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New modalities for cryogenic nano-imaging and -spectroscopy

ORAL

Abstract

Scanning nano-optical imaging and -spectroscopy have emerged as powerful tools in investigating and understanding heterogeneities and underlying physics in a wide range of organic, layered van der Waals, and correlated electron materials. However, the extension to variable and low temperatures has remained a major experimental challenge, yet highly desirable with many fundamental properties and phase transitions only emerging far below room temperature. Here, we present the development of cryogen-free variable temperature infrared nano-imaging and spectroscopy, as well as variable temperature tip-enhanced photoluminescence and nano-Raman spectroscopy in different instruments based on closed cycle cryocoolers with an exchange gas cooled low vibration interface. At the example of surface plasmon polariton nano-imaging in graphene, we establish infrared scattering scanning near-field optical microscopy (s-SNOM) at temperatures as low as 15 K with spatial resolution of 10 nm. Further, we demonstrate tip-enhanced photo-luminescence (TEPL) and tip-enhanced Raman spectroscopy (TERS) of different excitonic systems based on 2D transition metal dichalcogenide (TMD) heterostructures.

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Presenters

  • Sven A. Doenges

    Department of Physics, Department of Chemistry and JILA, University of Colorado, Boulder, Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder

Authors

  • Sven A. Doenges

    Department of Physics, Department of Chemistry and JILA, University of Colorado, Boulder, Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder

  • Kyoung-Duck Park

    University of Colorado, Boulder, Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, Physics, Chemistry, and JILA, University of Colorado, Boulder

  • tao jiang

    University of Colorado, Boulder, Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder

  • Fabian Menges

    Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder

  • Markus B. Raschke

    University of Colorado, Boulder, Physics and Chemistry, University of Colorado, Boulder, University of Colorado Boulder, Department of Physics, Department of Chemistry, and JILA, University of Colorado - Boulder, Department of Physics, Department of Chemistry and JILA, University of Colorado, Boulder, Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, Physics, University of Colorado, Boulder, Physics, Chemistry, and JILA, University of Colorado, Boulder