All-angle self-collimation in two-dimensional square array photonic crystals based on index contrast tailoring

Mina Noori; Mohammad Soroosh; Hamed Baghban

doi:10.1117/1.OE.54.3.037111

27 March 2015 All-angle self-collimation in two-dimensional square array photonic crystals based on index contrast tailoring

Mina Noori, Mohammad Soroosh, Hamed Baghban

Author Affiliations +

Optical Engineering, Vol. 54, Issue 3, 037111 (March 2015). https://doi.org/10.1117/1.OE.54.3.037111

Abstract

A comprehensive study has been performed to achieve all-angle self-collimation in basic two-dimensional square array photonic crystals with cylindrical scatterers. Based on plane wave expansion and finite difference time domain analysis for both rod- and hole-type structures, we report on all-angle self-collimation (SC) in the first band of the structure, which results in loss suppression due to out-of-plane scatterings. A lower threshold for index contrast has been obtained to achieve all-angle SC, which offers more design flexibility regarding structural parameters. Furthermore, it has been shown that a minimum and maximum coupling efficiency enhancement of ∼40% and 80% can be achieved for the proposed structure, respectively, by introducing a row of scatterers with proper radius at the input and the output air/photonic crystal interfaces.

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Mina Noori, Mohammad Soroosh, and Hamed Baghban "All-angle self-collimation in two-dimensional square array photonic crystals based on index contrast tailoring," Optical Engineering 54(3), 037111 (27 March 2015). https://doi.org/10.1117/1.OE.54.3.037111

Published: 27 March 2015

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