Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 50: Plasmonics & Nanooptics III: STM and Time-Resolved Methods (joint session O/CPP)

O 50.8: Vortrag

Mittwoch, 3. April 2019, 12:15–12:30, H8

Quantum Pathway Interference between Surface Plasmon Polariton and Photon — •David Janoschka, Pascal Dreher, Michael Horn- von Hoegen, and Frank J. Meyer zu Heringdorf — Faculty of Physics and CENIDE, University of Duisburg-Essen, Duisburg, Germany

It is well known that the coherent superposition of light and surface plasmon polaritons (SPPs) at a surface leads to an interferometric mixture of both their electromagnetic fields. At metal surfaces, electrons can be liberated from this mixture by a nonlinear electron emission pathway. In pump probe experiments, the time dependence of the fields has been used to image the propagation of SPPs in a photoemission electron microscope (PEEM). Strictly speaking, the contrast in the microscope arises from the absorption of either photons, SPPs, or both. Here we use Fourier techniques to disentangle the different contributions of photons and SPPs to the electron emission. In addition to the individual contributions of photons and SPPs we find emission pathways that can only be explained by a quantum interference of SPP and photon.