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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

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Published on: November 30, 2012

Modal formulation for diffraction by absorbing photonic crystal slabs.

Kokou B Dossou1, Lindsay C Botten, Ara A Asatryan

  • 1CUDOS, University of Technology, Sydney, NSW 2007, Australia. Kokou.Dossou@uts.edu.au

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|May 8, 2012
PubMed
Summary

A new finite element method accurately models light absorption in photonic crystals for solar cells. This approach optimizes photovoltaic device geometry for enhanced light absorption.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Computational Physics

Background:

  • Photonic crystals offer tunable optical properties for advanced applications.
  • Efficient light absorption is crucial for enhancing photovoltaic device performance.
  • Complex geometries in photonic crystals pose challenges for accurate optical modeling.

Purpose of the Study:

  • To develop a finite element-based modal formulation for analyzing plane wave diffraction by absorbing photonic crystal slabs.
  • To enable efficient and accurate calculation of light absorption in complex photonic crystal structures for photovoltaic applications.
  • To provide physical insight into absorption mechanisms for optimizing photonic crystal designs.

Main Methods:

  • Developed a semianalytic finite element modal formulation.
  • Applied the method to model diffraction and absorption in arbitrary photonic crystal slab geometries.
  • Validated the approach using a silicon nanowire array model.

Main Results:

  • The method efficiently and accurately calculates absorption in complex unit cell arrays.
  • Demonstrated the ability to gain physical insight into light absorption mechanisms.
  • Verified and validated the formulation's accuracy and efficiency on a silicon nanowire array.

Conclusions:

  • The developed finite element method is suitable for analyzing photonic crystal slabs in photovoltaic applications.
  • The approach facilitates the study of spectral properties, such as absorption, as a function of array thickness.
  • Efficient calculations can identify optimal geometries for enhanced light absorption in photonic crystal solar cells.