, differing from previous incoherent models.
Achieved significantly lower propagation losses in realized waveguides compared to similar PhCW and state-of-the-art CROW devices.

Conclusions:

The developed model provides a deeper understanding of extrinsic loss in PhC waveguides.
Coherent scattering is a key factor influencing loss in PhCW.
This work enables the design of advanced PhCW with reduced losses for improved optical signal processing applications.