Carrier concentration dependence of the tunability of the dipole resonance peak in optically excited metamaterials

ORAL

Abstract

Currently, there is strong interest to explore the dynamic control of the electromagnetic properties of metamaterials, which have important implications on their optoelectronic applications. While the design, fabrication and photo-doping of metamaterial/semiconductor structures have been actively pursued, some fundamental issues related to highly photo-excited states, their dynamic tuning and temporal evolution remain open. Using optical-pump terahertz probe spectroscopy, we report on the pump fluence dependence of the electric dipole resonance tunability in metamaterials. We find a previously undiscovered large non-monotonic variation on the strength of the dipole resonance peak with the photo-injected carrier concentration.

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Authors

  • Ioannis Chatzakis

    Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA

  • Liang Luo

    Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA

  • Jigang Wang

    Dept. of Physics and Astronomy, Iowa State University; Ames Lab - USDOE, Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA, Ames Laboratory and Department of Physics and Astronomy, Iowa State University

  • Nian Hai Shen

    Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA

  • Thomas Koschny

    Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA

  • Costas Soukoulis

    Ames Laboratory, Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA