Intense Terahertz Radiation from GaAs Photoconductive Antenna Array
In this paper, we fabricated an intense photoconductive antenna array with eight antenna units. Each unit has separate electrodes and could be operated independently. The spacing between electrodes and the width of the electrodes are 150 μm and 10 μm, respectively. The substrate is commercial semi-insulating GaAs. The electrode pattern is made using a conven-tional photolithography technique. Ohmic contacts are obtained by using a standard mixture of Ni/Au-Ge/Au for the metallization and the thickness is 700 nm. The antenna array is mounted in an integrated circuit shell with ceramic substrate. Those antennas are tested by TDS-Z2 system made in Zomega Terahertz Corporation. A fiber laser (IMRA F-100) has been used in the system as the excitation source for the generation of THz radiation. The pump beam has a power of 90mW, wavelength of 800nm and the 1/e beam diameter on the emitter surface is about 20 1m, and so only one antenna unit is illuminated in our experiment. The field waveform is measured using an electrooptic sampling method employing a 1-mm-thick ZnTe crystal. To understand the behavior of interdigital antenna array, THz transmission through the ceramic substrate is measured. Only 23％ of THz wave transmitted through the substrate. If a hole is drilled through the ceramic substrate to make THz wave go through, the THz amplitude of antenna unit will increase more than 4 times, and the THz amplitude from the antenna unit is 4/3 times larger than the THz amplitude from the stripline antenna at the same electrical field.
Wei Shi Hong Xue Xiangrong Ma Zhenzhen Zhang
Department of Applied Physics,Xian University of Technology,Shaanxi 710048,China
国际会议
Progress in Electromagnetics Research Symposium 2009(2009年电磁学研究新进展学术研讨会)(PIERS 2009)
北京
英文
1698-1701
2009-03-23（万方平台首次上网日期，不代表论文的发表时间）