Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 11: Ultrafast and Nonlinear Plasmonics
O 11.4: Vortrag
Montag, 16. März 2015, 15:45–16:00, MA 004
Short-range surface plasmonics on atomically flat thin single gold nanocrystals: Electron emission from a 60 nm spot at 800 nm wavelength — •Bettina Frank1, Philip Kahl2, Thomas Weiss1, Liwei Fu3, Michael Horn von Hoegen2, Frank Meyer zu Heringdorf2, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 2Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany — 3Institute of Applied Optics, University of Stuttgart, Germany
We observe short-range surface plasmons in atomically flat single gold nanocrystals with a thickness in the 20-40 nm range. The crystals are grown electrochemically on atomically flat silicon wafers and structured with FIB-milled patterns on the surface. Sub-20 fs laser pulses at 800 nm in normal incidence geometry excite long-range as well as short-range surface plasmons. The latter ones possess plasmon wavelengths in the 140-180 nm range and exhibit considerably reduced propagation velocity. Using PEEM we can image these plasmons, statically as well as in a time-resolved fashion. Using circular grating patterns, nanofocusing down to 60 nm is experimentally observed.
This work was supported by DFG (SPP1391), BMBF, BW Stiftung, and ERC.