Probing Plasmonic Gap Resonances between Gold Nanorods and a Metallic Surface
2015 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 119, no 32, 18627-18634 p.Article in journal (Refereed) Published
The plasmonic resonances in individual gold nanorods nanoscopically coupled to a gold film with different gap spacing have been experimentally and theoretically investigated. The spectral widths, wavelengths, and optical polarizabilities of the maxima in measured single-nanopartide scattering spectra are significantly modified as the gap distance changes in the sub-20 nm domain. Comparing the experimental data with numerical simulations reveals that these modifications arise from the complex hybridization of several dipolar and multipolar plasmon modes that are strongly localized at the gap. These plasmon gap modes have distinct resonant and spatial characteristics as a result of near-field interaction between the elongated nanorods and the gold film. Additionally, the excitation of these gap modes is highly dependent on the gap spacing. Finally, we also discuss influences of these plasmonic modes on absorption properties of the system and propose a potential application of the studied structures in facilitating photothermal conversion.
Place, publisher, year, edition, pages
2015. Vol. 119, no 32, 18627-18634 p.
IdentifiersURN: urn:nbn:se:kth:diva-173264DOI: 10.1021/acs.jpcc.5b06006ISI: 000359683800068ScopusID: 2-s2.0-84939129531OAI: oai:DiVA.org:kth-173264DiVA: diva2:852599
QC 201509092015-09-092015-09-092015-09-09Bibliographically approved