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Title: 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:
 [1];  [2];  [3]; ORCiD logo [4];  [5];  [5];  [5];  [4];  [4]
  1. Univ. of Padova (Italy)
  2. US Army AMRDEC, Redstone Arsenal, AL (United STates)
  3. Univ. of Brescia (Italy)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. 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. 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., and Luk, Ting S. Tue . "Viscoelastic optical nonlocality of low-loss epsilon-near-zero nanofilms". United States. doi: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 = {2018},
month = {6}
}

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    Works referencing / citing this record:

    Nonlinear optical effects in epsilon-near-zero media
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