Hot carrier spatio-temporal inhomogeneities in ultrafast nanophotonics

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dc.citation.articleNumber045001
dc.citation.issueNumber4
dc.citation.journalTitleNew Journal of Physics
dc.citation.volumeNumber24
dc.contributor.authorSchirato, Andrea
dc.contributor.authorCrotti, Giulia
dc.contributor.authorZaccaria, Remo Proietti
dc.contributor.authorAlabastri, Alessandro
dc.contributor.authorValle, Giuseppe Della
dc.date.accessioned2022-06-08T15:58:50Z
dc.date.available2022-06-08T15:58:50Z
dc.date.issued2022
dc.description.abstractLight-induced hot carriers in nanostructures and their corresponding optical nonlinearity have been extensively examined during the last decades. However, nonlinear optical effects dictated by the spatio-temporal evolution of out-of-equilibrium electrons at the nanoscale represent a much more recent research focus. Here we theoretically discuss the role of spatial inhomogeneities that energetic electrons feature across individual nanoantennas in metasurface configuration upon illumination with femtosecond laser pulses. As exemplary cases, we consider two-dimensional geometries of gold meta-atoms having either a high aspect ratio or a tapered cross-section and model their ultrafast optical response. A comparison with numerical results obtained either neglecting or accounting for spatial effects indicates that deep sub-wavelength spatio-temporal transients of carriers may have a significant impact on the dynamics of the all-optically modulated signal, with major quantitative corrections up to predicted changes in sign. Our results present hot-electron local inhomogeneities as an emerging subject with potentially relevant applications in various ultrafast nanophotonic configurations.
dc.identifier.citationSchirato, Andrea, Crotti, Giulia, Zaccaria, Remo Proietti, et al.. "Hot carrier spatio-temporal inhomogeneities in ultrafast nanophotonics." <i>New Journal of Physics,</i> 24, no. 4 (2022) IOP Publishing: https://doi.org/10.1088/1367-2630/ac6009.
dc.identifier.digitalSchirato_2022
dc.identifier.doihttps://doi.org/10.1088/1367-2630/ac6009
dc.identifier.urihttps://hdl.handle.net/1911/112450
dc.language.isoeng
dc.publisherIOP Publishing
dc.rightsOriginal content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleHot carrier spatio-temporal inhomogeneities in ultrafast nanophotonics
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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