Long-range wetting transparency on top of layered metal-dielectric substrates
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Long-range wetting.pdf
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Author(s)
Noginov, M. A.
Barnakov, Yuri A.
Prayakarao, Srujana
Bonner, Carl E.
Narimanov, Evgenii E.
Liberman, Vladimir
Date Issued
June 2016
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Noginov, M. A., Yuri A. Barnakov, Vladimir Liberman, Srujana Prayakarao, Carl E. Bonner, and Evgenii E. Narimanov. “Long-Range Wetting Transparency on Top of Layered Metal-Dielectric Substrates.” Scientific Reports 6 (June 21, 2016): 27834. © 2017 Macmillan Publishers Limited
Version
Final published version
Abstract
It has been recently shown that scores of physical and chemical phenomena (including spontaneous emission, scattering and Förster energy transfer) can be controlled by nonlocal dielectric environments provided by metamaterials with hyperbolic dispersion and simpler metal/dielectric structures. At this time, we have researched van der Waals interactions and experimentally studied wetting of several metallic, dielectric and composite multilayered substrates. We have found that the wetting angle of water on top of MgF2 is highly sensitive to the thickness of the MgF2 layer and the nature of the underlying substrate that could be positioned as far as ~100 nm beneath the water/MgF2 interface. We refer to this phenomenon as long range wetting transparency. The latter effect cannot be described in terms of the most basic model of dispersion van der Waals-London forces based on pair-wise summation of dipole-dipole interactions across an interface or a gap separating the two media. We infer that the experimentally observed gradual change of the wetting angle with increase of the thickness of the MgF2 layer can possibly be explained by the distance dependence of the Hamaker function (describing the strength of interaction), which originates from retardation of electromagnetic waves at the distances comparable to a wavelength.
MIT Department
Lincoln Laboratory
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1038/srep27834
