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Phys Chem Chem Phys. 2016 Oct 5;18(39):27493-27499.

Morphological modulation of graphene-mediated hybridization in plasmonic systems.

Author information

1
OptMatLab, Dipartimento di Fisica, Università degli Studi di Genova, via Dodecaneso 33, 16146 Genova, Italy.
2
CNR-SPIN, C.so Perrone 24, 16152 Genova, Italy. francesco.bisio@spin.cnr.it.
3
Center for Nanotechnology Innovation@NEST, Istituto Italiano di Tecnologia, Piazza S. Silvestro 12, 56127 Pisa, Italy.
4
Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
5
Center for Nanotechnology Innovation@NEST, Istituto Italiano di Tecnologia, Piazza S. Silvestro 12, 56127 Pisa, Italy and Graphene Labs, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
6
CNR-IOM Laboratorio TASC, Basovizza SS-14, Km 163-5, 34012 Trieste, Italy and Dipartimento di Fisica, Università di Trieste, Trieste, Italy.

Abstract

We investigated the plasmonic response of a 2-dimensional ordered array of closely spaced (few-nm apart) Au nanoparticles covered by a large-area single-layer graphene sheet. The array consisted of coherently aligned nanoparticle chains, endowed with a characteristic uniaxial anisotropy. The joint effect of such a morphology and of the very small particle size and spacing led to a corresponding uniaxial wrinkling of graphene in the absence of detectable strain. The deposition of graphene redshifted the Au plasmon-resonance, strongly increased the optical absorption of the array and, most importantly, induced a marked optical anisotropy in the plasmonic response, absent in the pristine nanoparticle array. The experimental observations are accounted for by invoking a graphene-mediated resistive coupling between the Au nanoparticles, where the optical anisotropy arises from the wrinkling-induced anisotropic electron mobility in graphene at optical frequencies.

PMID:
27711546
DOI:
10.1039/c6cp05107c

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