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Electromagnetic ray tracing model for line structures.

C B Tan1, A Khoh, S H Yeo

  • 1Nanyang Technological University, School of Mechanical and Aerospace Engineering, Singapore 639798.

Optics Express
|June 11, 2008
PubMed
Summary
This summary is machine-generated.

A new electromagnetic ray tracing (ERT) model accurately predicts scattering from line structures. This high-frequency approach identifies physical fields, offering promising results for narrow structures compared to finite difference time domain methods.

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Area of Science:

  • Electromagnetics and Wave Propagation
  • Computational Physics
  • Materials Science

Background:

  • Electromagnetic scattering from micro/nanostructures is crucial in various applications.
  • Accurate modeling of scattering from line structures, especially narrow ones, remains challenging.
  • High-frequency approximation methods offer efficient alternatives to full-wave solutions.

Purpose of the Study:

  • To establish a novel electromagnetic ray tracing (ERT) model for analyzing scattering from line structures.
  • To identify and formulate individual physical field contributions to the scattering phenomenon.
  • To validate the ERT model's accuracy against established numerical methods.

Main Methods:

  • Development of an electromagnetic ray tracing (ERT) model based on high-frequency approximation.
  • Formulation of geometrical optics fields and diffracted fields associated with line structures.
  • Step-by-step summation of electromagnetic fields to analyze amplitude profile disturbances.
  • Comparison of ERT model results with finite difference time domain (FDTD) solutions.

Main Results:

  • The ERT model successfully identifies distinct physical field contributions to electromagnetic scattering.
  • Formulations for geometrical optics and diffracted fields are presented.
  • The model demonstrates promising accuracy when compared to FDTD for a 0.4 wavelength wide polysilicon line structure.

Conclusions:

  • The established ERT model provides an effective high-frequency approach for analyzing electromagnetic scattering from line structures.
  • The model's ability to resolve individual field contributions enhances understanding of scattering mechanisms.
  • The ERT model shows significant potential for simulating scattering from narrow line structures in electromagnetic applications.