Quantum resonances of Landau damping in the electromagnetic response of metallic nanoslabs

Optics Letters
S G Castillo-LópezF Pérez-Rodríguez

Abstract

The resonant quantization of Landau damping in far-infrared absorption spectra of metal nano-thin films is predicted within the Kubo formalism. Specifically, it is found that the discretization of the electromagnetic and electron wave numbers inside a metal nanoslab produces quantum nonlocal resonances well-resolved at slab thicknesses smaller than the electromagnetic skin depth. Landau damping manifests itself precisely as such resonances, tracing the spectral curve obtained within the semiclassical Boltzmann approach. For slab thicknesses much greater than the skin depth, the classical regime emerges. Here the results of the quantum model and the Boltzmann approach coincide. Our analytical study is in perfect agreement with corresponding numerical simulations.

References

Apr 11, 2014·Optics Express·Alejandro Paredes-JuárezFelipe Pérez-Rodríguez
May 3, 2014·Nature Communications·N A MortensenS I Bozhevolnyi
Apr 22, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Søren RazaN Asger Mortensen
Aug 11, 2015·Optics Letters·A Paredes-JuárezF Pérez-Rodríguez

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