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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:27 |
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Conference: Bucharest University Faculty of Physics 2011 Meeting
Section: Solid State Physics and Materials Science
Title:
Pulse delay tuning by an anisotropic metamaterial slab
Authors:
A. Dumitriu, Daniela Dragoman
Affiliation:
University of Bucharest, Faculty of Physics, P.O.BOX MG-11, Magurele 077125, Magurele, Romania
E-mail
danieladragoman@yahoo.com
Keywords:
metamaterial, pulse delay, pulse shaping
Abstract:
In left-handed metamaterials both the electric permittivity and the magnetic permeability are negative in a certain frequency range. This property leads to new phenomena such as negative refraction angle and Goos-Hänchen effect, obtuse angle of the Cerenkov radiation, etc. The applications of metamaterials include perfect electromagnetic wave focusing by a planar metamaterial slab, which overcomes the diffraction limit of right-handed materials, electromagnetic cloaking, right-hand-to-left-hand material switching, and so on. In this contribution we show that dispersive and anisotropic left-handed metamaterials can be used to tune the pulse delay of a propagating narrow-band pulse. Pulse delay tuning as a function of the frequency of the incident radiation can be achieved in any dispersive material with a frequency-dependent transmission coefficient. However, when the material is highly anisotropic, which is always the case in left-handed metamaterials, the tuning of the pulse delay by a metamaterial slab can be achieved by simply tilting the slab and thus varying the angle of incidence. We study in detail the angular and frequency dependence of the pulse delay of an electromagnetic signal propagating in the frequency region in which both electric permittivity and magnetic permeability are negative. We find that pulse propagation is subluminal in all cases and is associated with a significant reshaping of the electromagnetic radiation, both phenomena being much more important than in right-handed materials. Such a large and easily tunable pulse delay has possible applications in integrated optical circuits.
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