Alù, Andrea

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Now showing 1 - 5 of 5
  • Publication
    Peculiar Radar Cross-Section Properties of Double-Negative and Single-Negative Metamaterials
    (2004-04-26) Alù, Andrea; Engheta, Nader
    Here, we give an overview of some of the results of our analysis of anomalous scattering phenomena for structures involving metamaterial layers, and we provide some physical insights and ideas for potential applications.
  • Publication
    Sub-wavelength Focusing and Negative Refraction along Positive-Index and Negative-Index Plasmonic Nano-Transmission Lines and Nano-Layers
    (2005-07-03) Alù, Andrea; Engheta, Nader
    Following our recent works on the concept of plasmonic nano-inductors and nano-capacitors and related complex circuits, here we analyze the possibility of designing nano-transmission-lines (NTL) made of these basic nano-elements. We show that in the limit in which these basic circuit elements are very close to each other, they can be regarded as planar stacks of plasmonic and nonplasmonic slabs, which may be designed to act as forward (right-handed) or backward (lefthanded) NTL. Negative refraction and left-handed propagation are shown to be possible in these planar plasmonic configurations, potentially applicable in several innovative setups for subwavelength focusing, imaging and waveguiding applications.
  • Publication
    Three-Dimensional Plasmonic Nanoswitch: Extreme Variation of Scattering Properties upon Rotation
    (2008-07-05) Alù, Andrea; Engheta, Nader
    The anomalous interaction of light with plasmonic materials has fascinated scientists and non-scientists for centuries. The recent interest in research on anomalous resonant phenomena involving plasmonic nanoparticles may be associated with the relevant advancements in nanotechnology of the last decade, which allow realization of artificial materials with a tailored anomalous electromagnetic response, with large design flexibility. We have recently proposed several novel applications that involve plasmonic nanoparticles, employed as nanoantennas, nanocircuit elements or nanowaveguides. In particular, in the framework of our recent paradigm for scaling the circuit concepts to optical frequencies [1], we have suggested that the combination of plasmonic and non-plasmonic nanoparticles may give rise to a novel type of circuitry at frequencies (IR and optical) at which metals lose their highly conductive properties. In this context, we have proposed the synthesis and design of nanotransmission-lines [2-3] and backward-wave nanomaterials [4], the optical equivalent of connecting "shorting" wires [5], combinations of parallel and series nanocircuit elements [6-7] and basic collections of nanofilters [8].
  • Publication
    Anomalous Mode Coupling in Guided-Wave Structures Containing Metamaterials with Negative Permittivity and Permeability
    (2002-08-26) Alù, Andrea; Engheta, Nader
    The peculiar characteristics of the mode coupling between standard dielectric waveguides and waveguides formed by a material with negative index of refraction are presented in this talk. Some of our theoretical results, describing the anti-directional (antiparallel) nature of such coupling, are shown for the case of the two-parallel-slab geometry.
  • Publication
    Mono-Modal Waveguides Filled with a Pair of Parallel Epsilon-Negative (ENG) and Mu-Negative (MNG) Metamaterial Layers
    (2003-06-08) Alù, Andrea; Engheta, Nader
    Here we analyze guided wave propagation in a parallel-plate waveguide filled with a pair of parallel lossless slabs; one possessing negative real permittivity but positive real permeability, and the other with negative real permeability and positive real permittivity, in the range of frequency of interest. It is shown that such a waveguide can support only a single propagating mode, essentially independent of the total thickness of this structure. Furthermore, this waveguide can still possess a propagating mode even when its thickness is very small. Field distribution and dispersion relations in such a mono-modal waveguide are obtained and discussed with physical insights and intuitive description for the mathematical findings.