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Carrier-Envelope Phase Control in Terahertz Pulse Generation Using InAs Ribbon Metasurfaces.

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  • 1Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE, U.K.

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Summary

Researchers developed metasurfaces using indium arsenide nanoscale ribbons to generate terahertz (THz) pulses with controllable carrier-envelope phase. This breakthrough allows for precise tailoring of THz wavefronts for advanced optics and spectroscopy applications.

Keywords:
carrier-envelope phaselateral photocurrentsmetasurfacesshift currentsterahertz generation

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Broadband terahertz (THz) pulse generation with controlled polarization and carrier-envelope phase is crucial for advanced THz imaging, spectroscopy, and strong-field optics.
  • Metasurfaces offer potential for controlling THz field properties, but precise phase control remains a significant challenge.

Purpose of the Study:

  • To propose and demonstrate metasurfaces capable of generating THz pulses with variable carrier-envelope phase.
  • To achieve precise control over THz pulse waveforms for advanced applications.

Main Methods:

  • Utilized indium arsenide (InAs) nanoscale ribbon arrays as metasurfaces.
  • Explored different THz generation mechanisms activated by ribbon geometry.
  • Employed linearly polarized optical excitation.

Main Results:

  • Demonstrated metasurfaces generating THz pulses with variable carrier-envelope phase (spanning a range of π).
  • Achieved phase control over a broad frequency band (approximately 1-3 THz).
  • Showcased precise control of THz phase and amplitude solely through ribbon array geometry.

Conclusions:

  • The proposed InAs metasurfaces enable carrier-envelope phase control of broadband THz pulses.
  • This technology facilitates advanced structured THz wavefront synthesis using ultrathin dielectric metasurfaces.
  • Opens new avenues for tailored THz field generation in spectroscopy and imaging.