Plasmon transmission through excitonic subwavelength gaps

Maxim Sukharev, Abraham Nitzan

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We study the transfer of electromagnetic energy across a subwavelength gap separating two co-axial metal nanorods. In the absence of spacer in the gap separating the rods, the system exhibits strong coupling behavior between longitudinal plasmons in the two rods. The nature and magnitude of this coupling are studied by varying various geometrical parameters. As a function of frequency, the transmission is dominated by a split longitudinal plasmon peak. The two hybrid modes are the dipole-like "bonding" mode characterized by a peak intensity in the gap and a quadrupole-like "antibonding" mode whose amplitude vanishes at the gap center. When the length of one rod is varied, this mode spectrum exhibits the familiar anti-crossing behavior that depends on the coupling strength determined by the gap width. When off-resonant 2-level emitters are placed in the gap, almost no effect on the frequency dependent transmission is observed. In contrast, when the molecular system is resonant with the plasmonic line shape, the transmission is strongly modified, showing characteristics of strong exciton-plasmon coupling. Most strongly modified is the transmission near the lower frequency "bonding" plasmon mode. The presence of resonant molecules in the gap affects not only the molecule-field interaction but also the spatial distribution of the field intensity and the electromagnetic energy flux across the junction.

Original languageEnglish (US)
Article number144703
JournalJournal of Chemical Physics
Volume144
Issue number14
DOIs
StatePublished - Apr 14 2016

Fingerprint

Electromagnetic waves
rods
Molecules
Plasmons
Nanorods
Spatial distribution
electromagnetism
Metals
Fluxes
plasmons
spacers
nanorods
line shape
molecules
spatial distribution
emitters
quadrupoles
excitons
dipoles
low frequencies

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Plasmon transmission through excitonic subwavelength gaps. / Sukharev, Maxim; Nitzan, Abraham.

In: Journal of Chemical Physics, Vol. 144, No. 14, 144703, 14.04.2016.

Research output: Contribution to journalArticle

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