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dc.contributor.authorConteduca, Donato
dc.contributor.authorKhan, Saba N.
dc.contributor.authorRuiz, Manuel A. Martínez
dc.contributor.authorBruce, Graham D.
dc.contributor.authorKrauss, Thomas F.
dc.contributor.authorDholakia, Kishan
dc.identifier.citationConteduca , D , Khan , S N , Ruiz , M A M , Bruce , G D , Krauss , T F & Dholakia , K 2023 , ' Fano resonance-assisted all-dielectric array for enhanced near-field optical trapping of nanoparticles ' , ACS Photonics , vol. Articles ASAP .
dc.identifier.otherRIS: urn:4B0BEE56B8C307EBF22521F52B0FB1C7
dc.identifier.otherORCID: /0000-0003-3403-0614/work/146960629
dc.descriptionFunding: This work was supported by the UK Engineering and Physical Sciences Research Council (EP/P030017/1), and the Australian Research Council (grant DP220102303).en
dc.description.abstractNear-field optics can overcome the diffraction limit by creating strong optical gradients to enable the trapping of nanoparticles. However, it remains challenging to achieve efficient, stable trapping without heating and thermal effects. Dielectric structures have been used to address this issue but usually offer weak trap stiffness. In this work, we exploit the Fano resonance effect in an all-dielectric quadrupole nanostructure to realize a 20-fold enhancement of trap stiffness, compared to the off-resonance case. This enables a high effective trap stiffness of 1.19 fN/nm for 100 nm diameter polystyrene nanoparticles with 4.2 mW/μm2 illumination. Furthermore, we demonstrate the capability of the structure to simultaneously trap two particles at distinct locations within the nanostructure array.
dc.relation.ispartofACS Photonicsen
dc.subjectOptical trappingen
dc.subjectFano resonance effecten
dc.subjectNear-field enhancementen
dc.subjectDielectric nanostructureen
dc.subjectPolystyrene nanoparticlesen
dc.subjectQC Physicsen
dc.titleFano resonance-assisted all-dielectric array for enhanced near-field optical trapping of nanoparticlesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Centre for Biophotonicsen
dc.contributor.institutionUniversity of St Andrews. Sir James Mackenzie Institute for Early Diagnosisen
dc.contributor.institutionUniversity of St Andrews. Institute of Behavioural and Neural Sciencesen
dc.contributor.institutionUniversity of St Andrews. Biomedical Sciences Research Complexen
dc.description.statusPeer revieweden

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