100 THz-bandwidth difference frequency generation at LaAlO3/SrTiO3 nanoscale junctions

ORAL

Abstract


We investigate the broadband nonlinear generation and detection capabilities of nanoscale junctions created at the LaAlO3/SrTiO3 interface using conductive AFM lithography. Using the large non-resonant third-order nonlinear susceptibility in SrTiO3, strong difference frequency mixing occurs when the junction is biased, leading to induced polarization that can also be detected at the junction (Ma et al, Nano Lett 13, 2884 (2013)). Here we characterize the bandwidth of the resulting THz emission, which appears to be bandwidth limited to about 100 THz for the 7 fs Ti:Sapphire laser pulse used. The ultrawide tunable bandwidth opens pathways for a new generation of THz spectroscopy on nanomaterials.

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Presenters

  • Erin Sutton

    University of Pittsburgh

Authors

  • Erin Sutton

    University of Pittsburgh

  • Lu Chen

    Univ of Pittsburgh, University of Pittsburgh, Physics, University of Pittsburgh

  • Jianan Li

    Univ of Pittsburgh, University of Pittsburgh, Department of Physics and Astronomy, University of Pittsburgh

  • Hyungwoo Lee

    University of Wisconsin-Madison, Univ of Wisconsin-Madison, University of Wisconsin, University of Wisconsin–Madison, Department of Materials Science and Engineering, University of Wisconsin-Madison, Physics, University of Wisconsin–Madison, Department of Materials Science and Engineering, University of Wisconsin - Madison

  • Jungwoo Lee

    University of Wisconsin-Madison, Department of Materials Science and Engineering, University of Wisconsin-Madison, Department of Materials Science and Engineering, University of Wisconsin - Madison

  • Chang-Beom Eom

    University of Wisconsin-Madison, Univ of Wisconsin-Madison, Univ of Wisconsin, Madison, Department of Material Science and Engineering, University of Wisconsin-Madison, Matls Sci & Eng, University of Wisconsin-Madison, University of Wisconsin, Department of Materials Science and Engineering, University of Wisconsin-Madison, University of Wisconsin–Madison, MS&E, University of Wisconsin, Physics, University of Wisconsin–Madison, Department of Materials Science and Engineering, University of Wisconsin - Madison

  • Jeremy Levy

    Univ of Pittsburgh, Physics, Univ of Pittsburgh, University of Pittsburgh, Physics and Astronomy, University of Pittsburgh, Department of Physics and Astronomy, Univ of Pittsburgh, Department of Physics and Astronomy, University of Pittsburgh, Physics, University of Pittsburgh, Physics and Astronomy, Univ of Pittsburgh