Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 13: Plasmonics and nanooptics: Light-matter interaction, spectroscopy I
O 13.2: Vortrag
Montag, 12. März 2018, 15:15–15:30, MA 041
Continuous-Wave Multiphoton Photoemission from Plasmonic Nanostars — •Murat Sivis1, Nicolas Pazos-Perez2, Renwen Yu3, Ramon Alvarez Puebla2,4, F. Javier García de Abajo3,4, and Claus Ropers1 — 14th Physical Institute - Solids and Nanostructures, Georg-August University, Göttingen, Germany — 2Department of Physical Chemistry and EMaS, Universitat Rovira i Virgili,Tarragona, Spain — 3Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Spain — 4Institució Catalana de Reserca i Estudis Avançats, Barcelona, Spain
Highly nonlinear optical photoemission from tailored plasmonic nanostructures, as used in localized electron sources, is typically restricted to ultrafast laser pulse excitation due to the required high local intensities. Here, we demonstrate localized 3-photon photoemission from chemically-synthesized plasmonic gold nanostars under continuous-wave illumination at sub-MWcm−2 incident intensities. Intensity- and polarization-dependent measurements confirm the nonlinear photoemission from the nanostar tips with feature sizes smaller than 5 nm, which facilitate near-field-intensity enhancement factors exceeding 1000. Our results highlight the possibilities for new designs of nanoscale coherent electron sources, with potential applications in microscopy, spectroscopy and sensing.