TY - JOUR
T1 - Quantum spill-out in nanometer-thin gold slabs
T2 - Effect on the plasmon mode index and the plasmonic absorption
AU - Skjølstrup, Enok Johannes Haahr
AU - Søndergaard, Thomas Møller
AU - Pedersen, Thomas Garm
PY - 2019/4/26
Y1 - 2019/4/26
N2 - 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- 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 in narrow regions located near the slab surface.
AB - 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- 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 in narrow regions located near the slab surface.
KW - Nanophotonics
KW - Plasmonics
KW - Surface plasmons
KW - Density functional theory
KW - Electromagnetic wave theory
KW - Transfer matrix method
UR - http://www.scopus.com/inward/record.url?scp=85065232366&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.99.155427
DO - 10.1103/PhysRevB.99.155427
M3 - Journal article
SN - 0163-1829
VL - 99
SP - 1
EP - 9
JO - Physical Review B
JF - Physical Review B
IS - 15
M1 - 155427
ER -