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Asymptotics of surface-plasmon redshift saturation at subnanometric separations

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Title: Asymptotics of surface-plasmon redshift saturation at subnanometric separations
Authors: Schnitzer, O
Giannini, V
Craster, RV
Maier, SA
Item Type: Journal Article
Abstract: Many promising nanophotonics endeavors hinge upon the unique plasmonic properties of nanometallic structures with narrow nonmetallic gaps, which support superconcentrated bonding modes that singularly redshift with decreasing separations. In this Rapid Communication, we present a descriptive physical picture, complemented by elementary asymptotic formulas, of a nonlocal mechanism for plasmon redshift saturation at subnanometric gap widths. Thus, by considering the electron-charge and field distributions in the close vicinity of the metal-vacuum interface, we show that nonlocality is asymptotically manifested as an effective potential discontinuity. For bonding modes in the near-contact limit, the latter discontinuity is shown to be effectively equivalent to a widening of the gap. As a consequence, the resonance-frequency near-contact asymptotics are a renormalization of the corresponding local ones. Specifically, the renormalization furnishes an asymptotic plasmon-frequency lower bound that scales with the 1/4 power of the Fermi wavelength. We demonstrate these remarkable features in the prototypical cases of nanowire and nanosphere dimers, showing agreement between our elementary expressions and previously reported numerical computations.
Issue Date: 15-Jan-2016
Date of Acceptance: 29-Dec-2015
URI: http://hdl.handle.net/10044/1/28836
DOI: 10.1103/PhysRevB.93.041409
ISSN: 2469-9950
Publisher: American Physical Society
Journal / Book Title: Physical Review B
Volume: 93
Issue: 4
Copyright Statement: © 2016 The American Physical Society
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
The Leverhulme Trust
The Royal Society
Funder's Grant Number: EP/L024926/1
F/07 058/BK
WM110079
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Materials Science
Physics
OPTICAL-RESPONSE
QUANTUM
ENHANCEMENT
FIELD
NANOSTRUCTURES
NONLOCALITY
NANOSCALE
RESONANCE
MODES
physics.optics
physics.optics
cond-mat.mes-hall
Publication Status: Published
Article Number: 041409(R)
Online Publication Date: 2016-01-13
Appears in Collections:Condensed Matter Theory
Physics
Mathematics
Experimental Solid State
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences