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dc.contributor.authorTumkur, Thejaswi U.
Yang, Xiao
Cerjan, Benjamin
Halas, Naomi J.
Nordlander, Peter
Thomann, Isabell
dc.date.accessioned 2016-11-22T15:16:06Z
dc.date.available 2016-11-22T15:16:06Z
dc.date.issued 2016
dc.identifier.citation Tumkur, Thejaswi U., Yang, Xiao, Cerjan, Benjamin, et al.. "Photoinduced force mapping of plasmonic nanostructures." Nano Letters, (2016) American Chemical Society: http://dx.doi.org/10.1021/acs.nanolett.6b04245.
dc.identifier.urihttps://hdl.handle.net/1911/92710
dc.descriptionNEWS COVERAGE: A news release based on this journal publication is available online: http://news.rice.edu/2016/12/14/light-provides-pull-for-future-nanocatalyst-measurement/
dc.description.abstract The ability to image the optical near-fields of nanoscale structures, map their morphology and concurrently obtain spectroscopic information, all with high spatiotemporal resolution, is a highly sought-after technique in nanophotonics. As a step towards this goal, we demonstrate the mapping of electromagnetic forces between a nanoscale tip and an optically excited sample consisting of plasmonic nanostructures, with an imaging platform based on atomic force microscopy. We present the first detailed joint experimental-theoretical study of this type of photo-induced force microscopy. We show that the enhancement of near-field optical forces in gold disk dimers and nanorods follows the expected plasmonic field enhancements, with strong polarization sensitivity. We then introduce a new way to evaluate optically-induced tip-sample forces by simulating realistic geometries of the tip and sample. We decompose the calculated forces into in-plane and out-of-plane components and compare the calculated and measured force enhancements in the fabricated plasmonic structures. Finally, we show the usefulness of photo-induced force mapping for characterizing the heterogeneity of near-field enhancements in precisely e-beam fabricated nominally alike nanostructures - a capability of widespread interest for precise nanomanufacturing, SERS and photocatalysis applications.
dc.language.iso eng
dc.publisher American Chemical Society
dc.rights This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.
dc.title Photoinduced force mapping of plasmonic nanostructures
dc.type Journal article
dc.citation.journalTitle Nano Letters
dc.contributor.org Laboratory for Nanophotonics
dc.contributor.org Rice Quantum Institute
dc.subject.keywordplasmonics
near-field scanning optical microscopy
gradient force
photocatalysis
nanocharacterization
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1021/acs.nanolett.6b04245
dc.type.publication post-print


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