Electromagnetic interaction between a metallic nanoparticle and surface in tunnelling proximity modelling and experiment
Abstract
We simulate the localized surface plasmon resonances of an Au nanoparticle within tunneling proximity of a Au substrate and demonstrate that the modes may be identified with those responsible for light emission from a scanning tunneling microscope. Relative to the modes of an isolated nanoparticle these modes show significant red-shifting, extending further into the infrared with increasing radius, primarily due to a proximity-induced lowering of the effective bulk plasmon frequency. Spatial mapping of the field enhancement factor shows an oscillatory variation of the field, absent in the case of a dielectric substrate; also the degree of localization of the modes, and thus the resolution achievable electromagnetically, is shown to depend primarily on the nanoparticle radius with only a weak dependence on wavelength.
Cite
@article{arxiv.0907.0201,
title = {Electromagnetic interaction between a metallic nanoparticle and surface in tunnelling proximity modelling and experiment},
author = {J. Mitra and Lei Feng and Michael G. Boyle and P. Dawson},
journal= {arXiv preprint arXiv:0907.0201},
year = {2012}
}