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Séminaire de Christoph GROSSE (21 février 2017)
NanoPhotonics Centre, Cavendish Laboratory, Dept. of Physics, University of Cambridge, UK
by - 27 January 2017 (modifié le 31 January 2017)
Light generation at scales below one billionth of a metre and one billionth of a second
In the first part, I will discuss the nanoscale electroluminescence from C60 multilayer films. It turns out that the radiative recombination of electron–hole pairs is restricted to individual structural defects, at which the parity-forbidden lowest singlet transitions becomes locally allowed. Measurement of the photon statistics enables accessing the exciton lifetime and proves the single-photon emission of these defects. The local charge carrier dynamics can be extracted from the luminescence response to nanosecond voltage pulses. In the second part, I will focus on the excitation of tip-induced plasmons, which are collective oscillations of free electrons in the metal tip and substrate. I will demonstrate that the orbitals of a single-molecule act as energetically and submolecularly defined gates for the generation of plasmons in tunnel junctions. By this means, it becomes possible to modulate the plasmon generation over several orders of magnitude and well in the gigahertz frequency range.
Séminaire de Christoph GROSSE - 339.1 KiB 21 février 2017 |