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