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Nonperturbative hydrodynamic model for multiple harmonics generation in metallic nanostructures

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)8-13
Number of pages6
JournalNature Photonics
Volume2
Issue number1
Early online date12 Dec 2014
DOIs
Publication statusPublished - 21 Jan 2015

King's Authors

Abstract

The electromagnetic response of a free-electron gas leads to the inherent nonlinear optical behavior of nanostructured plasmonic materials enabled through both strong local field enhancements and complex collective electron dynamics. Here, a time-domain implementation of the hydrodynamic model for conduction electrons in metals has been developed to enable nonperturbative studies of nonlinear coherent interactions between light and plasmonic nanostructures. The effects originating from the convective acceleration, the magnetic contribution of the Lorenz force, the quantum electron pressure, and the presence of the nanostructures boundaries have been taken into account, leading to the appearance of both second and third harmonics. The proposed time-domain method enables obtaining a universal, self-consistent numerical solution, free from any approximations, allowing investigations of nonlinear optical interactions with arbitrary spatially and temporally shaped optical pulses, opening unique opportunities to approach description of realistic experimental scenarios.

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