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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Establishing the nonlinear coefficient for extremely lossy waveguides.

Gordon Han Ying Li, Alessandro Tuniz, C Martijn de Sterke

|September 15, 2020

Summary

This summary is machine-generated.

This study identifies the most accurate method for calculating the nonlinear coefficient (γ) in lossy optical waveguides. This resolves a key issue, enabling better understanding of nonlinear optical systems.

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Area of Science:

* Nonlinear optics
* Plasmonics
* Materials science

Background:

* The nonlinear coefficient (γ) is crucial for studying cubically nonlinear optical guided-wave structures.
* Understanding γ in lossy systems is less developed than in lossless systems.
* Various methods exist for calculating γ in lossy systems, yielding different results.

Purpose of the Study:

* To identify the most accurate and practical expression for the nonlinear coefficient (γ) in lossy waveguides.
* To resolve the ambiguity in calculating γ for lossy systems.
* To provide new insights into the nonlinear response of lossy optical systems.

Main Methods:

* Applied different proposed expressions for γ to air-gold surface plasmon polariton modes.
* Focused on the interband region of gold.
* Compared results with a fully numerical iterative method.

Main Results:

* Identified the most accurate and practical expression for γ in lossy waveguides.
* Demonstrated the effectiveness of the chosen method through comparison with numerical simulations.
* Resolved the discrepancy between different calculation methods for γ.

Conclusions:

* The study provides a definitive method for calculating the nonlinear coefficient in lossy waveguides.
* This finding will advance the understanding and design of nonlinear optical devices.
* Enables new research into the nonlinear behavior of plasmonic and guided-wave systems.