Browsing by Author "Smith, David R"

Now showing items 1-14 of 14

    • Broadband electromagnetic cloaking with smart metamaterials. 

      Shin, Dongheok; Urzhumov, Yaroslav; Jung, Youngjean; Kang, Gumin; Baek, Seunghwa; Choi, Minjung; Park, Haesung; ... (9 authors) (Nat Commun, 2012)
      The ability to render objects invisible with a cloak that fits all objects and sizes is a long-standing goal for optical devices. Invisibility devices demonstrated so far typically comprise a rigid structure wrapped around ...

    • Control of radiative processes using tunable plasmonic nanopatch antennas. 

      Rose, Alec; Hoang, Thang B; McGuire, Felicia; Mock, Jack J; Ciracì, Cristian; Smith, David R; Mikkelsen, Maiken H (Nano Lett, 2014-08-13)
      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 phase-matched negative-index metamaterial. 

      Rose, Alec; Huang, Da; Smith, David R (Phys Rev Lett, 2011-08-05)
      Nonlinear metamaterials have been predicted to support new and exciting domains in the manipulation of light, including novel phase-matching schemes for wave mixing. Most notable is the so-called nonlinear-optical mirror, ...

    • Enhancing imaging systems using transformation optics. 

      Smith, David R; Urzhumov, Yaroslav; Kundtz, Nathan B; Landy, Nathan I (Opt Express, 2010-09-27)
      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 ...

    • Far-field analysis of axially symmetric three-dimensional directional cloaks. 

      Ciracì, Cristian; Urzhumov, Yaroslav; Smith, David R (Opt Express, 2013-04-22)
      Axisymmetric radiating and scattering structures whose rotational invariance is broken by non-axisymmetric excitations present an important class of problems in electromagnetics. For such problems, a cylindrical ...

    • Flow stabilization with active hydrodynamic cloaks 

      Urzhumov, Yaroslav A; Smith, David R (Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2012-11-21)
      We demonstrate that fluid flow cloaking solutions, based on active hydrodynamic metamaterials, exist for two-dimensional 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. 

      Urzhumov, Yaroslav A; Smith, David R (Phys Rev Lett, 2011-08-12)
      We introduce a new concept for the manipulation of fluid flow around three-dimensional bodies. Inspired by transformation optics, the concept is based on a mathematical idea of coordinate transformations and physically ...

    • Gold nanoparticles on polarizable surfaces as Raman scattering antennas. 

      Chen, Shiuan-Yeh; Mock, Jack J; Hill, Ryan T; Chilkoti, Ashutosh; Smith, David R; Lazarides, Anne A (ACS Nano, 2010-11-23)
      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. ...

    • Leveraging nanoscale plasmonic modes to achieve reproducible enhancement of light. 

      Hill, Ryan T; Mock, Jack J; Urzhumov, Yaroslav; Sebba, David S; Oldenburg, Steven J; Chen, Shiuan-Yeh; Lazarides, Anne A; ... (9 authors) (Nano Lett, 2010-10-13)
      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, ...

    • Low-loss directional cloaks without superluminal velocity or magnetic response. 

      Urzhumov, Yaroslav; Smith, David R (Opt Lett, 2012-11-01)
      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 metamaterial superlens for increased range wireless power transfer. 

      Lipworth, Guy; Ensworth, Joshua; Seetharam, Kushal; Huang, Da; Lee, Jae Seung; Schmalenberg, Paul; Nomura, Tsuyoshi; ... (10 authors) (Sci Rep, 2014-01-10)
      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 ...

    • Nonlinear parameter retrieval from three- and four-wave mixing in metamaterials 

      Rose, Alec; Larouche, Stéphane; Huang, Da; Poutrina, Ekaterina; Smith, David R (Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2010-09-28)
      We present a generalized nonlinear susceptibility retrieval method for metamaterials based on transfer matrices and valid in the nondepleted pump approximation. We construct a general formalism to describe the transfer matrix ...

    • Thin low-loss dielectric coatings for free-space cloaking 

      Urzhumov, Yaroslav; Landy, Nathan; Driscoll, Tom; Basov, Dimitri; Smith, David R (2013-05-03)
      We report stereolithographic polymer-based fabrication and experimental operation of a microwave X-band cloaking device. The device is a relatively thin (about one wavelength thick) shell of an air dielectric composite, ...

    • Transformation optics with photonic band gap media. 

      Urzhumov, Yaroslav A; Smith, David R (Phys Rev Lett, 2010-10-15)
      We introduce a class of optical media based on adiabatically modulated, dielectric-only, and potentially extremely low-loss, photonic crystals (PC). The media we describe represent a generalization of the eikonal limit of ...