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  Combining grating-coupled illumination and image recognition for stable and localized optical scanning tunneling microscopy

Traeger, G. A., Teichmann, M. H., Schröder, B., & Wenderoth, M. (2023). Combining grating-coupled illumination and image recognition for stable and localized optical scanning tunneling microscopy. Review of Scientific Instruments, 94(2): 023702. doi:10.1063/5.0123604.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000C-AAB7-6 Version Permalink: https://hdl.handle.net/21.11116/0000-000D-0911-6
Genre: Journal Article

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 Creators:
Traeger, Georg A., Author
Teichmann, Marlo H., Author
Schröder, Benjamin1, Author
Wenderoth, Martin, Author
Affiliations:
1Department of Ultrafast Dynamics, Max Planck Institute for Multidisciplinary Sciences, Max Planck Society, Göttingen, DE, ou_3350152              

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 Abstract: Combining scanning tunneling microscopy (STM) and optical excitation has been a major objective in STM for the last 30 years to study light–matter interactions on the atomic scale. The combination with modern pulsed laser systems even made it possible to achieve a temporal resolution down to the femtosecond regime. A promising approach toward a truly localized optical excitation is featured by nanofocusing via an optical antenna spatially separated from the tunnel junction. Until now, these experiments have been limited by thermal instabilities introduced by the laser. This paper presents a versatile solution to this problem by actively coupling the laser and STM, bypassing the vibration-isolation without compromising it. We utilize optical image recognition to monitor the position of the tunneling junction and compensate for any movement of the microscope relative to the laser setup with up to 10 Hz by adjusting the beamline. Our setup stabilizes the focus position with high precision (<1 μm) on long timescales (>1 h) and allows for high resolution STM under intense optical excitation with femtosecond pulses.

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Language(s): eng - English
 Dates: 2023-02-02
 Publication Status: Published online
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/5.0123604
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Project name : This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Grant No. 217133147/SFB 1073 (Project No. C04)
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Title: Review of Scientific Instruments
  Abbreviation : Rev. Sci. Instrum.
Source Genre: Journal
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Publ. Info: Melville, NY : AIP Publishing
Pages: - Volume / Issue: 94 (2) Sequence Number: 023702 Start / End Page: - Identifier: ISSN: 0034-6748
CoNE: https://pure.mpg.de/cone/journals/resource/991042742033452