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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Forward wide-angle light propagation in semiconductor rib waveguides.

D Yevick, M Glasner

|September 18, 2009

Summary

Researchers developed a new wide-angle equation for light propagation, offering a rapid solution method. This approach accurately predicts optical losses in semiconductor rib-waveguide Y junctions.

Area of Science:

Optics and Photonics
Computational Electromagnetics
Semiconductor Device Physics

Background:

Accurate modeling of light propagation in optical waveguides is crucial for device design.
Existing methods may have limitations in handling wide-angle propagation or computational efficiency.
Nonparaxial effects become significant in strongly guiding structures.

Purpose of the Study:

To derive and validate a novel nonparaxial wide-angle equation for unidirectional light propagation.
To develop an efficient and accurate numerical solution technique for the derived equation.
To assess the performance of the new method using a realistic semiconductor rib-waveguide Y junction test case.

Main Methods:

Derivation of a new nonparaxial wide-angle equation.

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Development of a unitary solution procedure combining split-step fast-Fourier-transform and finite-difference methods.

Numerical simulation of light propagation in a semiconductor rib-waveguide Y junction.

Main Results:

Successful derivation of the nonparaxial wide-angle equation.
Implementation of a rapid unitary solution algorithm.
Calculated optical losses show good agreement with established Fresnel equation methods for the test case.

Conclusions:

The new nonparaxial wide-angle equation provides an accurate description of light propagation.
The developed solution procedure is efficient and suitable for practical applications.
The method shows promise for analyzing complex waveguide structures like Y junctions.