title: Plasmonic near-electric field enhancement effects in ultrafast photoelectron emission: correlated spatial and laser polarization microscopy studies of individual Ag nanocubes.
abstract: Electron emission from single, supported Ag nanocubes excited with ultrafast laser pulses (λ = 800 nm) is studied via spatial and polarization correlated (i) dark field scattering microscopy (DFM), (ii) scanning photoionization microscopy (SPIM), and (iii) high-resolution transmission electron microscopy (HRTEM). Laser-induced electron emission is found to peak for laser polarization aligned with cube diagonals, suggesting the critical influence of plasmonic near-field enhancement of the incident electric field on the overall electron yield. For laser pulses with photon energy below the metal work function, coherent multiphoton photoelectron emission (MPPE) is identified as the most probable mechanism responsible for electron emission from Ag nanocubes and likely metal nanoparticles/surfaces in general.
authors: JILA, University of Colorado and National Institute of Standards and Technology, University of Colorado, Boulder, Colorado 80309, United States.
authors: Andrej
authors: A
authors: Grubisic
authors: Emilie
authors: E
authors: Ringe
authors: Claire M
authors: CM
authors: Cobley
authors: Younan
authors: Y
authors: Xia
authors: Laurence D
authors: LD
authors: Marks
authors: Richard P
authors: RP
authors: Van Duyne
authors: David J
authors: DJ
authors: Nesbitt
mesh_terms: D004574:Electromagnetic Fields; D004583:Electrons; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D018613:Microscopy, Confocal / Q000379:methods*; D010316:Particle Size; D017785:Photons; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D012834:Silver