雪崩倍增GaAs光电导太赫兹辐射源研究进展∗
Research progress on avalanche multiplication GaAs photoconductive terahertz emitter
摘要
Abstract
GaAs photoconductive switch illuminated by a femto-second laser has been widely used in a terabertz (THz) time domain spectroscopy system as a THz wave emission antenna. Now, all of the GaAs photoconductive switches are used in linear mode. However, when the GaAs photoconductive switch operates in an avalanche multiplication mode, the power capacity of output ultrafast electric pulse is much higher than that in a linear mode. So far, nobody has proposed the idea of generating THz waves by using the GaAs photoconductive switches in the avalanche multiplication mode. In this paper, we report the feasibility and research progress of using the GaAs photoconductive switches in the avalanche multiplication mode as the THz sources. By theoretical analysis and experimental research, some results are obtained experimentally as follows. 1) The GaAs photoconductive antenna can operate in an avalanche multiplication mode when illuminated by a femto-second laser pulse with an energy on the order of nJ. 2) The maintaining time of the avalanche multiplication mode, i.e, lock-on period, can be reduced by the quenching mode of photo-activated charge domain. These results lay the foundation for generating the high intensity THz emission by the GaAs photoconductive antenna with the avalanche multiplication mechanism.关键词
GaAs光电导开关/光电导天线/光激发电荷畴/雪崩倍增Key words
GaAs photoconductive switch/photoconductive antenna/photo-activated charge domain/avalanche multiplication引用本文复制引用
施卫,闫志巾..雪崩倍增GaAs光电导太赫兹辐射源研究进展∗[J].物理学报,2015,(22):1-7,7.基金项目
国家自然科学基金重大科学仪器研制专项(批准号:61427814)、国家自然科学基金(批准号:51377133)、中国工程物理研究院太赫兹科学技术基金(批准号：CAEPTHZ201404)、中国工程物理研究院脉冲功率重点实验室(批准号：PPLF2013PZ01)、陕西省超快光电科学技术创新团队(批准号:2014KCT-13)和装备预研基金(批准号:9140C370504140C37175)资助的课题.* Project supported by the Special Fund for Key Research on Scientific Instruments of the National Natural Science Foun-dation of China (Grant No.61427814), the National Natural Science Foundation of China (Grant No.51377133), the Terahertz Science and Technology Fund of Chinese Academy of Engineering Physics (Grant No. CAEPTHZ201404), the Foundation of Pulse Power Key Laboratory of Chinese Academy of Engineering Physics (Grant No. PPLF2013PZ01), the Foundation of Shaanxi Key Science and Technology Innovation Team, China (Grant No.2014KTC-13), and the Equip-ment Pre-research Fund Project, China (Grant No.9140C370504140C37175) （批准号:61427814）
