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    Hot-electron nanoscopy using adiabatic compression of surface plasmons

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    Type
    Article
    Authors
    Giugni, Andrea
    Torre, Bruno
    Toma, Andrea
    Francardi, Marco
    Malerba, Mario
    Alabastri, Alessandro
    Proietti Zaccaria, Remo
    Stockman, Mark Mark
    Di Fabrizio, Enzo M. cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2013-10-20
    Online Publication Date
    2013-10-20
    Print Publication Date
    2013-11
    Permanent link to this record
    http://hdl.handle.net/10754/563045
    
    Metadata
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    Abstract
    Surface plasmon polaritons are a central concept in nanoplasmonics and have been exploited to develop ultrasensitive chemical detection platforms, as well as imaging and spectroscopic techniques at the nanoscale. Surface plasmons can decay to form highly energetic (or hot) electrons in a process that is usually thought to be parasitic for applications, because it limits the lifetime and propagation length of surface plasmons and therefore has an adverse influence on the functionality of nanoplasmonic devices. Recently, however, it has been shown that hot electrons produced by surface plasmon decay can be harnessed to produce useful work in photodetection, catalysis and solar energy conversion. Nevertheless, the surface-plasmon-to-hot-electron conversion efficiency has been below 1% in all cases. Here we show that adiabatic focusing of surface plasmons on a Schottky diode-terminated tapered tip of nanoscale dimensions allows for a plasmon-to-hot-electron conversion efficiency of ∼30%. We further demonstrate that, with such high efficiency, hot electrons can be used for a new nanoscopy technique based on an atomic force microscopy set-up. We show that this hot-electron nanoscopy preserves the chemical sensitivity of the scanned surface and has a spatial resolution below 50 nm, with margins for improvement.
    Citation
    Giugni, A., Torre, B., Toma, A., Francardi, M., Malerba, M., Alabastri, A., … Di Fabrizio, E. (2013). Hot-electron nanoscopy using adiabatic compression of surface plasmons. Nature Nanotechnology, 8(11), 845–852. doi:10.1038/nnano.2013.207
    Sponsors
    The authors thank M. Lorenzoni for providing the patterned sample for hot-electron nanoimaging. The authors also thank S. Lupi for infrared absorption measurements, B. S. Ooi for helping with 980 nm measurements, and A. Fratalocchi for several useful discussions. E. D. F. acknowledges support from European Projects Nanoantenna (FP7 No. 241818, FOCUS FP7 No. 270483). M. I. S. acknowledges support from the Max Planck Society and the Deutsche Forschungsgemeinschaft Cluster of Excellence: Munich Center for Advanced Photonics (http://www.munich-photonics.de) and the Chemical Sciences, Biosciences and Geosciences Division (grant no. DE-FG02-01ER15213) of the Materials Sciences and Engineering Division of the Office of Basic Energy Sciences, Office of Science, US Department of Energy (grant no. DE-FG02-11ER46789).
    Publisher
    Springer Nature
    Journal
    Nature Nanotechnology
    DOI
    10.1038/nnano.2013.207
    PubMed ID
    24141538
    ae974a485f413a2113503eed53cd6c53
    10.1038/nnano.2013.207
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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