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Proceedings Paper

Adiabatic coupling to extended Bloch modes of photonic crystals
Author(s): Babak Momeni; Ali Adibi
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Paper Abstract

A robust scheme is proposed to adiabatically couple the light into and out of propagation modes of photonic crystal structures out of photonic bandgap. It is shown that group index plays the main role in reflection from layers with slight variations. This principle is used to design smoothly varying structures to adiabatically match the incident region to the transmission region. The smooth variation is obtained by modifying the size of holes and the aspect ratio of the unit cells in the buffer layers. It is shown that this method is insensitive to incident angle and wavelength and is therefore appropriate as general-purpose input and output buffer stages for dispersion-based applications of photonic crystal such as superprism-based demultiplexing, diffraction-free propagation, diffraction compensation, and dispersion compensation.

Paper Details

Date Published: 13 April 2005
PDF: 8 pages
Proc. SPIE 5733, Photonic Crystal Materials and Devices III, (13 April 2005); doi: 10.1117/12.601172
Show Author Affiliations
Babak Momeni, Georgia Institute of Technology (United States)
Ali Adibi, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 5733:
Photonic Crystal Materials and Devices III
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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