The fundamental optical properties of pure nickel nanostructures are studied by far-field extinction spectroscopy and optical near-field microscopy, providing direct experimental evidence of the existence of particle plasmon resonances predicted by theory. Experimental and calculated near-field maps allow for unambiguous identification of dipolar plasmon modes. By comparing calculated near-field and far-field spectra, dramatic shifts are found between the near-field and far-field plasmon resonances, which are much stronger than in gold nanoantennas. Based on a simple damped harmonic oscillator model to describe plasmonic resonances, it is possible to explain these shifts as due to plasmon damping.
Autori: | |
Data di pubblicazione: | 2011 |
Titolo: | Plasmonic Nickel Nanoantennas |
Rivista: | SMALL |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1002/smll.201100640 |
Volume: | 7 |
Appare nelle tipologie: | 2.1 Articolo su rivista |