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Viscoelastic optical nonlocality of low-loss epsilon-near-zero nanofilms.


ABSTRACT: Optical nonlocalities are elusive and hardly observable in traditional plasmonic materials like noble and alkali metals. Here we report experimental observation of viscoelastic nonlocalities in the infrared optical response of epsilon-near-zero nanofilms made of low-loss doped cadmium-oxide. The nonlocality is detectable thanks to the low damping rate of conduction electrons and the virtual absence of interband transitions at infrared wavelengths. We describe the motion of conduction electrons using a hydrodynamic model for a viscoelastic fluid, and find excellent agreement with experimental results. The electrons' elasticity blue-shifts the infrared plasmonic resonance associated with the main epsilon-near-zero mode, and triggers the onset of higher-order resonances due to the excitation of electron-pressure modes above the bulk plasma frequency. We also provide evidence of the existence of nonlocal damping, i.e., viscosity, in the motion of optically-excited conduction electrons using a combination of spectroscopic ellipsometry data and predictions based on the viscoelastic hydrodynamic model.

SUBMITTER: de Ceglia D 

PROVIDER: S-EPMC6008458 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Viscoelastic optical nonlocality of low-loss epsilon-near-zero nanofilms.

de Ceglia Domenico D   Scalora Michael M   Vincenti Maria A MA   Campione Salvatore S   Kelley Kyle K   Runnerstrom Evan L EL   Maria Jon-Paul JP   Keeler Gordon A GA   Luk Ting S TS  

Scientific reports 20180619 1


Optical nonlocalities are elusive and hardly observable in traditional plasmonic materials like noble and alkali metals. Here we report experimental observation of viscoelastic nonlocalities in the infrared optical response of epsilon-near-zero nanofilms made of low-loss doped cadmium-oxide. The nonlocality is detectable thanks to the low damping rate of conduction electrons and the virtual absence of interband transitions at infrared wavelengths. We describe the motion of conduction electrons u  ...[more]

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