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Appl. Sci. 2017, 7(8), 819; doi:10.3390/app7080819

Size Characterisation Method and Detection Enhancement of Plasmonic Nanoparticles in a Pump–Probe System

1
Optics and Photonics Group, University of Nottingham, University Park, Nottingham NG7 2RD, UK
2
Instituto de Fusión Nuclear, Universidad Politécnica de Madrid, C/ José Gutiérrez Abascal 2, E-28006 Madrid, Spain
*
Author to whom correspondence should be addressed.
Received: 5 July 2017 / Revised: 3 August 2017 / Accepted: 7 August 2017 / Published: 10 August 2017
(This article belongs to the Special Issue Laser Interaction with Plasmonic Nanostructures)
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Abstract

The optical resonance of metal nanoparticles can be used to enhance the generation and detection of their main vibrational mode. In this work, we show that this method allows the accurate characterisation of the particle’s size because the vibrational frequency of plasmonic nanoparticles only depends on their mechanical properties. Moreover, by a careful selection of the particle size and/or probe laser wavelength, the detected signal can be increased by a large factor (∼9 for the particles used in this work) under the same illumination conditions. Finally, we show experimentally that particles of different sizes inside the point spread function can be observed due to the differences in their vibrational states, which could provide a feasible route to super-resolution. View Full-Text
Keywords: plasmonics; metal nanostructures; pulsed lasers plasmonics; metal nanostructures; pulsed lasers
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Fuentes-Domínguez, R.; Smith, R.J.; Pérez-Cota, F.; Marques, L.; Peña-Rodríguez, O.; Clark, M. Size Characterisation Method and Detection Enhancement of Plasmonic Nanoparticles in a Pump–Probe System. Appl. Sci. 2017, 7, 819.

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