Efficiency of Photoconductive Terahertz Generation in Nitrogen-Doped Diamonds

The efficiency of the generation of terahertz radiation from nitrogen-doped (& SIM;0.1-100 ppm) diamonds was investigated. The synthetic polycrystalline and monocrystalline diamond substrates were pumped by a 400 nm femtosecond laser and tested for the photoconductive emitter operation. The dependency of the emitted THz power on the intensity of the optical excitation was measured. The nitrogen concentrations of the diamonds involved were measured from the optical absorbance, which was found to crucially depend on the synthesis technique. The observed correlation between the doping level and the level of the performance of diamond-based antennas demonstrates the prospects of doped diamond as a material for highly efficient large-aperture photoconductive antennas.

Automated summary

The efficiency of terahertz radiation generation from nitrogen-doped diamonds was studied in relation to optical excitation intensity. The nitrogen concentration in the diamonds was measured and a correlation was observed between the doping level and the performance of diamond-based antennas, demonstrating the potential of doped diamond as a highly efficient material for photoconductive antennas.