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- Richard W. Ziolkowski, Ehud Heyman
- Physical review. E, Statistical, nonlinear, and…
- 2001

Wave propagation in a double negative (DNG) medium, i.e., a medium having negative permittivity and negative permeability, is studied both analytically and numerically. The choices of the square root that leads to the index of refraction and the wave impedance in a DNG medium are determined by imposing analyticity in the complex frequency domain, and the… (More)

The effect of surrounding an electrically small dipole antenna with a shell of double negative (DNG) material ( 0 and 0) has been investigated both analytically and numerically. The problem of an infinitesimal electric dipole embedded in a homogeneous DNG medium is treated; its analytical solution shows that this electrically small antenna acts inductively… (More)

- Richard W. Ziolkowski
- Physical review. E, Statistical, nonlinear, and…
- 2004

Planar metamaterials that exhibit a zero index of refraction have been realized experimentally by several research groups. Their existence stimulated the present investigation, which details the properties of a passive, dispersive metamaterial that is matched to free space and has an index of refraction equal to zero. Thus, unlike previous zero-index… (More)

- Richard W. Ziolkowski
- Optics express
- 2003

The interactions of pulsed and continuous wave (CW) Gaussian beams with double negative (DNG) metatmaterials are considered. Subwavelength focusing of a diverging, normally incident pulsed Gaussian beam with a planar DNG slab is demonstrated. The negative angle of refraction behavior associated with the negative index of refraction exhibited by DNG… (More)

A planar Microwave Band Gap (MBG) cavity resonator filter that is completely compatible with current commercial printed circuit board (PCB) fabrication techniques has been designed, fabricated and tested. This filter provides a 1.33% bandwidth passband response at 10.67 GHz with a corresponding insertion loss of 2.17 dB. Design considerations and equations… (More)

- Joshua A. Gordon, Richard W. Ziolkowski
- Optics express
- 2007

The optical properties of a concentric nanometer-sized spherical shell comprised of an (active) 3-level gain medium core and a surrounding plasmonic metal shell are investigated. Current research in optical metamaterials has demonstrated that including lossless plasmonic materials to achieve a negative permittivity in a nano-sized coated spherical particle… (More)

- Edwin A. Marengo, Anthony J. Devaney, Richard W. Ziolkowski
- Journal of the Optical Society of America. A…
- 2000

We present a new linear inversion formalism for the scalar inverse source problem in three-dimensional and one-dimensional (1D) spaces, from which a number of previously unknown results on minimum-energy (ME) sources and their fields readily follow. ME sources, of specified support, are shown to obey a homogeneous Helmholtz equation in the interior of that… (More)

- Amy E. Galbraith, James Theiler, Kurtis J. Thome, Richard W. Ziolkowski
- IEEE Trans. Geoscience and Remote Sensing
- 2005

This paper studies the feasibility of enhancing the spatial resolution of multi-look Multispectral Thermal Imager (MTI) imagery using an iterative resolution enhancement algorithm known as Projection Onto Convex Sets (POCS). A multiangle satellite image modeling tool is implemented, and simulated multi-look MTI imagery is formed to test the resolution… (More)

A metamaterial paradigm for achieving an efficient, electrically small antenna is introduced. Spherical shells of homogenous, isotropic negative permittivity (ENG) material are designed to create electrically small resonant systems for several antennas: an infinitesimal electric dipole, a very short center-fed cylindrical electric dipole, and a very short… (More)

- Richard W. Ziolkowski, Peng Jin, Chia-Ching Lin
- Proceedings of the IEEE
- 2011