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Active Nanorheology with Plasmonics

Jeong, H-H; Mark, AG; Lee, T-C; Alarcón-Correa, M; Eslami, S; Qiu, T; Gibbs, JG; (2016) Active Nanorheology with Plasmonics. Nano Letters , 16 (8) pp. 4887-4894. 10.1021/acs.nanolett.6b01404. Green open access

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Abstract

Nanoplasmonic systems are valued for their strong optical response and their small size. Most plasmonic sensors and systems to date have been rigid and passive. However, rendering these structures dynamic opens new possibilities for applications. Here we demonstrate that dynamic plasmonic nanoparticles can be used as mechanical sensors to selectively probe the rheological properties of a fluid in situ at the nanoscale and in microscopic volumes. We fabricate chiral magneto-plasmonic nanocolloids that can be actuated by an external magnetic field, which in turn allows for the direct and fast modulation of their distinct optical response. The method is robust and allows nanorheological measurements with a mechanical sensitivity of ∼0.1 cP, even in strongly absorbing fluids with an optical density of up to OD ∼ 3 (∼0.1% light transmittance) and in the presence of scatterers (e.g., 50% v/v red blood cells).

Type: Article
Title: Active Nanorheology with Plasmonics
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.nanolett.6b01404
Publisher version: http://doi.org/10.1021/acs.nanolett.6b01404
Language: English
Additional information: Copyright © 2016 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/ipdf/10.1021/acs.nanolett.6b01404
Keywords: Chiral plasmonics; chiroptical switch; Magneto-plasmonics; nanorheology
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery
URI: https://discovery.ucl.ac.uk/id/eprint/1508313
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