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Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 71: Scanning Probe Techniques and New Experimental Methods

O 71.2: Poster

Wednesday, March 9, 2016, 18:15–20:30, Poster A

Design of a low-temperature scanning tunneling microscope with photon collection system — •Moritz Winkler1, Lukas Gerhard1, Kevin Edelmann2, and Wulf Wulfhekel21Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT) — 2Physikalisches Institut, Karlsruhe Institute of Technology (KIT)

We provide a new design for a low-temperature ultra-high vacuum scanning tunneling microscope (STM) with a photon collection unit that guides the collected light into a spectrometer. The design has the potential of achieving a high photon yield by using a 3D-printed miniature parabolic mirror that collects photons from a large solid angle close to the tunnel junction. The photon yield is further increased by limiting the optical path to a single optical fiber. The STM will be equipped with an absolute position determination system of the tip in order to approach and examine structures manufactured by lithographic processes. By Joule-Thomson expansion of helium, the STM will operate at a temperature of around 1 K [1].

[1] A compact sub-Kelvin ultrahigh vacuum scanning tunneling microscope with high energy resolution and high stability L. Zhang, T. Miyamachi, T. Tomanić, R. Dehm and W. Wulfhekel

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