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Nanomaterials 2015, 5(1), 376-385; doi:10.3390/nano5010376

Unidirectional Wave Propagation in Low-Symmetric Colloidal Photonic-Crystal Heterostructures

Department of Physics, National Technical University of Athens, GR-15780 Athens, Greece
Academic Editor: Lorenzo Rosa
Received: 16 January 2015 / Revised: 13 March 2015 / Accepted: 17 March 2015 / Published: 19 March 2015
(This article belongs to the Special Issue Nanophotonic Materials)
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Abstract

We show theoretically that photonic crystals consisting of colloidal spheres exhibit unidirectional wave propagation and one-way frequency band gaps without breaking time-reversal symmetry via, e.g., the application of an external magnetic field or the use of nonlinear materials. Namely, photonic crystals with low symmetry such as the monoclinic crystal type considered here as well as with unit cells formed by the heterostructure of different photonic crystals show significant unidirectional electromagnetic response. In particular, we show that the use of scatterers with low refractive-index contrast favors the formation of unidirectional frequency gaps which is the optimal route for achieving unidirectional wave propagation. View Full-Text
Keywords: photonic crystals; wave transmission; multiple-scattering photonic crystals; wave transmission; multiple-scattering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yannopapas, V. Unidirectional Wave Propagation in Low-Symmetric Colloidal Photonic-Crystal Heterostructures. Nanomaterials 2015, 5, 376-385.

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