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Area of Science:

  • Spintronics
  • Terahertz (THz) Photonics
  • Condensed Matter Physics

Background:

  • Terahertz (THz) radiation generation is crucial for various scientific and technological applications.
  • Existing THz emitters often rely on nonlinear optical crystals, which can have limitations in terms of efficiency and tunability.
  • The inverse spin Hall effect offers a promising alternative pathway for THz generation through spintronic mechanisms.

Purpose of the Study:

  • To report on the generation of pulsed broadband THz radiation using the inverse spin Hall effect in Fe/Pt bilayers.
  • To optimize the spintronic THz emitter for enhanced performance, including bandwidth and efficiency.
  • To compare the performance of the developed spintronic THz emitter with established THz generation techniques.

Main Methods:

  • Fabrication and optimization of Fe/Pt bilayer structures on MgO and sapphire substrates.
  • Utilized simulations to model spin current generation, diffusion, and accumulation within the Fe/Pt layers.
  • Employed a silicon lens to enhance THz radiation collection efficiency.
  • Characterized the generated THz radiation using a low-temperature-grown GaAs (LT-GaAs) photoconductive antenna as a detector.

Main Results:

  • Optimized Fe/Pt bilayers achieved a THz radiation bandwidth of up to 8 THz.
  • The THz pulse duration was as short as 220 fs, driven by a sub-100 fs pump laser pulse.
  • Efficient THz generation was achieved with low average pump powers (25 mW at 75 MHz repetition rate).
  • Experimental results showed qualitative agreement with theoretical simulations of spin current dynamics.

Conclusions:

  • The developed spintronic THz emitter demonstrates significant potential for broadband THz generation.
  • The performance metrics achieved make this spintronic approach compatible with established THz emitters.
  • Further optimization could potentially overcome limitations imposed by detector response and pump laser pulse duration.