Near-Zero-Refractive-Index Structure at Optical FrequenciesReport as inadecuate

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Advances in Condensed Matter PhysicsVolume 2013 2013, Article ID 328402, 8 pages

Research Article

Department of Physics, Al-Azhar University, Gaza, Palestine

Department of Physics, University of Dayton, Dayton, OH 45469, USA

Received 31 May 2013; Accepted 8 September 2013

Academic Editor: Rosa Lukaszew

Copyright © 2013 Hassan S. Ashour. 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.


We have used a new class of left-handed materials, which uses 3D nanospheres distributed in loops in the dielectric host material. These 3D nanospheres loops give rise to negative effective permeability and permeability at Terahertz optical frequencies. The modal dispersion relation for Terahertz TE surface waves has been derived for a slab waveguide constructed from a dielectric material slab sandwiched between two thick layers of Terahertz left-handed material LHM. The modal dispersion relation and the power flow were numerically solved for a given set of parameters: dielectric slab thickness, the operating frequency, mode order, and the power flow and extinction in the structure. The real part of the effective refractive index exhibits near-zero values, with small extinction coefficient values. Besides that, the power flow in the dielectric core increased with slab thickness increase and the power attenuation decreased with thickness increase.

Author: Hassan S. Ashour



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