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2016 ; 2
(3
): e1501574
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Single-plasmon interferences
#MMPMID26998521
Dheur MC
; Devaux E
; Ebbesen TW
; Baron A
; Rodier JC
; Hugonin JP
; Lalanne P
; Greffet JJ
; Messin G
; Marquier F
Sci Adv
2016[Mar]; 2
(3
): e1501574
PMID26998521
show ga
Surface plasmon polaritons are electromagnetic waves coupled to collective
electron oscillations propagating along metal-dielectric interfaces, exhibiting a
bosonic character. Recent experiments involving surface plasmons guided by wires
or stripes allowed the reproduction of quantum optics effects, such as
antibunching with a single surface plasmon state, coalescence with a two-plasmon
state, conservation of squeezing, or entanglement through plasmonic channels. We
report the first direct demonstration of the wave-particle duality for a single
surface plasmon freely propagating along a planar metal-air interface. We develop
a platform that enables two complementary experiments, one revealing the particle
behavior of the single-plasmon state through antibunching, and the other one
where the interferences prove its wave nature. This result opens up new ways to
exploit quantum conversion effects between different bosonic species as shown
here with photons and polaritons.