Research on Plasma Grating Electrode Structure Photoconductive Antenna Based on Extraordinary Optical Transmission

The discovery of Extraordinary Optical Transmission (EOT) has greatly promoted the progress of surface plasmons from the aspects of theory and potential application. Terahertz plasma photoconductive antenna is based on the enhancement of surface electric field to achieve higher absorption of photons and stronger transmission field strength from medium to substrate material, thus achieving greater photocurrent and radiating high-power terahertz waves. In this paper, according to the strict solution of Maxwell equation, the photoconductive antenna with groove structure is simulated and analyzed, and the influence of groove depth, width and position on electric field intensity is also analyzed. The results show that the groove can effectively adjust the light wave, enhance the transmittance and local electric field.