Optical micro-spectroscopy of single metallic nanoparticles: quantitative extinction and transient resonant four-wave mixing

Payne, Lukas, Zoriniants, George, Masia, Francesco ORCID: https://orcid.org/0000-0003-4958-410X, Arkill, Kenton P., Verkade, Paul, Rowles, Darren, Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 and Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314 2015. Optical micro-spectroscopy of single metallic nanoparticles: quantitative extinction and transient resonant four-wave mixing. Faraday Discussions 184 , pp. 305-320. 10.1039/C5FD00079C

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Abstract

We report a wide-field imaging method to rapidly and quantitatively measure the optical extinction cross-section σext (also polarisation resolved) of a large number of individual gold nanoparticles, for statistically-relevant single particle analysis. We demonstrate a sensitivity of 5 nm2 in σext, enabling detection of single 5 nm gold nanoparticles with total acquisition times in the 1 min range. Moreover, we have developed an analytical model of the polarisation resolved σext, which enabled us to extract geometrical particle aspect ratios from the measured σext. Using this method, we have characterized a large number of nominally-spherical gold nanoparticles in the 10–100 nm size range. Furthermore, the method provided measurements of in-house fabricated nanoparticle conjugates, allowing distinction of individual dimers from single particles and larger aggregates. The same particle conjugates were investigated correlatively by phase-resolved transient resonant four-wave mixing micro-spectroscopy. A direct comparison of the phase-resolved response between single gold nanoparticles and dimers highlighted the promise of the four-wave mixing technique for sensing applications with dimers as plasmon rulers.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Biosciences Physics and Astronomy
Subjects:	Q Science > QD Chemistry Q Science > QH Natural history > QH301 Biology
Additional Information:	This article is part of themed collection: Single-Molecule Microscopy and Spectroscopy
Publisher:	Royal Society of Chemistry
ISSN:	1359-6640
Funders:	EPSRC
Date of First Compliant Deposit:	30 March 2016
Date of Acceptance:	14 May 2015
Last Modified:	05 May 2023 11:23
URI:	https://orca.cardiff.ac.uk/id/eprint/84353

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