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

de Ceglia, Domenico; Scalora, Michael; Vincenti, Maria A.; Campione, Salvatore; Kelley, Kyle; Runnerstrom, Evan L.; Maria, Jon-Paul; Keeler, Gordon A.; Luk, Ting S.

doi:10.1038/s41598-018-27655-z

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

Journal Article · Tue Jun 19 00:00:00 EDT 2018 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-018-27655-z· OSTI ID:1469653

de Ceglia, Domenico ^[1]; Scalora, Michael ^[2]; Vincenti, Maria A. ^[3]; ^[4]; Kelley, Kyle ^[5]; Runnerstrom, Evan L. ^[5]; Maria, Jon-Paul ^[5]; Keeler, Gordon A. ^[4]; Luk, Ting S. ^[4]

Univ. of Padova (Italy)
US Army AMRDEC, Redstone Arsenal, AL (United STates)
Univ. of Brescia (Italy)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
North Carolina State Univ., Raleigh, NC (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1469653

Report Number(s):: SAND2017--9205J; PII: 27655

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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