First Advisor

Pui-Tak Leung

Term of Graduation

Spring 1997

Date of Publication


Document Type


Degree Name

Master of Science (M.S.) in Physics






Molecular dynamics -- Mathematical models, Dipole movements -- Mathematical models, Fluorescence, Surface roughness



Physical Description

1 online resource (53 pages)


The interaction between an emitting molecular dipole and a conducting substrate with a periodic surface roughness is looked at with particular interest in the different orientations of the dipole with respect to the substrate surface. A previous dynamical, perturbative theory for the effects of perpendicular dipole is extended to treat a dipole oriented parallel to the surface of the substrate. The results are then applied to study the modified fluorescence characteristics of the emitting dipoles. Numerical results demonstrate that some fluorescence characteristics are extremely sensitive to the molecular orientation with the dipole oriented along the grating (x direction) exhibiting unique behavior. One possible consequence of the interaction is the lengthening of molecular fluorescence lifetimes by manipulating the parameters of the system. Also, the usual step for averaging the orientations for experimental values is scrutinized.


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