Electronic Theses and Dissertations

Identifier

6612

Author

Negar Charchi

Date

2020

Date of Award

7-30-2020

Document Type

Thesis

Degree Name

Master of Science

Major

Physics

Concentration

Materials Science

Committee Member

Thang Hoang

Committee Member

Xiao Shen

Committee Member

Chenhui Peng

Abstract

Star-shaped gold nano-particles with sharp spikes, Au nanorods, and silver nanocubes are considered as plasmonic particles. We investigate the plasmon resonances of an individual gold nanostar coupled to a gold film, separated by a dielectric layer. Through dark field scattering measurements of many individual nanostars, a statistical observation of the scattered spectra is obtained and compared with extensive simulation data to reveal the origins of the resonant peaks. We observe that an individual nanostar on a flat gold film can result in a resonant spectrum with single, double or multiple peaks. Further, these resonant peaks are strongly polarized under white light illumination. Results of plasmonic resonances of single nanorods and nanocubes on a gold film and a glass slide are also presented. Our results demonstrate a simple method to create an ultrasmall mode volume plasmonic platform which could be useful for applications in sensing or enhanced light-matter interactions.

Comments

Data is provided by the student.

Library Comment

dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.

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