Omaghali, Ndubuisi Emmanuel Jude
(2013)
Nanowire Dimer Metamaterial: Design, Fabrication and Optical Characterization.
[Tesi di dottorato]
| Item Type: |
Tesi di dottorato
|
| Resource language: |
English |
| Title: |
Nanowire Dimer Metamaterial: Design, Fabrication and Optical Characterization |
| Creators: |
| Creators | Email |
|---|
| Omaghali, Ndubuisi Emmanuel Jude | omaghali@na.infn.it |
|
| Date: |
2 April 2013 |
| Number of Pages: |
90 |
| Institution: |
Università degli Studi di Napoli Federico II |
| Department: |
Fisica |
| Scuola di dottorato: |
Ingegneria industriale |
| Dottorato: |
Tecnologie innovative per materiali, sensori ed imaging |
| Ciclo di dottorato: |
25 |
| Coordinatore del Corso di dottorato: |
| nome | email |
|---|
| Lanotte, Luciano | lanotte@na.infn.it |
|
| Tutor: |
| nome | email |
|---|
| Abbate, Giancarlo | giancarlo.abbate@na.infn.it | | Tkachenko, Vladimir | tkachenko@na.infn.it | | Andreone, Antonello | andreone@unina.it |
|
| Date: |
2 April 2013 |
| Number of Pages: |
90 |
| Keywords: |
Dimer, Metamaterial, Fano resonance, dark modes, ellipsometry, sensor |
| Settori scientifico-disciplinari del MIUR: |
Area 02 - Scienze fisiche > FIS/03 - Fisica della materia |
| Aree tematiche (7° programma Quadro): |
NANOSCIENZE, NANOTECNOLOGIE, MATERIALE E PRODUZIONE > Nanoscienze e Nanotecnologie |
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| Date Deposited: |
11 Apr 2013 10:32 |
| Last Modified: |
10 Jul 2014 09:06 |
| URI: |
http://www.fedoa.unina.it/id/eprint/9550 |
Collection description
In this work we report on the electromagnetic resonances excited in a planar metamaterial
consisting of pairs of gold bars(dimers) arrayed on a dielectric substrate. In the case
of equal bar lengths, bright resonance modes can be easily excited, which couple strongly
to free space and posses a low Q-factor. The introduction of bar length asymmetry induces
the excitation of the so-called dark modes which couple very weakly to free space
and show high Q-factors. The interaction of the dark and bright resonant modes results
in a Fano type profile of the resonance. With increasing length asymmetry,
coupling of the dark modes to free space is increased, resulting in a lowered Q-factor.
We discuss the dependence of both the dark and bright modes on the dimer geometry and
refractive index of the metamaterial environment, in order to optimize the structure for
a potential application as an optical sensor. Effective material parameters were obtained from spectroscopic ellipsometry study of the metamaterial on a glass substrate and their physical meaning and applicability are discussed. Experimental results show good agreement with simulation.
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