Demonstration of scattering suppression in retardation-based plasmonic nanoantennas
Date of this Version
7-2010Citation
Optics Express Vol. 18, Issue 14, pp. 14802-14811 (2010)
This document has been peer-reviewed.
Abstract
Modifications in scattering strength of and local field enhancement by retardation-based plasmonic nanoantennas when being transformed from straight nanorods to split-ring resonators are investigated experimentally. Scattering properties are characterized with linear reflection and extinction spectroscopy of nanoantenna arrays, whereas local field enhancements are evaluated for individual nanoantennas using two-photon-excited photoluminescence (TPL) microscopy. The linear and nonlinear optical characterizations reveal that the optical response of nanoantennas is determined by the interference of counter-propagating short-range surface plasmon polaritons (SR-SPP) and that the transformation of nanorods into split-rings by bending significantly influences the scattering strength. Importantly, strong suppression of scattering for the fundamental SR-SPP resonance is observed when the bend radius is decreased, a feature that is attributed to the decrease in the nanoantenna electric-dipole response when bending the nanorods. The experimental observations are corroborated with numerical simulations using the finite-element method.
Discipline(s)
Engineering | Nanoscience and Nanotechnology
Comments
Michael G. Nielsen, Anders Pors, Rasmus B. Nielsen, Alexandra Boltasseva, Ole Albrektsen, and Sergey I. Bozhevolnyi. Demonstration of scattering suppression in retardation-based plasmonic nanoantennas. Optics Express Vol. 18, Issue 14, pp. 14802-14811 (2010). https://doi.org/10.1364/OE.18.014802