期刊
NANO LETTERS
卷 12, 期 3, 页码 1333-1339出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl300269c
关键词
Nanoparticle dimer; quantum plasmonics; field enhancement; nonlinear effects
类别
资金
- Department of Industry of the Basque Government through the ETORTEK
- Spanish Ministerio de Ciencia e Innovacioon [FIS2010-19609-C02-01, EUI2008-03816]
- Robert A. Welch Foundation [C-1222]
- Office of Naval Research [N00014-10-1-0989]
A fully quantum mechanical investigation using time-dependent density functional theory reveals that the field enhancement in a coupled nanoparticle dimer can be strongly affected by nonlinear effects. We show that both classical as well as linear quantum mechanical descriptions of the system fail even for moderate incident light intensities. An interparticle current resulting from the strong field photo emission tends to neutralize the plasmon-induced surface charge densities on the opposite sides of the nanoparticle junction. Thus, the coupling between the two nanoparticles and the field enhancement is reduced as compared to linear theory. A substantial nonlinear effect is revealed already at incident powers of 10(9) W/cm(2) for interparticle separation distances as large as 1 nm and down to the touching limit.
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