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Enhanced third harmonic generation from the epsilon-near-zero modes of ultrathin films

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arxiv 1502.04142 v1 pith:J47J4RGB submitted 2015-02-13 physics.optics cond-mat.mes-hall

Enhanced third harmonic generation from the epsilon-near-zero modes of ultrathin films

Ting S. Luk , Domenico de Ceglia , Sheng Liu , Gordon A. Keeler , Rohit P. Prasankumar , Maria A. Vincenti , Michael Scalora , Michael B. Sinclair
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Salvatore Campione
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classification physics.optics cond-mat.mes-hall
keywords conversionenhancementepsilon-near-zerogenerationharmonicmaterialsthirdachieved
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We experimentally demonstrate efficient third harmonic generation from an indium tin oxide (ITO) nanofilm (lambda/42 thick) on a glass substrate for a pump wavelength of 1.4 um. A conversion efficiency of 3.3x10^-6 is achieved by exploiting the field enhancement properties of the epsilon-near-zero (ENZ) mode with an enhancement factor of 200. This nanoscale frequency conversion method is applicable to other plasmonic materials and reststrahlen materials in proximity of the longitudinal optical phonon frequencies.

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