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. 2021 Mar 17;10:59. doi: 10.1038/s41377-021-00474-0

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© The Author(s) 2021

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Fig. 1 — a Surface plasmon polariton excitation at a dielectric–metal interface. b Dispersion relationship curves of light in free space, light in a dielectric and surface plasmon plaritons. Here, ω_P is the frequency of bulk longitudinal electron excitations, i.e., the plasma frequency