Nanoshell Image Plasmons
Abstract
We have investigated the modifications in the plasmon response of nanoshells (dielectric core-metal shell nanoparticles) when positioned adjacent to a metal surface. It is well established that the presence of a metal surface nearby an excited dipole induces both a change in the resonant frequency and damping rate of the dipole [1]. The resonant plasmon excitation of an isolated nanoshell above a metal surface induces an image nanoshell plasmon in the metal substrate. For s-polarized incident light, the image plasmon induces a small shift in the resonance of the nanoshell plasmon. However with p-polarized light, a strong second resonance appears at lower energy relative to the isolated plasmon response. This new plasmon resonance is attributed to the hybridization of the nanoshell plasmon [2] with its image plasmon. Similarities between this image response and the hybridized plasmon response of nanoshell dimers will be discussed. [1] R. R. Chance, A. Prock, and R. Silbey, Advances in Chem. Phys. 37 (1978). [2] E. Prodan, C. Radloff, N. J. Halas, and P. Nordlander, Science 302, 419 (2003).
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARJ36005S