Single-Particle Absorption Spectroscopy by Photothermal Contrast

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dc.citation.firstpage3041en_US
dc.citation.issueNumber5en_US
dc.citation.journalTitleNano Lettersen_US
dc.citation.lastpage3047en_US
dc.citation.volumeNumber15en_US
dc.contributor.authorYorulmaz, Mustafaen_US
dc.contributor.authorNizzero, Saraen_US
dc.contributor.authorHoggard, Annelien_US
dc.contributor.authorWang, Lin-Yungen_US
dc.contributor.authorCai, Yiyuen_US
dc.contributor.authorSu, Man-Nungen_US
dc.contributor.authorChang, Wei-Shunen_US
dc.contributor.authorLink, Stephanen_US
dc.contributor.orgLaboratory for Nanophotonicsen_US
dc.date.accessioned2015-06-24T18:59:27Zen_US
dc.date.available2015-06-24T18:59:27Zen_US
dc.date.issued2015en_US
dc.description.abstractRemoving effects of sample heterogeneity through single-molecule and single-particle techniques has advanced many fields. While background free luminescence and scattering spectroscopy is widely used, recording the absorption spectrum only is rather difficult. Here we present an approach capable of recording pure absorption spectra of individual nanostructures. We demonstrate the implementation of single-particle absorption spectroscopy on strongly scattering plasmonic nanoparticles by combining photothermal microscopy with a supercontinuum laser and an innovative calibration procedure that accounts for chromatic aberrations and wavelength-dependent excitation powers. Comparison of the absorption spectra to the scattering spectra of the same individual gold nanoparticles reveals the blueshift of the absorption spectra, as predicted by Mie theory but previously not detectable in extinction measurements that measure the sum of absorption and scattering. By covering a wavelength range of 300 nm, we are furthermore able to record absorption spectra of single gold nanorods with different aspect ratios. We find that the spectral shift between absorption and scattering for the longitudinal plasmon resonance decreases as a function of nanorod aspect ratio, which is in agreement with simulations.en_US
dc.identifier.citationYorulmaz, Mustafa, Nizzero, Sara, Hoggard, Anneli, et al.. "Single-Particle Absorption Spectroscopy by Photothermal Contrast." <i>Nano Letters,</i> 15, no. 5 (2015) American Chemical Society: 3041-3047. http://dx.doi.org/10.1021/nl504992h.en_US
dc.identifier.doihttp://dx.doi.org/10.1021/nl504992hen_US
dc.identifier.urihttps://hdl.handle.net/1911/80772en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.en_US
dc.subject.keywordsingle-particle spectroscopyen_US
dc.subject.keywordabsorption spectroscopyen_US
dc.subject.keywordphotothermal imagingen_US
dc.subject.keyworddark-field scattering spectroscopyen_US
dc.subject.keywordgold nanoparticleen_US
dc.subject.keywordgold nanoroden_US
dc.subject.keywordsurface plasmonen_US
dc.titleSingle-Particle Absorption Spectroscopy by Photothermal Contrasten_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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