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Full-Text Articles in Physics

Matter-Wave Self-Imaging By Atomic Center-Of-Mass Motion Induced Interference, Ke Li, L. Deng, E. W. Hagley, Marvin G. Payne, M. S. Zhan Dec 2008

Matter-Wave Self-Imaging By Atomic Center-Of-Mass Motion Induced Interference, Ke Li, L. Deng, E. W. Hagley, Marvin G. Payne, M. S. Zhan

Marvin G. Payne

We demonstrate matter-wave self-imaging resulting from atomic center-of-mass motion-based interference. We show that non-negligible atomic center-of-mass motion and an instantaneous Doppler shift can drastically change the condensate momentum distribution, resulting in a periodic collapse and the recurrence of condensate diffraction probability as a function of the stationary light-field pulsing time. The observed matter-wave self-imaging is characterized by an atomic center-of-mass motion induced population amplitude interference in the presence of the light field that simultaneously minimizes all high (n≥1) diffraction orders and maximizes the zeroth diffraction component.


Nanoplasmonic Renormalization And Enhancement Of Coulomb Interactions, Maxim Durach, Anastasia Rusina, V. I. Kilmov, Mark I. Stockman Oct 2008

Nanoplasmonic Renormalization And Enhancement Of Coulomb Interactions, Maxim Durach, Anastasia Rusina, V. I. Kilmov, Mark I. Stockman

Anastasia Rusina

In this paper, we propose a general and powerful theory of the plasmonic enhancement of the many-body phenomena resulting in a closed expression for the surface plasmon-dressed Coulomb interaction. We illustrate this theory by computing the dressed interaction explicitly for an important example of metal–dielectric nanoshells which exhibits a rich resonant behavior in magnitude and phase. This interaction is used to describe the nanoplasmonic-enhanced Förster resonant energy transfer (FRET) between nanocrystal quantum dots near a nanoshell.


Fast-Responding Nonlinear Phase Shifter Using A Signal-Wave Gain Medium, K. J. Jiang, L. Deng, E. W. Hagley, Marvin G. Payne Apr 2008

Fast-Responding Nonlinear Phase Shifter Using A Signal-Wave Gain Medium, K. J. Jiang, L. Deng, E. W. Hagley, Marvin G. Payne

Marvin G. Payne

Using a full density matrix formalism we show that for a lifetime broadened four-level scheme with a signal wave gain medium a large nonlinear phase shift can be induced without signal wave slowdown and attenuation. In this system the signal wave acquires a large nonlinear phase shift and travels with superluminal propagation characteristics. This raises the possibility of rapidly responding nonlinear phase shifting and possibly phase gating devices for information science.