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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
05:57

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Published on: April 1, 2020

Shifted angular spectrum method for off-axis numerical propagation.

Kyoji Matsushima1

  • 1Department of Electrical and Electronic Engineering, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan. matsu@kansai-u.ac.jp

Optics Express
|August 20, 2010
PubMed
Summary
This summary is machine-generated.

A new method improves free-space optical field propagation simulation by using the angular spectrum method to prevent aliasing errors common in the shifted-Fresnel method, especially for short distances.

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Area of Science:

  • Optics and Photonics
  • Computational Electromagnetics

Background:

  • Simulating free-space propagation is crucial for optical systems.
  • The shifted-Fresnel method (Shift-FR) enables off-axis, non-paraxial, and large-scale field calculations.
  • Shift-FR suffers from aliasing errors at short propagation distances.

Purpose of the Study:

  • To develop a novel numerical method for simulating off-axis free-space propagation.
  • To address and resolve the aliasing error problem in the shifted-Fresnel method.
  • To enable accurate simulation of non-paraxial and large-scale optical fields.

Main Methods:

  • The proposed method is based on the angular spectrum method.
  • It overcomes the aliasing error limitations of the shifted-Fresnel method.
  • Formulation and numerical examples are provided to validate the approach.

Main Results:

  • The novel method effectively simulates free-space propagation to laterally shifted sampling windows.
  • It successfully resolves the strong aliasing errors encountered with the shifted-Fresnel method at short distances.
  • Numerical examples confirm the accuracy and efficacy of the proposed technique.

Conclusions:

  • The proposed angular spectrum-based method offers a robust solution for off-axis optical field propagation.
  • This technique enhances the accuracy of simulating non-paraxial and large-scale fields.
  • It provides a valuable tool for computational optics and electromagnetics research.