Garnett W. Bryant

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The optical properties of coupled metallic nanorods are studied to investigate the use of coupled plasmonic structures in field-enhanced spectroscopies. Light scattering by coupled nanorods is calculated with the boundary element method, including retardation. The modes of coupled nanorod systems are calculated by the boundary charge method and discussed in(More)
This is the second in a series of articles describing a wide variety of projects at NIST that synergistically combine physical science and information science. It describes, through examples, how the Scientific Applications and Visualization Group (SAVG) at NIST has utilized high performance parallel computing, visualization, and machine learning to(More)
An automated Fourier Transform Spectroscopic (FTS) solar observatory was established in Darwin, Australia in August 2005. The laboratory is part of the Total Carbon Column Observing Network, and measures atmospheric column abundances of CO 2 and O 2 and other gases. Measured CO 2 columns were calibrated against integrated aircraft profiles obtained during(More)
Many-body levels of optically excited and multiply charged InAs nanocrystals are studied with the semi-empirical tight-binding model. Single-particle levels of unstrained spherical InAs nanocrystals are described by the sp 3 d 5 s* nearest-neighbor tight-binding model including spin-orbit coupling. For optically excited InAs nanocrystals, first-order(More)
The electron-hole states of semiconductor quantum dots are investigated within the framework of empirical tight-binding descriptions for Si, as an example of an indirect-gap material, and InAs and CdSe as examples of typical III-V and II-VI direct-gap materials. We significantly improve the energies of the single-particle states by optimizing tight-binding(More)
This is the third in a series of articles that describe, through examples, how the Scientific Applications and Visualization Group (SAVG) at NIST has utilized high performance parallel computing, visualization, and machine learning to accelerate scientific discovery. In this article we focus on the use of high performance computing and visualization for(More)
This study investigated differences in stress by sex, levels, age, and job classifications as perceived by 173 professionals. Subjects responded to the Tennessee Stress Scale-L questionnaire which provides measures for the three subscales (Stress Producers, Coping Mechanisms, and Stress Symptoms) and Total Stress. Significant differences were found between(More)
A theory is presented to show how near-field optical microscopy can be used to probe quantum nanostructures. Calculations are done for a quantum dot. Results for different tip/dot configurations and sizes show that near-field exci-tation can enhance light-hole transitions, excite selection-rule breaking transitions with rates comparable to allowed(More)
First-principles calculations of the structural, electronic, vibrational and magnetic properties of C 60 and C 48 N 12 : a comparative study We perform first-principles calculations of the structural, electronic, vibrational and magnetic properties of the C48N12 azafullerene and C60. Full geometrical optimization shows that C48N12 is characterized by(More)