Browsing by Author "0332562"
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Acoustic cloaking transformations from attainable material properties
Ghezzo, F; Hunt, J; Smith, David R; Urzhumov, Yaroslav A (New Journal of Physics, 20100712)We propose a general methodology and a set of practical recipes for the construction of ultrabroadband acoustic cloaksstructures that can render themselves and a concealed object undetectable by means of acoustic scattering. ... 
Analysis of the power dependent tuning of a varactorloaded metamaterial at microwave frequencies
Huang, D; Poutrina, E; Smith, David R (Applied Physics Letters, 20100326)We present an analysis of the nonlinear, powerdependent resonance frequency shift for two metamaterial mediums consisting of arrays of varactorloaded split ring resonators (VLSRRs). We confirm that, over a limited range ... 
Analytic expressions for the constitutive parameters of magnetoelectric metamaterials
Smith, David R (Physical Review E  Statistical, Nonlinear, and Soft Matter Physics, 20100317)Electromagnetic metamaterials are artificially structured media typically composed of arrays of resonant electromagnetic circuits, the dimension and spacing of which are considerably smaller than the freespace wavelengths ... 
Broadband electromagnetic cloaking with smart metamaterials.
Baek, S; Choi, M; Jung, Y; Kang, G; Kim, K; Park, H; Shin, D; ... (9 authors) (Nat Commun, 2012)The ability to render objects invisible with a cloak that fits all objects and sizes is a longstanding goal for optical devices. Invisibility devices demonstrated so far typically comprise a rigid structure wrapped around ... 
Characterization of high order modes of plasmonic antenna formed by nanoparticle/thin film hybrid structures
Chen, SY; Lazarides, Alexander; Smith, David R; Urzhumov, Yaroslav A (Proceedings of SPIE  The International Society for Optical Engineering, 20120504)The plasmonic modes of a nanoantenna formed by a nanoparticle/thin film hybrid system are investigated. Plasmonic nanoantennas are wellknown for their capabilities to concentrate electromagnetic wave into extreme small ... 
Control of radiative processes using tunable plasmonic nanopatch antennas.
Ciracì, Dr Cristian; Hoang, TB; McGuire, F; Mikkelsen, MH; Mock, JJ; Rose, A; Smith, David R (Nano Lett, 20140813)The radiative processes associated with fluorophores and other radiating systems can be profoundly modified by their interaction with nanoplasmonic structures. Extreme electromagnetic environments can be created in plasmonic ... 
Controlling the second harmonic in a phasematched negativeindex metamaterial.
Huang, D; Rose, A; Smith, David R (Phys Rev Lett, 20110805)Nonlinear metamaterials have been predicted to support new and exciting domains in the manipulation of light, including novel phasematching schemes for wave mixing. Most notable is the socalled nonlinearoptical mirror, ... 
Crosssection comparisons of cloaks designed by transformation optical and optical conformal mapping approaches
Kundtz, NB; Pendry, JB; Smith, David R; Urzhumov, Yaroslav A (Journal of Optics, 20110201)We review several approaches to optical invisibility designed using transformation optics (TO) and optical conformal mapping (CM) techniques. TO is a general framework for solving inverse scattering problems based on mimicking ... 
Designing threedimensional transformation optical media using quasiconformal coordinate transformations.
Kundtz, N; Landy, Nathan I; Smith, David R (Phys Rev Lett, 20101105)We introduce an approach to the design of threedimensional transformation optical (TO) media based on a generalized quasiconformal mapping approach. The generalized quasiconformal TO (QCTO) approach enables the design of ... 
Electronically reconfigurable metalonsilicon metamaterial
Dhar, Sulochana; Jokerst, NM; Lee, JS; Nguyen, V; Schmalenberg, P; Smith, David R; Tyler, T; ... (8 authors) (Physical Review B  Condensed Matter and Materials Physics, 20120808)Reconfigurable metamaterialbased apertures can play a unique role in both imaging and in beamforming applications, where current technology relies mostly on the fabrication and integration of large detector or antenna ... 
Enhancing imaging systems using transformation optics.
Kundtz, NB; Landy, Nathan I; Smith, David R; Urzhumov, Yaroslav A (Opt Express, 20100927)We apply the transformation optical technique to modify or improve conventional refractive and gradient index optical imaging devices. In particular, when it is known that a detector will terminate the paths of rays over ... 
Experimental determination of the quadratic nonlinear magnetic susceptibility of a varactorloaded split ring resonator metamaterial
Huang, D; Larouche, S; Poutrina, E; Rose, A; Smith, David R (Applied Physics Letters, 20100705)This letter presents a quantitative measurement of the second harmonic generated by a slab of varactor loaded split ring resonator metamaterial and the retrieval of the effective quadratic nonlinear magnetic susceptibility ... 
Farfield analysis of axially symmetric threedimensional directional cloaks.
Ciracì, Dr Cristian; Smith, David R; Urzhumov, Yaroslav A (Opt Express, 20130422)Axisymmetric radiating and scattering structures whose rotational invariance is broken by nonaxisymmetric excitations present an important class of problems in electromagnetics. For such problems, a cylindrical ... 
Flow stabilization with active hydrodynamic cloaks
Smith, David R; Urzhumov, Yaroslav A (Physical Review E  Statistical, Nonlinear, and Soft Matter Physics, 20121121)We demonstrate that fluid flow cloaking solutions, based on active hydrodynamic metamaterials, exist for twodimensional flows past a cylinder in a wide range of Reynolds numbers (Re's), up to approximately 200. Within the ... 
Fluid flow control with transformation media.
Smith, David R; Urzhumov, Yaroslav A (Phys Rev Lett, 20110812)We introduce a new concept for the manipulation of fluid flow around threedimensional bodies. Inspired by transformation optics, the concept is based on a mathematical idea of coordinate transformations and physically ... 
Going beyond Axisymmetry: 2.5D Vector Electromagnetics
Ciracì, Dr Cristian; Landy, Nathan I; Smith, David R; Urzhumov, Yaroslav A (201210)Linear wave propagation through inhomogeneous structures of size R≫λ (Fig.1) is a computationally challenging problem, in particular when using finite element methods, due to the steep increase of the number of degrees of ... 
Gold nanoparticles on polarizable surfaces as Raman scattering antennas.
Chen, SY; Chilkoti, A; Hill, RT; Lazarides, Alexander; Mock, JJ; Smith, David R (ACS Nano, 20101123)Surface plasmons supported by metal nanoparticles are perturbed by coupling to a surface that is polarizable. Coupling results in enhancement of near fields and may increase the scattering efficiency of radiative modes. ... 
Isotropicmedium threedimensional cloaks for acoustic and electromagnetic waves
Landy, Nathan I; Smith, David R; Urzhumov, Yaroslav A (Journal of Applied Physics, 20120301)We propose a generalization of the twodimensional eikonallimit cloak derived from a conformal transformation to three dimensions. The proposed cloak is a spherical shell composed of only isotropic media; it operates in ... 
Leveraging nanoscale plasmonic modes to achieve reproducible enhancement of light.
Chen, SY; Chilkoti, A; Hill, RT; Lazarides, Alexander; Mock, JJ; Oldenburg, SJ; Sebba, DS; ... (9 authors) (Nano Lett, 20101013)The strongly enhanced and localized optical fields that occur within the gaps between metallic nanostructures can be leveraged for a wide range of functionality in nanophotonic and optical metamaterial applications. Here, ... 
Lowloss directional cloaks without superluminal velocity or magnetic response.
Smith, David R; Urzhumov, Yaroslav A (Opt Lett, 20121101)The possibility of making an optically large (many wavelengths in diameter) object appear invisible has been a subject of many recent studies. Exact invisibility scenarios for large (relative to the wavelength) objects involve ...