Intense terahertz radiation from jum-gap GaAs photoconductive antenna
The terahertz pulse energy from photoconductive antenna is mainly derived from that stored in the static bias field. To obtain high intense THz radiation, the distribution of electrical field in semi-insulating GaAs photoconductive antennas was studied at square DC bias voltage. Due to the trapenhanced space-charge, the electrical field is enhanced at anode and extent to cathode. So the highest effective terahertz radiation is obtained when the laser beam just overlaps the gap. A larger laser beam can reduce the Coulomb screening and radiation screening caused by a focused smaller beam, so the larger beam can increase the efficiency of antenna. At the same electrical field and laser power, an antenna with a larger gap can generate more intensive terahertz radiation than that with a smaller gap.
L Hou W Shi
Department of Applied Physics, Xian University of Technology, No.5, South Jinhua Road, Shaanxi 7100 Department of Applied Physics, Xian University of Technology, No.5, South Jinhua Road, Shaanxi 7100
国际会议
3rd International Photonics & OptoElectronics Meetings(第三届国际光子与光电子学会议 POEM 2010)
武汉
英文
1-5
2010-11-03（万方平台首次上网日期，不代表论文的发表时间）