Now showing items 21-27 of 27

    • Nanophotonics: Optical time reversal with graphene 

      Ciracì, Dr Cristian; Smith, David R; Urzhumov, Yaroslav A (2013-07)
      Would you ever guess that a microscopic flake of graphite could reverse the diffraction of light? An experiment that demonstrates just such an effect highlights the exciting optical applications of graphene — an atomic layer ...
    • Nonlinear oscillator metamaterial model: numerical and experimental verification. 

      Huang, D; Poutrina, E; Smith, David R; Urzhumov, Yaroslav A (Opt Express, 2011-04-25)
      We verify numerically and experimentally the accuracy of an analytical model used to derive the effective nonlinear susceptibilities of a varactor-loaded split ring resonator (VLSRR) magnetic medium. For the numerical validation, ...
    • Probing the ultimate limits of plasmonic enhancement. 

      Chilkoti, A; Ciracì, Dr Cristian; Fernández-Domínguez, AI; Hill, RT; Maier, SA; Mock, JJ; Pendry, JB; ... (9 authors) (Science, 2012-08-31)
      Metals support surface plasmons at optical wavelengths and have the ability to localize light to subwavelength regions. The field enhancements that occur in these regions set the ultimate limitations on a wide range of nonlinear ...
    • Structurally Rigid Elastic Composites for Acoustic Imaging Countermeasures 

      Smith, David R; Starr, Anthony F; Urzhumov, Yaroslav A (2013-06-07)
      We explore the possibilities coming from transformation acoustics and beyond for creating rigid elastic composite shells capable of suppressing the total scattering cross-section of acoustically large objects. The reported ...
    • Thin low-loss dielectric coatings for free-space cloaking 

      Basov, Dimitri; Driscoll, Tom; Landy, Nathan I; Smith, David R; Urzhumov, Yaroslav A (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, ...
    • Towards macroscopic optical invisibility devices: geometrical optics of complex materials 

      Smith, David R; Urzhumov, Yaroslav A (2012-01-18)
      Recently, a path towards macroscopic, transparent optical cloaking devices that may conceal objects spanning millions of wavelengths has been proposed [1]. Such devices are designed using transformation optics (TO) [2,3]. ...
    • Transformation optics with photonic band gap media. 

      Smith, David R; Urzhumov, Yaroslav A (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 ...