Nader Engheta

Abstract: The manipulation of individual micrometer sized objects has been the focus of significant research efforts over the last few years. A previously proposed method for the arbitrary manipulation of nanoparticles is experimentally demonstrated. This method employs dielectrophoretic forces for the planar control of the motion and orientation of such nanoparticles between a set of microfabricated electrodes. Each electrode is approximated as a set of sources, namely, an unknown point charge and induced dipole. Imposing constraints on the electric field at the location of the particle and requiring self-consistency uniquely determine the sources. They can then be subsequently used to determine the set of electrode voltages that creates an electric field that will produce the prescribed orientation and force on the particle. The drag coefficients of a nanorod are experimentally determined by sequentially applying a constant force both parallel and perpendicular to its axis and observing a resulting motion. With the drag coefficients in hand, the velocity rather than force can be prescribed, and the rod is directed to move accurately at oblique angles to its orientation. The rod is in a constant state of unstable equilibrium and requires negative feedback to maintain a fixed position. The automation of such feedback is demonstrated, allowing a controlled travel of the nanostructures over complex paths.

TL;DR: In this paper, the effect of a small disorder on the guidance properties of plasmonic nanoparticles is quantitatively taken into account, and the main effect of the small disorder consists of additional radiation losses for the guided mode.

TL;DR: The author presents a brief background and the history of complex media, in particular the materials with negative permittivity and permeability, and then he discusses some of the salient electromagnetic features of these metamaterials.

TL;DR: In this article, the wave parameters in DNG media FDTD simulations of DNG Media Causality in DNN Media Scattering from a DNG Slab Backward Waves Negative Refraction Phase Compensation with DNG Medium Dispersion Compensation in a Transmission Line Using aDNG Medium Subwavelength Focusing with a DNN Medium Metamaterials with a Zero Index of Refraction Summary References

TL;DR: In this paper, the authors analyze theoretically another problem associated with chirowaveguides, namely, the problem of reflection and transmission of guided waves at an air-chiral interface and at a chiral slab located transversely in a parallel-plate waveguide.