Browsing by Author "0517923"
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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. ... 
Active negativeindex metamaterial powered by an electron beam
Alù, A; Shapiro, MA; Shvets, G; Temkin, RJ; Trendafilov, S; Urzhumov, Yaroslav A (Physical Review B  Condensed Matter and Materials Physics, 20120821)An active negative index metamaterial that derives its gain from an electron beam is introduced. The metamaterial consists of a stack of equidistant parallel metal plates perforated by a periodic array of holes shaped as ... 
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 ... 
Complex k band diagrams of 3D metamaterial/photonic crystals.
Fietz, C; Shvets, G; Urzhumov, Yaroslav A (Opt Express, 20110926)A finite element method (FEM) for solving a complex valued k(ω) vs. ω dispersion curve of a 3D metamaterial/photonic crystal system is presented. This 3D method is a generalization of a previously reported 2D eigenvalue ... 
Construction of invisibility cloaks of arbitrary shape and size using planar layers of metamaterials
Elsen, C; Paul, O; Rahm, M; Smith, D; Urzhumov, Yaroslav A (Journal of Applied Physics, 20120615)Transformation optics (TO) is a powerful tool for the design of electromagnetic and optical devices with novel functionality derived from the unusual properties of the transformation media. In general, the fabrication of ... 
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 ... 
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 ... 
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 ... 
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 ... 
Magnetic levitation of metamaterial bodies enhanced with magnetostatic surface resonances
Bingham, C; Chen, W; Padilla, Willie John; Smith, David R; Urzhumov, Yaroslav A (Physical Review B  Condensed Matter and Materials Physics, 20120227)We propose that macroscopic objects built from negativepermeability metamaterials may experience resonantly enhanced magnetic force in lowfrequency magnetic fields. Resonant enhancement of the timeaveraged force originates ... 
Magnetic metamaterial superlens for increased range wireless power transfer.
Ensworth, J; Huang, D; Lee, JS; Lipworth, G; Nomura, T; Reynolds, MS; Schmalenberg, P; ... (10 authors) (Sci Rep, 20140110)The ability to wirelessly power electrical devices is becoming of greater urgency as a component of energy conservation and sustainability efforts. Due to health and safety concerns, most wireless power transfer (WPT) schemes ... 
Magnetic superlensenhanced inductive coupling for wireless power transfer
Hoo Teo, K; Huang, D; Smith, David R; Urzhumov, Yaroslav A; Zhang, J (Journal of Applied Physics, 20120315)We investigate numerically the use of a negativepermeability perfect lens for enhancing wireless power transfer between two current carrying coils. The negative permeability slab serves to focus the flux generated in the ... 
Metamaterialenhanced coupling between magnetic dipoles for efficient wireless power transfer
Smith, David R; Urzhumov, Yaroslav A (Physical Review B  Condensed Matter and Materials Physics, 20110518)Nonradiative coupling between conductive coils is a candidate mechanism for wireless energy transfer applications. In this paper we propose a power relay system based on a nearfield metamaterial superlens and present a ...