Authors
Claire Deeb, Xuan Zhou, Ryan Miller, Stephen K. Gray, Sylvie Marguet, Jérôme Plain, Gary P. Wiederrecht, Renaud Bachelot,
Title
Mapping the electromagnetic near-field enhancements of gold nanocubes
In
Journal of Physical Chemistry C
Volume
116
Issue
46
Pages
24734–24740
Publisher
American Chemical Society
Year
2012
Publisher's URL
http://pubs.acs.org/doi/abs/10.1021/jp304647e
Indexed by
Abstract
We imaged and quantitatively characterized electromagnetic hot spots near the surfaces of plasmon resonant gold nanocubes. The strongest fields are localized at the nanocube corners as compared to those on the sides. The near-field enhancement on the surface of the cube was imaged as a function of incident polarization, leading to information on the localization of fields on specific regions on the surface. We found that the field intensity drops dramatically when the nanocube corner is slightly tilted with respect to the incident laser polarization. This dramatic dependence on angle was verified by electrodynamics simulations. These results will enable the use of gold nanocubes in field enhancement applications and refractive-index sensing.
Affiliations
Offprint