Browsing by Author "Kundtz, N"

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Open Access
Designing three-dimensional transformation optical media using quasiconformal coordinate transformations.
(Phys Rev Lett, 2010-11-05) Landy, NI; Kundtz, N; Smith, DR
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 media that can, in principle, be broadband and low loss, while controlling the propagation of waves with arbitrary angles of incidence and polarization. We illustrate the method in the design of a three-dimensional carpet ground plane cloak and of a flattened Luneburg lens. Ray-trace studies provide a confirmation of the performance of the QCTO media, while also revealing the limited performance of index-only versions of these devices.
Open Access
Relaxation approach for the generation of inhomogeneous distributions of uniformly sized particles
(Applied Physics Letters, 2010-07-12) Hunt, J; Kundtz, N; Landy, N; Smith, DR
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 of position. We propose a method to generate such distributions which is physically motivated by a system of interacting particles, and apply it to the design and implementation of a microwave gradient index lens. While the demonstration was preformed at microwave wavelengths, this technique would also be particularly useful for designing devices for operation at IR and visible wavelengths where the fabrication of distributions of uniformly sized holes or columns is very easy. © 2010 American Institute of Physics.