Trapping plasmonic nanoparticles with MHz electric fields
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Publication Date
2022Journal Title
Applied Physics Letters
ISSN
0003-6951
Publisher
AIP Publishing
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Harlaftis, F., Kos, D., Lin, Q., Lim, K., Dumesnil, C., & Baumberg, J. (2022). Trapping plasmonic nanoparticles with MHz electric fields. Applied Physics Letters https://doi.org/10.1063/5.0091763
Abstract
<jats:p> Dielectrophoresis drives the motion of nanoparticles through the interaction of their induced dipoles with a non-uniform electric field. We experimentally observe rf dielectrophoresis on 100 nm diameter gold nanoparticles in a solution and show that for MHz frequencies, the nanoparticles can reversibly aggregate at electrode gaps. A frequency resonance is observed at which reversible trapping of gold nanoparticle “clouds” occurs in the gap center, producing almost a 1000-fold increase in density. Through accounting for gold cores surrounded by a conducting double layer ion shell, a simple model accounts for this reversibility. This suggests that substantial control over nanoparticle separation is possible, enabling the formation of equilibrium nanoarchitectures in specific locations. </jats:p>
Relationships
Is supplemented by: https://doi.org/10.17863/CAM.84363
Sponsorship
Engineering and Physical Sciences Research Council (EP/L027151/1)
Engineering and Physical Sciences Research Council (EP/P029426/1)
European Commission Horizon 2020 (H2020) Research Infrastructures (RI) (861950)
European Commission Horizon 2020 (H2020) ERC (883703)
Engineering and Physical Sciences Research Council (EP/L015978/1)
Identifiers
External DOI: https://doi.org/10.1063/5.0091763
This record's URL: https://www.repository.cam.ac.uk/handle/1810/336802
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