Improved Large Area Photoconductive Antenna Design for High Field THz Generation

An improved large area design has been developed for LT-GaAs photoconductive antenna arrays fabricated on optically transparent sapphire substrates to generate high field terahertz (THz) radiation. By optimising a design to support larger biasing fields, a 1.5 times improvement in signal strength resulting in fields of up to $\sim 200$ kV/cm is reported.