Observation and control of a photoinduced terahertz plasmonic mode in InAs mushroom arrays

ORAL

Abstract

Optical tuning of complex materials paves the ways towards control of macroscopic properties while also providing insight into novel physics under non-equilibrrium conditions. We report the observation and control of a plasmonc resonance via photoexcitation in InAs mushroom metamaterial arrays. This is accomplished using optical pump broadband THz probe spectroscopy. A dramatic blueshift of plasmon resonance occurs (from ~1 to 7 THz) with increasing photoexcitation fluence. Clear signatures of plasmon-optical phonon coupling are observed, in agreement with simulations. In this presentation, we will clarify how the mushroom geometry provides dielectric isolation, thereby enabling broad photoinduced plasmonic tunability.

*The authors acknowledge funding from the Defense Advanced Research Projects Agency (DARPA), Defense Sciences Office (DSO) under the Driven Nonequilibrium Quantum Systems (DRINQS) program, grant number D18AC00014.

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Presenters

  • Sheikh Rubaiat Ul Haque

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

Authors

  • Sheikh Rubaiat Ul Haque

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

  • Xiaoguang Zhao

    • Mechanical Engineering, Boston University
    • Mechanical Engineering, Boston university

  • Jingdi Zhang

    • Physics, The Hong Kong University of Science and Technology
    • Physics, Hong Kong University of Science and Technology

  • Stephen March

    • Electrical & Computer Engineering, The University of Texas at Austin

  • Seth Bank

    • Electrical Engineering, University of Texas at Austin
    • University of Texas System
    • Electrical & Computer Engineering, The University of Texas at Austin

  • Xin Zhang

    • Mechanical Engineering, Boston University
    • Mechanical Engineering, Boston university
    • Boston Univ

  • Richard Averitt

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