Jung, Yun-suk
(2011)
Study of Plasmonic Phenomena in Metal Nanostructure Arrays.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Metal nanostructures have received considerable attention for their ability to guide and manipulate light at the nanometer scale. As in the case of electronics, scaling down the dimensions of photonic devices is expected to bring numerous benefits in terms of speed, capacity, and energy efficiency in information processing. Surface plasmons, collective oscillation of electrons excited by light, are basically photon waves trapped/squeezed at a metal/dielectric interface. The reduced size in electromagnetic field distribution offers a potential for nanoscale reduction of photonic devices. The intrinsic coupling between electrons and photons also offers a potential for merging electronics and photonics on the same platform.In this thesis, we have investigated metallic nanostructures as a medium for plasmonic interactions. Surface plasmons excited on a metallic structure can produce many interesting phenomena that can be observed in the near-field to far-field regime. We have studied the anomalous behavior of surface plasmons that are excited in a resonant cavity structure of a metal nanoslit array. We show that modification of a metal nanoslit array by a self-assembled monolayer of molecules can give rise to a blue-shift in the peak transmission wavelength. A simple model was developed to predict the wavelength shift and its sign. We have characterized the near- to far-field distribution of optical wavefronts emanating from a nanoslit formed in a thin silver film. The evolution of optical phases was imaged using a self-interference technique in conjunction with a scanning probe method. The phase relationship of the slit-transmitted waves with respect to the direct transmission through the thin metal film is quantitatively established. We have investigated negative refraction of visible light that does not involve any negative-index media. The interfacial negative refraction without bulk media, demonstrated in this thesis, offers a promising approach to accessing angular ranges that have not been reachable in conventional optics.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
3 August 2011 |
| Date Type: |
Completion |
| Defense Date: |
22 July 2009 |
| Approval Date: |
3 August 2011 |
| Submission Date: |
15 July 2009 |
| Access Restriction: |
5 year -- Restrict access to University of Pittsburgh for a period of 5 years. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Electrical Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Anomalous dispersion; Diffractive optics; Metal nanostructures; Metal optics; Negative refraction; Surface plasmons |
| Other ID: |
http://etd.library.pitt.edu/ETD/available/etd-07152009-134522/, etd-07152009-134522 |
| Date Deposited: |
10 Nov 2011 19:51 |
| Last Modified: |
15 Nov 2016 13:45 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/8385 |
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