Interrogating Nanojunctions Using Ultraconfined Acoustoplasmonic Coupling
Accepted version
Peer-reviewed
Repository URI
Repository DOI
Change log
Authors
Deacon, WM
Lombardi, A
Benz, F
del Valle-Inclan Redondo, Y
Chikkaraddy, Rohit https://orcid.org/0000-0002-3840-4188
Abstract
Single nanoparticles are shown to develop a localized acoustic resonance, the bouncing mode, when placed on a substrate. If both substrate and nanoparticle are noble metals, plasmonic coupling of the nanoparticle to its image charges in the film induces tight light confinement in the nanogap. This yields ultrastrong “acoustoplasmonic” coupling with a figure of merit 7 orders of magnitude higher than conventional acousto-optic modulators. The plasmons thus act as a local vibrational probe of the contact geometry. A simple analytical mechanical model is found to describe the bouncing mode in terms of the nanoscale structure, allowing transient pump-probe spectroscopy to directly measure the contact area for individual nanoparticles.
Description
Keywords
0306 Physical Chemistry (incl. Structural), 1007 Nanotechnology, Nanotechnology, Bioengineering
Journal Title
Physical Review Letters
Conference Name
Journal ISSN
0031-9007
1079-7114
1079-7114
Volume Title
119
Publisher
American Physical Society
Publisher DOI
Sponsorship
European Research Council (320503)
Engineering and Physical Sciences Research Council (EP/L027151/1)
Engineering and Physical Sciences Research Council (EP/G060649/1)
Engineering and Physical Sciences Research Council (EP/K028510/1)
Engineering and Physical Sciences Research Council (EP/H007024/1)
Engineering and Physical Sciences Research Council (EP/L027151/1)
Engineering and Physical Sciences Research Council (EP/G060649/1)
Engineering and Physical Sciences Research Council (EP/K028510/1)
Engineering and Physical Sciences Research Council (EP/H007024/1)
This work is supported by UK EPSRC grants EP/G060649/1, EP/L027151/1 and ERC grant LINASS 320503, as well as the Winton Programme for the Physics of Sustainability (FB, YdV-IR, JM), the Dr Manmohan Singh Scholarship from St John’s College (RC).