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      Variable group delay in a metamaterial with field-gradient-induced transparency

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          Abstract

          We realize variable control of the group delay in an electromagnetically induced transparency-like metamaterial. Its unit cell is designed to have a bright mode and a dark mode. The coupling strength between these two modes is determined by the electromagnetic field gradient. In this metamaterial with field-gradient-induced transparency, the group delay at the transparency frequency can be varied by varying the incident angle of the electromagnetic plane waves. By tilting a single layer of the metamaterial, the group delay of a microwave pulse can be varied between 0.50 and 1.85 ns.

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          Plasmon-Induced Transparency in Metamaterials

          A plasmonic "molecule" consisting of a radiative element coupled with a subradiant (dark) element is theoretically investigated. The plasmonic molecule shows electromagnetic response that closely resembles the electromagnetically induced transparency in an atomic system. Because of its subwavelength dimension, this electromagnetically induced transparency-like molecule can be used as a building block to construct a "slow light" plasmonic metamaterial.
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            A metamaterial analog of electromagnetically induced transparency

            We present a new type of electromagnetic planar metamaterial that exhibit strong dispersion at a local minimum of losses and is believed to be the first metamaterial analog of electromagnetically induced transparency. We demonstrate that pulses propagating through such metamaterials experience considerable delay, whereas the thickness of the structure along the direction of wave propagation is much smaller than the wavelength, which allows successive stacking of multiple metamaterial slabs. This leads to a significant increase in the band of normal dispersion, as well as in transmission levels.
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              Low Loss Metamaterials Based on Classical Electromagnetically Induced Transparency

              , , (2010)
              We demonstrate theoretically that electromagnetically induced transparency can be achieved in metamaterials, in which electromagnetic radiation is interacting resonantly with mesoscopic oscillators rather than with atoms. We describe novel metamaterial designs that can support full dark resonant state upon interaction with an electromagnetic beam and we present results of its frequency-dependent effective permeability and permittivity. These results, showing a transparency window with extremely low absorption and strong dispersion, are confirmed by accurate simulations of the electromagnetic field propagation in the metamaterial.
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                Author and article information

                Journal
                14 September 2011
                2012-02-07
                Article
                10.1103/PhysRevB.85.073102
                1109.3048
                af606bca-29dc-4b63-8b19-38a7cbedf907

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
                Custom metadata
                Physical Review B, vol. 85, p. 073102 (2012)
                5 pages, 6 figures
                physics.optics

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