Fractal plasmonics: subdiffraction focusing and broadband spectral response by a Sierpinski nanocarpet
Metadata only
Date
2011-02-14Type
- Journal Article
ETH Bibliography
no
Altmetrics
Abstract
Plasmonic nanostructures offer a great potential to enhance light-matter interaction at the nanometer scale. The response upon illumination at a given wavelength and polarization is governed by the characteristic lengths associated to the shape and size of the nanostructure. Here, we propose the use of engineered fractal plasmonic structures to extend the degrees of freedom and the parameters available for their design. In particular, we focus on a paradigmatic fractal geometry, namely the Sierpinski carpet. We explore the possibility of using it to achieve a controlled broadband spectral response by controlling the degree of its fractal complexity. Furthermore, we investigate some other arising properties, such as subdiffraction limited focusing and its potential use for optical trapping of nano-objects. An attractive advantage of the focusing over more standard geometries, such as gap antennas, is that it occurs away from the metal surface (≈ 80nm) at the center of the nanostructure, leaving an open space accessible to objects for enhanced light-matter interaction. © 2011 Optical Society of America. Show more
Publication status
publishedExternal links
Journal / series
Optics ExpressVolume
Pages / Article No.
Publisher
Optical Society of AmericaOrganisational unit
09698 - Quidant, Romain / Quidant, Romain
More
Show all metadata
ETH Bibliography
no
Altmetrics