Wednesday, September 30, 2015
Abstract-Frequency-tunable continuous-wave terahertz sources based on GaAs plasmonic photomixers
We present frequency-tunable, continuous-wave terahertz based on photomixers, which offer high terahertz radiation power levels at 50% radiation duty cycle. The use of contact enhances photomixer quantum efficiency while maintaining its ultrafast operation by concentrating a large number of photocarriers in close proximity to the device contact Additionally, the relatively high thermal conductivity and high of allow operation under high power levels and long duty cycles without reaching the thermal breakdown limit of the photomixer. We experimentally demonstrate continuous-wave terahertz radiation with a radiation frequency tuning range of more than 2 THz and a record-high radiation power of 17 W at 1 THz through photomixers fabricated on a low temperature grown substrate at 50% radiation duty cycle.