Circular Differential Scattering of Single Chiral Self-Assembled Gold Nanorod Dimers

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dc.citation.firstpage1602en_US
dc.citation.issueNumber11en_US
dc.citation.journalTitleACS Photonicsen_US
dc.citation.lastpage1610en_US
dc.citation.volumeNumber2en_US
dc.contributor.authorWang, Lin-Yungen_US
dc.contributor.authorSmith, Kyle W.en_US
dc.contributor.authorDominiquez-Medina, Sergioen_US
dc.contributor.authorMoody, Nicoleen_US
dc.contributor.authorOlson, Jana M.en_US
dc.contributor.authorZhang, Huananen_US
dc.contributor.authorChang, Wei-Shunen_US
dc.contributor.authorKotov, Nicholasen_US
dc.contributor.authorLink, Stephanen_US
dc.contributor.orgLaboratory for Nanophotonicsen_US
dc.date.accessioned2016-01-28T17:15:40Zen_US
dc.date.available2016-01-28T17:15:40Zen_US
dc.date.issued2015en_US
dc.description.abstractCircular dichroism spectroscopy is essential for structural characterization of proteins and chiral nanomaterials. Chiral structures from plasmonic materials have extraordinary strong circular dichroism effects compared to their molecular counterparts. While being extensively investigated, the comprehensive account of circular dichroism effects consistent with other plasmonic phenomena is still missing. Here we investigated the circular differential scattering of a simple chiral plasmonic system, a twisted side-by-side Au nanorod dimer, using single-particle circular dichroism spectroscopy complimented with electromagnetic simulations. This approach enabled us to quantify the effects of structural symmetry breaking, namely, size-mismatch between the constituent Au nanorods and large twist angles on the resulting circular differential scattering spectrum. Our results demonstrate that, if only scattering is considered as measured by dark-field spectroscopy, a homodimer of Au nanorods with similar sizes produces a circular differential scattering line shape that is different from the bisignate response of the corresponding conventional CD spectrum, which measures extinction, that is, the sum of scattering and absorption. On the other hand, symmetry breaking in a heterodimer with Au nanorods with different sizes yields a bisignate circular differential scattering line shape. In addition, we provide a general method for correcting linear dichroism artifacts arising from slightly elliptically polarized light in a typical dark-field microscope, as is necessary especially when measuring highly anisotropic nanostructures, such as side-by-side nanorods. This work lays the foundation for understanding absorption and scattering contributions to the CD line shape of single chiroplasmonic nanostructures free from ensemble-averaging, especially important for self-assembled chiral nanostructures that usually exist as both enantiomers.en_US
dc.identifier.citationWang, Lin-Yung, Smith, Kyle W., Dominiquez-Medina, Sergio, et al.. "Circular Differential Scattering of Single Chiral Self-Assembled Gold Nanorod Dimers." <i>ACS Photonics,</i> 2, no. 11 (2015) American Chemical Society: 1602-1610. http://dx.doi.org/10.1021/acsphotonics.5b00395.en_US
dc.identifier.doihttp://dx.doi.org/10.1021/acsphotonics.5b00395en_US
dc.identifier.urihttps://hdl.handle.net/1911/88217en_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.keywordchiralityen_US
dc.subject.keywordnanoparticleen_US
dc.subject.keywordsurface plasmonen_US
dc.subject.keywordself-assemblyen_US
dc.subject.keywordsingle-particle spectroscopyen_US
dc.titleCircular Differential Scattering of Single Chiral Self-Assembled Gold Nanorod Dimersen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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