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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Terahertz (THz) generation is crucial for various scientific and technological applications.
  • Nonlinear optical processes are key to efficient THz source development.
  • Zinc Germanium Phosphide (ZGP) is explored as a potential material for optical rectification.

Purpose of the Study:

  • To demonstrate and characterize broadband terahertz (THz) generation via optical rectification in (110)-cut ZGP.
  • To compare the THz generation performance of ZGP with established materials like Gallium Phosphide (GaP) and Gallium Arsenide (GaAs).
  • To evaluate ZGP's suitability for THz generation across a broad range of infrared excitation wavelengths.

Main Methods:

  • Optical rectification was employed for THz generation.
  • The study utilized infrared laser excitation in the wavelength range of 1150 nm to 1600 nm.
  • Peak intensities varied from 0.5 GW/cm(2) to 40 GW/cm(2) for comparative analysis.

Main Results:

  • Broadband terahertz (THz) generation was successfully demonstrated in (110)-cut ZGP.
  • ZGP exhibited a larger peak-to-peak field amplitude compared to GaP and GaAs.
  • The enhanced performance in ZGP is attributed to potentially lower nonlinear absorption or a larger second-order nonlinear susceptibility.

Conclusions:

  • Zinc Germanium Phosphide (ZGP) is a highly suitable material for broadband terahertz (THz) generation.
  • ZGP offers superior performance over GaP and GaAs for THz source applications.
  • The material's effectiveness across a wide range of infrared excitation wavelengths highlights its versatility.