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2015 ; 15
(9
): 6267-75
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Wedge Waveguides and Resonators for Quantum Plasmonics
#MMPMID26284499
Kress SJ
; Antolinez FV
; Richner P
; Jayanti SV
; Kim DK
; Prins F
; Riedinger A
; Fischer MP
; Meyer S
; McPeak KM
; Poulikakos D
; Norris DJ
Nano Lett
2015[Sep]; 15
(9
): 6267-75
PMID26284499
show ga
Plasmonic structures can provide deep-subwavelength electromagnetic fields that
are useful for enhancing light-matter interactions. However, because these
localized modes are also dissipative, structures that offer the best compromise
between field confinement and loss have been sought. Metallic wedge waveguides
were initially identified as an ideal candidate but have been largely abandoned
because to date their experimental performance has been limited. We combine
state-of-the-art metallic wedges with integrated reflectors and precisely placed
colloidal quantum dots (down to the single-emitter level) and demonstrate
quantum-plasmonic waveguides and resonators with performance approaching
theoretical limits. By exploiting a nearly 10-fold improvement in wedge-plasmon
propagation (19 ?m at a vacuum wavelength, ?vac, of 630 nm), efficient reflectors
(93%), and effective coupling (estimated to be >70%) to highly emissive (~90%)
quantum dots, we obtain Ag plasmonic resonators at visible wavelengths with
quality factors approaching 200 (3.3 nm line widths). As our structures offer
modal volumes down to ~0.004?vac(3) in an exposed single-mode waveguide-resonator
geometry, they provide advantages over both traditional photonic microcavities
and localized-plasmonic resonators for enhancing light-matter interactions. Our
results confirm the promise of wedges for creating plasmonic devices and for
studying coherent quantum-plasmonic effects such as long-distance
plasmon-mediated entanglement and strong plasmon-matter coupling.