ArticleScientific reports2018
Viscoelastic optical nonlocality of low-loss epsilon-near-zero nanofilms.
Article in Scientific reports, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Second-Harmonic Generation Enhancement in Polar Dielectric Films via Nonlocal Longitudinal Modes and Berreman Modes.Nanophotonics (Berlin, Germany) · 2026Article
- Third Harmonic Generation in Transparent Longitudinal Epsilon-Near-Zero Multilayers.Nanophotonics (Berlin, Germany) · 2026Article
- Control and enhancement of optical nonlinearities in plasmonic semiconductor nanostructures.Light, science & applications · 2025Article
- Low-Power Threshold Optical Bistability Enabled by Hydrodynamic Kerr Nonlinearity of Free Carriers in Heavily Doped Semiconductors.ACS photonics · 2024Article
- Field enhancement of epsilon-near-zero modes in realistic ultrathin absorbing films.Nanophotonics (Berlin, Germany) · 2023Article
- Strongly Coupled Plasmon Polaritons in Gold and Epsilon-Near-Zero Bifilms.ACS photonics · 2023Article
- All-optical switching in epsilon-near-zero asymmetric directional coupler.Scientific reports · 2022Article
- Modeling and observation of mid-infrared nonlocality in effective epsilon-near-zero ultranarrow coaxial apertures.Nature communications · 2019Article
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Authors and funding
9 authors.
Funding
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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.
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