Interrogating Nanojunctions Using Ultraconfined Acoustoplasmonic Coupling
de Nijs, Bart
Physical Review Letters
American Physical Society
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Deacon, W., Lombardi, A., Benz, F., Del Valle-Inclan Redondo, Y., Chikkaraddy, R., de Nijs, B., Kleemann, M., et al. (2017). Interrogating Nanojunctions Using Ultraconfined Acoustoplasmonic Coupling. Physical Review Letters, 119 (023901)https://doi.org/10.1103/PhysRevLett.119.023901
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.
Is supplemented by: https://doi.org/10.17863/CAM.10924
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).
European Research Council (320503)
External DOI: https://doi.org/10.1103/PhysRevLett.119.023901
This record's URL: https://www.repository.cam.ac.uk/handle/1810/265252