Abstract: We propose ultrathin plasmonic nanocoatings that can absorb more than 90% of visible light in a broad (exceeding 100 nm) wavelength range, reaching almost total absorption at the surface plasmon resonance (SPR) wavelength. Such a coating contains only two monolayers of metal nanoparticles (with smaller nanoparticles in the first monolayer and larger nanoparticles in the second monolayer) separated by a dielectric film with quarter-wave thickness. We analytically derive spectral characteristics of two-monolayer systems and explore the regimes, which must be satisfied for realization of high-absorptive coatings at the SPR range.

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