Terahertz generation by means of ZnGeP2 large aperture photoconductive antenna

The generation of terahertz (THz) radiation using a ZnGeP2 (ZGP) large-aperture photoconductive antenna (PCA) was demonstrated. The semiconductors were excited above and below the bandgap (400 and 800 nm) by a femtosecond Ti:sapphire laser. The THz pulse waveform generated by the ZGP antenna was measured using a time-domain spectroscopy technique. The antenna's THz pulse energy dependence on the optical pump energy was measured, and saturation fluence and carrier mobility were estimated. The ZGP and a chemical vapor deposited ZnSe-based PCA were compared. (C) 2021 Society of Photo-Optical Instrumentation Engineers (SPIE)

Automated summary

This study demonstrated the generation of terahertz radiation using a ZnGeP2 large-aperture photoconductive antenna excited by a femtosecond Ti:sapphire laser. The THz pulse waveform and energy dependence on optical pump energy were measured and analyzed, with comparisons made between ZGP and ZnSe-based PCAs.