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