Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Opt Express. 2010 Jul 5;18(14):14802-11. doi: 10.1364/OE.18.014802.

Demonstration of scattering suppression in retardation-based plasmonic nanoantennas.

Author information

  • 1Institute of Sensors, Signals and Electrotechnics, University of Southern Denmark, Niels Bohrs AllĂ© 1, DK-5230, Odense M, Denmark. mgni@sense.sdu.dk

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.

PMID:
20639967
[PubMed]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for Optical Society of America
    Loading ...
    Write to the Help Desk