Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 97: Scanning probe techniques: Method development II
O 97.7: Talk
Thursday, March 15, 2018, 16:45–17:00, MA 005
Low temperature scanning tunneling microscope with optical access — •Lars Wilmes2, Kevin Edelmann1,2, Moritz Winkler2, Lukas Gerhard2, and Wulf Wulfhekel1,2 — 1Physikalisches Institut, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — 2Institut für Nanotechnologie, Karlsruher Institut für Technologie, 76344 Eggenstein-Leopoldshafen, Germany
Exploring the conversion of electric power to light and the relevant processes at a molecular level is key for the further development and miniaturization of high efficient light emitting devices. Systematic investigations with a reduced number of degrees of freedom can be achieved in single molecule junctions in a scanning tunneling microscope (STM). A new ultra high vacuum low temperature (1.5 K) STM featuring an optical access with high collection efficiency gives experimental access to plasmons within the tunnel junction and electroluminescence from single molecules. A silver coated tip within a microscopic parabolic mirror is used to focus light directly into an optical fiber. With a single fiber to guide the collected light into a spectrometer the STM provides a combination of optical and electrical spectroscopy. Preliminary results show promising photon yield with atomic-scale spatial resolution.