Wide-field imaging of single nanoparticle extinction with sub-nm2 sensitivity

Payne, Lukas, Langbein, Wolfgang ORCID: https://orcid.org/0000-0001-9786-1023 and Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314 2018. Wide-field imaging of single nanoparticle extinction with sub-nm2 sensitivity. Physical Review Applied 9 , 034006. 10.1103/PhysRevApplied.9.034006

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Abstract

We report a highly sensitive wide-�eld imaging technique for quantitative measurement of the optical extinction cross-section �ext of single nanoparticles. The technique is simple and high-speed, and enables simultaneous acquisition of hundreds of nanoparticles for statistical analysis. Using rapid referencing, fast acquisition, and a deconvolution analysis, a shot-noise limited sensitivity down to 0.4nm2 is achieved. Measurements on a set of individual gold nanoparticles of 5nm diameter using this method yield �ext = (10:0 � 3:1)nm2, consistent with theoretical expectations, and well above the background uctuations of 0.9nm2.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences Physics and Astronomy
Publisher:	American Physical Society
ISSN:	2331-7019
Date of First Compliant Deposit:	8 January 2018
Date of Acceptance:	29 December 2017
Last Modified:	04 Dec 2024 11:00
URI:	https://orca.cardiff.ac.uk/id/eprint/107960

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