Sun, Zhijun
(2005)
Study of Metallic Nano-Optic Structures.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Physical phenomena (optical, electronic and optoelectronic) occurring in metallic nanostructures offer an interesting potential in that they may allow us to overcome the limits of diffractive optics and to develop new functional devices complementing the dielectric-based conventional optics. Optical waves incident to a metallic structure, for example, can excite a collective oscillation of electrons, so-called surface plasmons (SPs). The spatial extension of SP fields is governed by the size of the nanostructure and can be made much smaller than the wavelength of light. These features are potentially useful in developing ultracompact photonic chips, i.e., miniaturizing the optics into subwavelength dimensions.In this thesis, we have investigated the plasmonic phenomena occurring in metallic nanoaperture array structures. A novel fabrication process has been developed to form highly ordered nanoaperture (both slits and holes) arrays on metallic layers. Optical characterization of the fabricated nanostructures revealed many interesting properties (in transmission, reflection, filtering, confinement, etc.) involving plasmonic interactions. The plasmonic phenomena in nanoaperture arrays have been analyzed theoretically: analytical solutions of plasmonic waveguiding inside nanoslits were formulated; funneling of light into nanoslit was simulated; the in-plane surface plasmon band structures at the metal/dielectric interfaces were modeled; the dynamic evolution of polarization in metal islands was analyzed. The finite-difference time-domain (FDTD) analysis of optical field distribution and propagation has been performed, and the simulation results were compared with the analytic results and experimental data. Detailed mechanisms of the plasmonic interactions in nanoaperture arrays have been developed and proposed based on this experimental and theoretical study.We further studied optical transmission properties of bi-layer metallic nanoslit arrays. The structure is found to reveal Fabry-Perot-resonator-like characteristics and the transmittance, passband, and beam polarization properties are determined by structure, dimension, and configuration. Near-field interaction and coupling in the bi-layer slit array structures were also analyzed with FDTD simulation. We also studied surface plasmon effects in reflective metallic grating structures, which show strong reflection quenching under cross-metal SP coupling conditions. We have designed and analyzed metallic nano-optic lenses based on nanoslit array structures. The phase of optical radiation emanating from each aperture is controlled by the metal thickness and aperture size. FDTD simulation of the nano-optic lenses demonstrates refractive transmission of light and beam shaping (focusing and collimation). This study opens up the possibility of developing a new class of optics that can complement the conventional dielectric-based refractive/diffractive optics.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
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| ETD Committee: |
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| Date: |
14 October 2005 |
| Date Type: |
Completion |
| Defense Date: |
15 February 2005 |
| Approval Date: |
14 October 2005 |
| Submission Date: |
21 February 2005 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| 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: |
Lens; Metal; Nano-Optics; Nanostructure; surface plasmons; Transmission |
| Other ID: |
http://etd.library.pitt.edu/ETD/available/etd-02212005-104021/, etd-02212005-104021 |
| Date Deposited: |
10 Nov 2011 19:31 |
| Last Modified: |
15 Nov 2016 13:36 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/6385 |
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