Tip-controlled Strong Coupling with Infrared Polaritonic Heterostructures

ORAL

Abstract

Infrared polaritonic metasurfaces based on a multi-quantum-well intersubband transition coupled to a gold antenna heterostructure exhibit record-high nonlinear optical responses and optical power limiting behavior. However, these structures are limited to passive performance depending on fabrication parameters. Here, we use infrared scattering scanning near-field optical microscopy to image single antenna quantum well heterostructures, and to actively tune quantum-well saturation, coupling strength, and quantum path interference through manipulation of the nanocavity mode volume through tip-sample distance control. Further, the AFM tip as a coupled antenna resonator is used to enhance far-field coupling to control photon emission, field orientation, and nanoscopic field heterogeneity. Previous picosecond laser far-field optical power limiting and pump-probe characterization is extended with near-field spectroscopy, using femtosecond laser, picosecond laser, and synchrotron infrared light sources.

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Presenters

  • Samuel C. Johnson

    • University of Colorado Boulder

Authors

  • Samuel C. Johnson

    • University of Colorado Boulder

  • Nishant Nookala

    • Department of Electrical & Computer Engineering, The University of Texas at Austin

  • Mikhail A. Belkin

    • Walter Schottky Institute and ECE Department, Technical University of Munich

  • 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