Size characterisation method and detection enhancement of plasmonic nanoparticles in a pump–probe system

Fuentes-Domínguez, Rafael and Smith, Richard J. and Pérez-Cota, Fernando and Marques, Leonel and Peña-Rodríguez, Ovidio and Clark, Matt (2017) Size characterisation method and detection enhancement of plasmonic nanoparticles in a pump–probe system. Applied Sciences, 7 (8). 819/1-819/12. ISSN 2076-3417

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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.

Item Type: Article
Keywords: plasmonics; metal nanostructures; pulsed lasers
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: 10.3390/app7080819
Depositing User: Eprints, Support
Date Deposited: 14 Aug 2017 13:47
Last Modified: 18 Oct 2017 18:31
URI: http://eprints.nottingham.ac.uk/id/eprint/44889

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