Planar negative refractive index media using periodically L-C loaded transmission lines

Broadband, Volumetric Negative-Refractive-Index Media

Broadband, Volumetric Negative-Refractive-Index Media by Scott M. Rudolph Chair: Anthony Grbic Since their invention, negative-refractive-index (NRI) media have been plagued by three primary limitations: narrow bandwidth, high loss and polarization dependence. In this thesis, each of these problems is addressed. First, a new metamaterial topology that achieves negative permeability over a broad...

Nonlinear Waves in Transmission Lines Periodically Loaded with Tunneling Diodes

Resolving the wave vector in negative refractive index media.

We address the general issue of resolving the wave vector in complex electromagnetic media including negative refractive media. This requires us to make a physical choice of the sign of a square root imposed merely by conditions of causality. By considering the analytic behavior of the wave vector in the complex plane, it is shown that there are a total of eight physically distinct cases in the...

Refraction in media with a negative refractive index.

We show that an electromagnetic (EM) wave undergoes negative refraction at the interface between a positive and negative refractive index material, the latter being a properly chosen photonic crystal. Finite-difference time-domain (FDTD) simulations are used to study the time evolution of an EM wave as it hits the interface. The wave is trapped temporarily at the interface, reorganizes, and, af...

Nonmagnetic nanocomposites for optical and infrared negative-refractive-index media

We develop an approach to use nanostructured plasmonic materials as a nonmagnetic negative-refractiveindex system at optical and near-infrared frequencies. In contrast to conventional negative-refraction materials, our design does not require periodicity and thus is highly tolerant to fabrication defects. Moreover, since the proposed materials are intrinsically nonmagnetic, their performance is...