Now showing items 1-6 of 6

    • Designing three-dimensional transformation optical media using quasiconformal coordinate transformations. 

      Kundtz, N; Landy, Nathan I; Smith, David R (Phys Rev Lett, 2010-11-05)
      We introduce an approach to the design of three-dimensional transformation optical (TO) media based on a generalized quasiconformal mapping approach. The generalized quasiconformal TO (QCTO) approach enables the design of ...
    • Enhancing imaging systems using transformation optics. 

      Kundtz, NB; Landy, Nathan I; Smith, David R; Urzhumov, Yaroslav A (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 ...
    • Going beyond Axisymmetry: 2.5D Vector Electromagnetics 

      Ciracì, Dr Cristian; Landy, Nathan I; Smith, David R; Urzhumov, Yaroslav A (2012-10)
      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 ...
    • Isotropic-medium three-dimensional cloaks for acoustic and electromagnetic waves 

      Landy, Nathan I; Smith, David R; Urzhumov, Yaroslav A (Journal of Applied Physics, 2012-03-01)
      We propose a generalization of the two-dimensional eikonal-limit cloak derived from a conformal transformation to three dimensions. The proposed cloak is a spherical shell composed of only isotropic media; it operates in ...
    • Relaxation approach for the generation of inhomogeneous distributions of uniformly sized particles 

      Hunt, J; Kundtz, N; Landy, Nathan I; Smith, David R (Applied Physics Letters, 2010-07-12)
      For many applications in gradient index devices and photonic crystals, it is necessary to be able to design semicrystalline distributions of particles where the lattice constant of the distribution is an arbitrary function ...
    • 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, ...