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Search Publications by: Garnett W. Bryant (Fed)

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Displaying 76 - 100 of 176

Light Scattering in Gold Nanorings

November 1, 2004
Author(s)
Javier Aizpurua, L A. Blanco, P Hanarp, D S. Sutherland, M Kall, Garnett W. Bryant, F J. de Abajo
The optical response of gold nanoparticles of disk-like and ring-like shape is studied by analyzing their extinctioncross section in the visible and near infrared regions. A strong dependence of the excitation modes on the actual geometry of the

Optical Excitation and Absorption Spectra of C 50 Cl 10

August 1, 2004
Author(s)
Rui-Hua Xie, Garnett W. Bryant, J Cheung, V H. Smith, J Zhao
Recent experiment has synthesized C 50Cl 10 [S.Y. Xie et al., Science 304, 699 (2004)] in a large quantity capturing the labile fullerene C 50. In this Communication, we report ab initio calculations on the optical excitation and absorption spectra of C

Tuning Spectral Properties of Fullerenes by Substitutional Doping

May 1, 2004
Author(s)
Rui-Hua Xie, Garnett W. Bryant, G Sun, T Kar, Z Chen, V H. Smith, Y Araki, N Tagmatarchis, H Shinohara, O Ito
We propose a substitutional doping approach to achieve tunable optical properties from fullerenes. Taking Cd60 as an example and using time-dependent density functional theory, we compute the absorption spectra of heterofullerenes Cd60-dn-dm-NdnBdm, and

Nanocrystal Molecules and Chains

October 1, 2003
Author(s)
J F. Diaz, W Jaskolski, J Planelles, Javier Aizpurua, Garnett W. Bryant
The electron energy structure of linear artificial molecules and one-dimensional chains formed of spherical semiconductor nanocrystals is investigated with and without and applied magnetic field. Both uniform and multilayer nanocrystals are studied. The

Fourier Analysis Near-Field Polarimetry for Measurement of Local Optical Properties of Thin Films

July 1, 2003
Author(s)
Lori S. Goldner, Michael J. Fasolka, S Nougier, H P. Nguyen, Garnett W. Bryant, Jeeseong Hwang, K D. Weston, Kathryn L. Beers, A Urbas, Edwin L. Thomas
We present measurements of the local dichroism and birefringence of thin film specimens us ing techniques that combine near-field scanning optical microscopy (NSOM) and a novel polarization modulation (PM) polarimetry utilizing Fourier analysis of the

Structural, Electronic, and Magnetic Properties of Heterofullerene C 48 B 12

July 1, 2003
Author(s)
Rui-Hua Xie, L Jensen, Garnett W. Bryant, J Zhao, V H. Smith
Bonding, electric (hyper) polarizability; vibrational and magnetic properties of heterofullerene C 48B 12 are studied by first-principles calculations. Infrared- and Raman-active vibrational frequencies of C 48B 12 are assigned. Eight 13C and two 11B

Tunnel-Coupled Quantum Dots: Atomistic Theory of Quantum Dot Molecules and Arrays

June 1, 2003
Author(s)
Garnett W. Bryant, Javier Aizpurua, W Jaskolski, M Zielinski
An understanding of how dots couple in quantum dot molecules and arrays is needed so that the possibilities for tailored nanooptics in these systems can be explored. The properties of tunnel-coupled dots will be determined by how the dots couple through

Electronic Properties of Quantum-Dot Molecules

April 1, 2003
Author(s)
W Jaskolski, M Zielinski, Garnett W. Bryant
We investigate the electronic structure of several double quantum dot systems: (I) hetero-dot artificial molecules built from two CdS chemically synthesized nanocrystals and (ii) two vertically stacked pyramidal self-organized InAs/GaAs quantum dots. The

Raman Scattering in C 60 and C 48 N 12 Aza-Fullerene: First-Principles Study

April 1, 2003
Author(s)
R H. Xie, Garnett W. Bryant, V H. Smith
We carry out large-scale ab initio calculations of Raman scattering activity and Raman-active frequencies (RAF s) in C 48 N 12 aza-fullerene. Th results are compared with those of C 60. Twenty-nine non-degenerate polarized and 29 doubly degenerate

Optical Properties of Gold Nanorings

February 1, 2003
Author(s)
Javier Aizpurua, P Hanarp, D S. Sutherland, Garnett W. Bryant, F J. Garcia de Abajo, M Kall
The optical response of ring-shaped gold nanoparticles prepared by colloidal lithography is investigated. Compared to solid gold particles of similar size, nanorings exhibit a redshifted localized surface plasmon that can be tuned over an extended
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