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Proceedings Paper

Optical activity of catalytic elements of hetero-metallic nanostructures
Author(s): Tomasz J. Antosiewicz; S. Peter Apell; Carl Wadell; Christoph Langhammer
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Paper Abstract

Interaction of light with metals in the form of surface plasmons is used in a wide range of applications in which the scattering decay channel is important. The absorption channel is usually thought of as unwanted and detrimental to the efficiency of the device. This is true in many applications, however, recent studies have shown that maximization of the decay channel of surface plasmons has potentially significant uses. One of these is the creation of electron-hole pairs or hot electrons which can be used for e.g. catalysis. Here, we study the optical properties of hetero-metallic nanostructures that enhance light interaction with the catalytic elements of the nanostructures. A hybridized LSPR that matches the spectral characteristic of the light source is excited. This LSPR through coupling between the plasmonic elements maximizes light absorption in the catalytic part of the nanostructure. Numerically calculated visible light absorption in the catalytic nanoparticles is enhanced 12-fold for large catalytic disks and by more 30 for small nanoparticles on the order of 5 nm. In experiments we measure a sizable increase in the absorption cross section when small palladium nanoparticles are coupled to a large silver resonator. These observations suggest that heterometallic nanostructures can enhance catalytic reaction rates.

Paper Details

Date Published: 5 May 2015
PDF: 8 pages
Proc. SPIE 9502, Metamaterials X, 95020D (5 May 2015); doi: 10.1117/12.2180045
Show Author Affiliations
Tomasz J. Antosiewicz, Univ. of Warsaw (Poland)
Chalmers Univ. of Technology (Sweden)
S. Peter Apell, Chalmers Univ. of Technology (Sweden)
Carl Wadell, Chalmers Univ. of Technology (Sweden)
Christoph Langhammer, Chalmers Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 9502:
Metamaterials X
Vladimír Kuzmiak; Peter Markos; Tomasz Szoplik, Editor(s)

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