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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