Reference : Magnetic control of particle trapping in a hybrid plasmonic nanopore
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/46840
Magnetic control of particle trapping in a hybrid plasmonic nanopore
English
Maccaferri, Nicolò mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Vavassori, Paolo []
Garoli, Denis []
2021
Applied Physics Letters
American Institute of Physics
118
193102
Yes
International
0003-6951
1077-3118
Melville
NY
[en] Plasmonic nanopores are extensively investigated as single molecules detectors. The main limitations in plasmonic nanopore technology are the too fast translocation velocity of the molecule through the pore and the consequent very short analysis times, as well as the possible instabilities due to local heating. An interesting approach to enable longer acquisition times is represented by the ability to stably trap the nanoparticles used to tag molecules close to the nanopore. Here, we theoretically investigate the performance of a magneto-plasmonic nanopore prepared with a thin layer of cobalt sandwiched between two gold layers. A nanopore is then coupled with a bifunctional (magnetic and plasmonic) core–shell nanoparticle made of magnetite (core) covered with a thin layer of gold (shell). By setting the magnetic configuration of the cobalt layer around the pore by an external magnetic field, it is possible to generate a nanoscale magnetic tweezer to trap the nanoparticle at a specific point. Considering a ∼10 nm diameter magnetite nanoparticle, we calculate a trapping force up to 28 pN, an order of magnitude above the force that can be obtained with standard optical or plasmonic trapping approaches. Moreover, the magnetic force pulls the nanoparticle in close contact with the plasmonic nanopore's wall, thus enabling the formation of a nanocavity enclosing a sub-10 nm3 confined electromagnetic field with an average field intensity enhancement up to 230 at near-infrared wavelengths. The presented hybrid magneto-plasmonic system points toward a strategy to improve nanopore-based biosensors for single-molecule detection and potentially for the analysis of various biomolecules.
Fonds National de la Recherche - FnR
ULTRON
http://hdl.handle.net/10993/46840
10.1063/5.0046245
https://aip.scitation.org/doi/full/10.1063/5.0046245
FnR ; FNR13624497 > Nicolò Maccaferri > ULTRON > Ultrafast Coherent Hybridization Of Photons And Spins In Multi-functional Magnetoplasmonic Metamaterials > 01/01/2020 > 31/12/2022 > 2019

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