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Study of beam propagation in finite photonic crystals

Khavasi, A ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1117/12.845466
  3. Publisher: 2010
  4. Abstract:
  5. Many authors simply use band structure of infinite photonic crystals to predict the beam's direction in a finite structure. The validity of this approximation for high frequencies has been questioned by Felbacq (PRL 92, 193902) and instead a dressed (by evanescent waves) transfer matrix has been suggested. In this work, we show through numerical examples that the direction obtained by conventional band structure is more accurate than that of dressed transfer matrix of Felbacq et. al. We also demonstrate that this approximation can be improved by taking the effect of evanescent Bloch modes into consideration. The effect of these modes leads to a constant shift of beam's center inside and far enough from the PC's interface
  6. Keywords:
  7. Grating ; Beam propagation ; Bloch modes ; Evanescent wave ; Finite size effect ; Finite structures ; High frequency ; Numerical example ; Show through ; Transfer matrixes ; Band structure ; Crystal structure ; Electrooptical devices ; Optoelectronic devices ; Transfer matrix method ; Photonic crystals
  8. Source: Proceedings of SPIE - The International Society for Optical Engineering, 25 January 2010 through 28 January 2010 ; Volume 7597 , January , 2010 ; 0277786X (ISSN) ; 9780819479938 (ISBN)
  9. URL: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=783520