Quantum spill-out in nanometer-thin gold slabs: Effect on plasmon mode index and plasmonic absorption
Optics
2019-05-01 v1
Abstract
A quantum mechanical approach and local response theory are applied to study plasmons propagating in nanometer-thin gold slabs sandwiched between different dielectrics. The metal slab supports two different kinds of modes, classified as long-range and short-range plasmons. Quantum spill-out is found to significantly increase the imaginary part of their mode indices, and, surprisingly, even for slabs wide enough to approach bulk the increase is 20%. This is explained in terms of enhanced plasmonic absorption, which mainly takes place at narrow peaks located near the slab surface.
Keywords
Cite
@article{arxiv.1810.04984,
title = {Quantum spill-out in nanometer-thin gold slabs: Effect on plasmon mode index and plasmonic absorption},
author = {Enok J. H. Skjølstrup and Thomas Søndergaard and Thomas G. Pedersen},
journal= {arXiv preprint arXiv:1810.04984},
year = {2019}
}