Improving the Efficiency of LT-GaAs Photoconductive Arrays on Optically Transparent Substrates for High Field THz Generation

An improved electrode geometry is developed for LT-GaAs photoconductive antenna arrays fabricated on transparent sapphire substrates to generate high field THz radiation. These improved geometries target more efficient field generation through supporting high biases, higher filling factors and supporting higher transient photocurrents. Each modification to electrode design is characterised for its effect on THz field generation.