Broadband terahertz pulse emission from ZnGeP2

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.