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Journal of Nanophotonics

Photonic bandgap under irradiation of a Gaussian beam
Author(s): Kazem Jamshidi-Ghaleh; Reza Abdi-Ghaleh
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Paper Abstract

The transfer matrix of a dielectric slab under propagation of a Gaussian beam was formulated. The derived matrix was applied for a one-dimensional photonic crystal (1DPC) structure and the transmittance spectrum and photonic bandgap (PBG) properties were investigated. An r-dependent (r is the radial coordinate of the Gaussian beam) PBG was obtained. With the increase of r, a redshift and a decrease in the PBG are observed. Higher PBGs experience more shift. Also properties of the photonic crystal (PC) structure with defect layer were investigated and displacement to red and decrease of the defect mode peak height, with an increase of r, were observed. The extra optical path that the outer rays travel due to the oblique propagation compared to the central ray in a Gaussian beam is responsible for these effects. For long Rayleigh ranges our results for the Gaussian beam were the same as that for plane wave.

Paper Details

Date Published: 1 January 2011
PDF: 11 pages
J. Nanophoton. 5(1) 051817 doi: 10.1117/1.3609279
Published in: Journal of Nanophotonics Volume 5, Issue 1
Show Author Affiliations
Kazem Jamshidi-Ghaleh, Azarbaijan Univ. of Tarbiat Moallem (Iran, Islamic Republic of)
Reza Abdi-Ghaleh, Bonab Univ. of Technology (Iran, Islamic Republic of)

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