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    3D-Printed Photocathodes for Resonant, Terahertz-Field-Driven Ultrafast Electron Emission

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    Type
    Preprint
    Authors
    Rovere, Andrea
    Piccoli, Riccardo
    Bertoncini, Andrea cc
    Jeong, Young-Gyun
    Payeur, Stéphane
    Vidal, François
    Lee, Seung-Heon
    Seok, Jin-Hong
    Kwon, O-Pil
    Morandotti, Roberto
    Liberale, Carlo cc
    Razzari, Luca
    KAUST Department
    Bioscience Program
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2020-10-22
    Permanent link to this record
    http://hdl.handle.net/10754/666243
    
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    Abstract
    Ultrashort photoemitted electron bunches can provide high electron currents within sub-picosecond timeframes, enabling time-resolved investigations of ultrafast physical processes with nanoscale resolution. Non-resonant conductive nanotips are typically employed to realize nanoscale photoelectron sources with high brightness. However, such emitters require complex non-scalable fabrication procedures featuring poor reproducibility. Planar resonant antennas fabricated via photolithography have been recently investigated, also because of their superior field enhancement properties. Nevertheless, the electron emission from these structures is parallel to the substrate plane, which limits their practical use as electron sources. In this work, we present an innovative out-of-plane, resonant nanoantenna design for field-driven photoemission enabled by high-resolution 3D printing. Numerical and experimental evidences demonstrate that gold-coated, terahertz resonant nanocones provide large local electric fields at their apex, automatically ensuring out-of-plane coherent electron emission and acceleration. We show that the resonant structures can be conveniently arranged in an array form, for a further significant electron extraction enhancement via a collective terahertz response. Remarkably, such collective behaviour can also be harvested to boost photoemission from an individual nano-source. Our approach opens the path for a new generation of photocathodes that can be reproducibly fabricated and designed at will, significantly relaxing the requirement for intense terahertz drivers.
    Publisher
    arXiv
    arXiv
    2010.12098
    Additional Links
    https://arxiv.org/pdf/2010.12098
    Collections
    Biological and Environmental Sciences and Engineering (BESE) Division; Preprints; Bioscience Program

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