Universal features of the optical properties of ultrathin plasmonic films

Abstract

We study theoretically confinement related effects in the optical response of thin plasmonic films of controlled variable thickness. While being constant for relatively thick films, the plasma frequency is shown to acquire spatial dispersion typical of two-dimensional materials such as graphene, gradually shifting to the red with the film thickness reduction. The dissipative loss, while decreasing at any fixed frequency, gradually goes up at the plasma frequency as it shifts to the red with the film thickness reduced. These features offer a controllable way to tune spatial dispersion and related optical properties of plasmonic films and metasurfaces on demand, by precisely controlling their thickness, material composition, and by choosing deposition substrates and coating layers appropriately.

5 pages, 4 figures

References in corpus (4)

• Mid-Infrared Plasmonic Biosensing with Graphene
• Subdiffractional focusing and guiding of polaritonic rays in a natural hyperbolic material
• Atomically flat single-crystalline gold nanostructures for plasmonic nanocircuitry
• Colloquium: Graphene spectroscopy

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• Quantum Effects in the Acoustic Plasmons of Atomically-Thin Heterostructures
• Collective Excitations and Optical Response of Ultrathin Carbon Nanotube Films
• Determination of Thickness-dependent Damping Constant and Plasma Frequency for Ultrathin Ag and Au Films: Nanoscale Dielectric Function
• Plasmon thermal conductivity of thin Au and Ag films
• Plasmons in semiconductor and topological insulator wires with large dielectric constant