Issue 4, 2013
From the journal:

Nanoscale

Nanorod orientation dependence of tunable Fano resonance in plasmonic nanorod heptamers

Venkata Ananth Tamma,a   Yonghao Cui,a   Jianhong Zhoua  and  Wounjhang Park*a  

* Corresponding authors

a Department of Electrical, Computer and Energy Engineering, University of Colorado Boulder, Boulder, Colorado, USA
E-mail: won.park@colorado.edu
Fax: +1 303-492-2758
Tel: +1 303-735-3601

Abstract

We present orientation dependence and tuning of Fano resonances in plasmonic gold nanorod heptamer nanostructures. The heptamer structures were formed by surrounding a central circular nanoparticle by six satellite nanorods in a hexagonal arrangement and the heptamer structures were then embedded in a thin flexible membrane. The Fano resonance was found to depend on the orientation of the nanorods within the heptamer and for a given orientation, the Fano resonance was dynamically tuned and its symmetry lowered by application of uniaxial mechanical stress. The expected spectral features were obtained by simulations and verified by experiments. The spectral features of the heptamer structures were further characterized by using detailed group theoretical analysis. We show that both sub-structural and mechanical tuning could be employed to engineer the Fano resonances in complex plasmonic molecules.

Graphical abstract: Nanorod orientation dependence of tunable Fano resonance in plasmonic nanorod heptamers

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Article information

DOI
https://doi.org/10.1039/C2NR33292B
Article type
Paper
Submitted
23 Oct 2012
Accepted
12 Dec 2012
First published
13 Dec 2012

Nanoscale, 2013,5, 1592-1602

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Nanorod orientation dependence of tunable Fano resonance in plasmonic nanorod heptamers

V. A. Tamma, Y. Cui, J. Zhou and W. Park, Nanoscale, 2013, 5, 1592 DOI: 10.1039/C2NR33292B

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