Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Volume 214, 2019
Previous Article Next Article

Direct optical excitation of dark plasmons for hot electron generation

Author affiliations

Abstract

An ideal plasmonic system for hot-electron generation allows the optical excitation of plasmons, limits radiation losses, exhibits strong non-radiative electron damping, and is made from scalable and cost-effective materials. Here we demonstrate the optical excitation of dark interlayer plasmons in bilayers of colloidal gold nanoparticles. This excitation is created by an antiparallel orientation of the dipole moments in the nanoparticle layers; it is expected to exhibit strongly reduced radiative damping. Despite the vanishing dipole moment, an incoming electromagnetic wave that is propagating normal to the surface will excite the dark mode due to field retardation. We observe a strong peak in the absorption spectrum of a colloidal gold bilayer (nanoparticle diameter = 46 nm); this peak is absent for a nanoparticle monolayer. The full width at half maximum of the dark mode is 230 meV for an ideal nanoparticle crystal and 320 meV for the structure produced by self-assembly out of solution. The position and width of the dark plasmon are efficiently tailored by the interparticle distance within the layer, nanoparticle size and layer number. We present time-resolved pump and probe experiments of hot-electron generation by bright and dark bilayer nanoparticle modes.

Graphical abstract: Direct optical excitation of dark plasmons for hot electron generation

Back to tab navigation

Associated articles

Article information


Submitted
09 Oct 2018
Accepted
12 Nov 2018
First published
12 Nov 2018

Faraday Discuss., 2019,214, 159-173
Article type
Paper

Direct optical excitation of dark plasmons for hot electron generation

N. S. Mueller, B. G. M. Vieira, D. Höing, F. Schulz, E. B. Barros, H. Lange and S. Reich, Faraday Discuss., 2019, 214, 159
DOI: 10.1039/C8FD00149A

Social activity

Search articles by author

Spotlight

Advertisements