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Arrays of Ag split-ring resonators coupled to InGaAs single-quantum-well gain.

Nina Meinzer1, Matthias Ruther, Stefan Linden

  • 1Institut für Nanotechnologie, Karlsruhe Institute of Technology (KIT), Postfach 3640, D-76021 Karlsruhe, Germany. Nina.Meinzer@kit.edu

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Arrays of silver split-ring resonators significantly enhance light-matter interactions with InGaAs quantum wells. This coupling leads to amplified transmittance changes and faster signal decay, validated by an analytical model.

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Area of Science:

  • Plasmonics
  • Quantum Optics
  • Semiconductor Nanostructures

Background:

  • Investigating light-matter interactions is crucial for advanced optical devices.
  • Quantum wells offer unique optical properties for light manipulation.
  • Split-ring resonators provide tailored electromagnetic field confinement.

Purpose of the Study:

  • To explore the coupling effects between silver split-ring resonators and an InGaAs quantum well.
  • To quantify the enhancement in optical response due to this coupling.
  • To validate experimental findings with a theoretical model.

Main Methods:

  • Fabrication of silver split-ring resonator arrays coupled to a thin InGaAs quantum well.
  • Utilizing a femtosecond optical pump-probe spectroscopy setup at liquid-helium temperature.
  • Analyzing differential transmittance changes and temporal decay dynamics.

Main Results:

  • Observed significantly larger relative transmittance changes (up to 8%) with coupled resonators compared to bare quantum wells (1-2%).
  • Measured a much faster temporal decay component (15 ps) for coupled systems versus bare quantum wells (0.7 ns).
  • Attributed enhanced optical responses to evanescent coupling between resonators and quantum well gain.

Conclusions:

  • Evanescent coupling between split-ring resonators and quantum wells dramatically enhances optical responses.
  • The observed phenomena align well with predictions from a novel analytical toy model.
  • This study demonstrates a promising approach for optimizing light-matter interactions in nanophotonic systems.