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Search Publications by: Garnett W. Bryant (Fed)

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Displaying 76 - 100 of 338

Approaching the quantum limit for plasmonics: linear atomic chains

May 18, 2016
Author(s)
Garnett W. Bryant
Optical excitations in atomic scale materials can be strongly mixed, having contributions from both single-particle transitions and collective response. This complicates the quantum description of these excitations, because there is no clear way to define

Which resonances in small metallic nanoparticles are plasmonic?

November 3, 2014
Author(s)
Emily Townsend, Garnett W. Bryant
We use time-dependent density functional theory to examine the character of various resonances corresponding to peaks in the optical response of small metallic nanoparticles. Each resonance has both "sloshing" and "inversion" character. The sloshing mode

Strong coupling of single emitters interacting with phononic infrared antennae

January 30, 2014
Author(s)
Ruben Esteban, Javier Aizpurua, Garnett W. Bryant
A single emitter can couple with an electromagnetic mode excited in dielectric cavities or metallic particles. In a similar manner, it can couple with a phononic mode supported by a nearby infrared antenna. We consider an emitter with a sufficiently large

Mechanism for controlling the exciton fine structure in quantum dots using electric fields: Manipulation of exciton orientation and exchange splitting at the atomic scale

October 7, 2013
Author(s)
Garnett W. Bryant, Natalia Malkova, James S. Sims
We use atomistic tight-binding theory with a configuration interaction description of Coulomb and exchange effects to describe excitons in quantum dots in a vertical electric field. We show that field-induced manipulation of exciton orientation and phase

Comparison of the Sensitivity and Image Contrast in Spontaneous Raman and Coherent Stokes Raman Scattering Microscopy of Geometry Controlled Samples

February 9, 2011
Author(s)
Hyun M. Kim, Chris A. Michaels, Garnett W. Bryant, Stephan J. Stranick
We experimentally compare the performance and contrast differences between spontaneous and coherent Stokes Raman scattering microscopy. We demonstrate the differences on a series of geometry controlled samples that range in complexity from a point (array

Effect of Surface Modes on Photon Propagation through Dielectric Bandgaps

October 28, 2009
Author(s)
Natalia Malkova, Sergey V. Polyakov, Alan L. Migdall, Garnett W. Bryant
We investigate the Hartman saturation effect of photons traveling through barriers created by bandgaps of multilayer stacks. In particular, we investigate theoretically the recently observed jumps in photon transversal times due to adding a single layer

Comment on 'Laterally Squeezed Excitonic Wave Function in Quantum Wires'

October 16, 2008
Author(s)
Garnett W. Bryant, Y B. Band, Paul S. Julienne
Recent magnetophotoluminescence data on T-shaped quantum wires is reinterpreted based on a detailed theory of magnetoexcitons in T-shaped quantum wires. We show that the previous analysis greatly overestimates exciton squeezing in T-shaped wires.

Comment on Intrinsic Gap States in Semiconductor Nanocrystals

October 16, 2008
Author(s)
W Jaskolski, R -. Oszwaldowski, Garnett W. Bryant
We comment on the paper Intrinsic Gap States in Semiconductor Nanocrystals. We show that the predicted gap states are nanphysical and should not be used to interpret data.