Nonlinear Optical Nano-imaging of Graphene

ORAL

Abstract

Nonlinear optical response offers a powerful tool for investigating a wide range of phenomena in physics, chemistry, and biology and provides a basis for future photonic and optoelectronic applications. Nonlinear optics of graphene is particularly interesting due to the unique Dirac-cone band structure, with the associated strong nonlinear response over a broad spectral range. Here, we apply the adiabatic plasmonic nanofocusing technique to study the mechanism and nanoscale spatial heterogeneity of the nonlinear optical response of graphene. We generate strong four-wave mixing (FWM) signal in monolayer and few-layer graphene with compressed surface plasmon polaritons (SPPs) at a Au nano-tip apex and investigate its heterogeneity by nonlinear imaging with nanoscale spatial resolution. We find a pronounced enhancement of the graphene FWM response at crystal edges associated with the formation of a tip-edge resonant cavity and study its mechanism and properties by spectral tuning and electrostatic gating. Our results reveal highly localized and plasmon-enhanced nonlinear optical interactions in graphene and suggest exciting possibilities of graphene-plasmon-mediated nonlinearities, with applications in photonic circuits, all-optical information processing, and quantum optics.

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Presenters

  • Tao Jiang

    Department of Physics, Department of Chemistry, JILA, and Center for Experiments on Quantum Materials, Univ of Colorado - Boulder, Fudan University, Physics, Chemistry, and JILA, Univ of Colorado

Authors

  • Tao Jiang

    Department of Physics, Department of Chemistry, JILA, and Center for Experiments on Quantum Materials, Univ of Colorado - Boulder, Fudan University, Physics, Chemistry, and JILA, Univ of Colorado

  • Vasily Kravtsov

    Department of Physics, Department of Chemistry, JILA, and Center for Experiments on Quantum Materials, Univ of Colorado - Boulder

  • Molly May

    Department of Physics, Department of Chemistry, JILA, and Center for Experiments on Quantum Materials, Univ of Colorado - Boulder, Physics, Univ of Colorado - Boulder

  • Sultan Almutairi

    Department of Physics & Astronomy, Texas A&M University

  • Alexey Belyanin

    Department of Physics & Astronomy, Texas A&M University, Texas A&M University

  • Markus Raschke

    Department of Physics, Department of Chemistry, JILA, and Center for Experiments on Quantum Materials, Univ of Colorado - Boulder, Physics, 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 at Boulder, Physics, Univ of Colorado - Boulder, Univ of Colorado - Boulder