Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 35: Plasmonics III (joint session O/CPP)
CPP 35.2: Vortrag
Mittwoch, 3. April 2019, 10:45–11:00, H8
Investigation of plasmon assisted light emission from heteroepitaxial system of Co islands on Cu(111) by scanning tunneling microscopy — •Vibhuti Rai1, Kevin Edelmann1,2, Lars Wilmes1, Lukas Gerhard1, and Wulf Wulfhekel1,2 — 1Institut für Nanotechnologie, Karlsruher Institut für Technologie, 76344 Eggenstein-Leopoldshafen, Germany — 2Physikalisches Institut, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
Scanning tunneling microscopy (STM) with optical access allows systematic and controlled investigation of light emission from nanometer-sized structures[1]. Here, plasmon mediated light emission from a heteroepitaxial system of bilayer and trilayer Co islands on Cu(111) is studied in ultra-high vacuum at low temperature (4.4 K). Electrical spectroscopy and optical spectroscopy were performed on an image size of 40 x 40 nm where an optical spectrum was taken at every point of a 160 x 160 grid. These measurements show the effect of geometric cavity alteration and the associated resonance shift, influence of dielectric constant of the sample and the tip, and modulation of emission intensity by Friedel oscillation. Interestingly, the results indicate that the difference in the yield of inelastic tunneling dominates over the difference of the gap plasmon resonance.
[1] K. Edelmann et al. Rev. Sci. Instrum. accepted for publication.