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.
- Authors:
-
[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)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1469653
- Report Number(s):
- SAND2017-9205J
Journal ID: ISSN 2045-2322; PII: 27655
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
de Ceglia, Domenico, Scalora, Michael, Vincenti, Maria A., Campione, Salvatore, Kelley, Kyle, Runnerstrom, Evan L., Maria, Jon-Paul, Keeler, Gordon A., and Luk, Ting S. Viscoelastic optical nonlocality of low-loss epsilon-near-zero nanofilms. United States: N. p., 2018.
Web. doi:10.1038/s41598-018-27655-z.
de Ceglia, Domenico, Scalora, Michael, Vincenti, Maria A., Campione, Salvatore, Kelley, Kyle, Runnerstrom, Evan L., Maria, Jon-Paul, Keeler, Gordon A., & Luk, Ting S. Viscoelastic optical nonlocality of low-loss epsilon-near-zero nanofilms. United States. https://doi.org/10.1038/s41598-018-27655-z
de Ceglia, Domenico, Scalora, Michael, Vincenti, Maria A., Campione, Salvatore, Kelley, Kyle, Runnerstrom, Evan L., Maria, Jon-Paul, Keeler, Gordon A., and Luk, Ting S. Tue .
"Viscoelastic optical nonlocality of low-loss epsilon-near-zero nanofilms". United States. https://doi.org/10.1038/s41598-018-27655-z. https://www.osti.gov/servlets/purl/1469653.
@article{osti_1469653,
title = {Viscoelastic optical nonlocality of low-loss epsilon-near-zero nanofilms},
author = {de Ceglia, Domenico and Scalora, Michael and Vincenti, Maria A. and Campione, Salvatore and Kelley, Kyle and Runnerstrom, Evan L. and Maria, Jon-Paul and Keeler, Gordon A. and Luk, Ting S.},
abstractNote = {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.},
doi = {10.1038/s41598-018-27655-z},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {Tue Jun 19 00:00:00 EDT 2018},
month = {Tue Jun 19 00:00:00 EDT 2018}
}
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