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Improved broadband on-chip time domain terahertz spectrometer for van der Waals heterostructures

ORAL

Abstract

Time domain THz spectroscopy is a powerful technique for studying low-energy excitations in quantum materials, but is typically restricted to samples physically larger than the electromagnetic diffraction limit (~0.3 mm). We present an on-chip THz time domain spectrometer based on transmission line-coupled photoconductive switches fabricated by aligned transfer of epitaxially grown ErAs superlattices. We benchmark our bandwidth and dynamic range, which shows significant improvement over radiation damaged silicon-based devices on silicon substrates, and anticipate the technique’s use in studying dynamics and non-equilibrium phases in exfoliable van der Waals materials and heterostructures.

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Presenters

  • Alex Potts

    University of California, Santa Barbara

Authors

  • Alex Potts

    University of California, Santa Barbara

  • Joshua O Island

    University of California, Santa Barbara

  • Eric Spanton

    University of California, Santa Barbara, California NanoSystems Institute, University of California, Santa Barbara

  • Peter Kissin

    Physics, University of California, San Diego, University of California, San Diego

  • Anthony P McFadden

    UCSB, Dept. of Electrical Engineering, Univ. of California, Santa Barbara, CA, USA, University of California, Santa Barbara, Univ of California, Santa Barbara

  • Liam Cohen

    University of California, Santa Barbara

  • Chris J Palmstrom

    Materials Department, University of California, Santa Barbara, UCSB, Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara, Dept. of Electrical Engineering, Univ. of California, Santa Barbara, CA, USA, Univ. of California, Santa Barbara, Electrical and Computer Engineering Department, University of California, Santa Barbara, University of California, Santa Barbara, IEE, UC Santa Barbara, University of California Santa Barbara, Univ of California, Santa Barbara, Electrical and Computer Engineering, University of California Santa Barbara, Materials and Electrical & Comp. Eng, University of California, Santa Barbara

  • Richard Averitt

    Physics, University of California, San Diego, Physics, University Of California, San Diego, University of California, San Diego

  • Andrea Young

    Physics, University of California, Santa Barbara, Department of Physics, University of California, Santa Barbara, University of California, Santa Barbara