Date of Award

8-2009

Degree Type

Thesis

Degree Name

Master of Science

Major

Physics

Major Professor

Zhenyu Zhang

Committee Members

Lee Riedinger, Hanno Weitering, Robert Compton

Abstract

Much recent effort has been devoted to the study of the optical properties of metal nanoparticle substrates. In such finely ordered structures, surface plasmons can be induced by incident light. These collective excitations of the electrons in the nanoparticle create localized areas of high electromagnetic field intensity. The intense local fields generated are of interest for various applications, including Surface-enhanced Raman Scattering (SERS) for molecular detection and sensing. In this thesis, the optical properties of various nanoparticle dimer and array geometries are considered, including gold triangular prism dimers and silver spherical dimers. The effect of SERS due to electromagnetic interaction of the metal nanoparticles with incident light is computed using the finite-difference time-domain (FDTD) method. These results are compared with those from generalized Mie theory simulations and recent experimental work. The positions, wavelengths, and magnitudes of maximum electric field enhancement for different geometries are presented. These findings may serve as important guidance in future design of nanoplasmonic devices.

Files over 3MB may be slow to open. For best results, right-click and select "save as..."

Included in

Physics Commons

Share

COinS