【作者】 孙侃；

【导师】 刘继芳；

【作者基本信息】 西安电子科技大学 ， 光学工程， 2009， 硕士

【摘要】 光电导开关具有极其优良的特性,在超宽带电磁波源、高功率微波发生器、宽带通信等领域具有广泛的应用前景。特别是光电导开关作为辐射天线产生THz电磁波有着广阔的应用价值和重大意义。本文主要针对光电导开关的输出特性进行理论和实验研究。本文对于应用于产生太赫兹波的光电导开关的两种基本工作模式的特性进行了比较和分析。理论上分析了光电导开关对于不同波长的光吸收机制,重点讨论了光子能量小于GaAs禁带宽度的激光触发开关的非本征光吸收。对光电导开关的线性工作模式和非线性工作模式进行了详细的实验研究,研究了偏置电压和触发光脉冲能量、触发光脉冲个数、触发光脉冲间隔对光导开关输出的影响;发现了光电导开关非线性导通时的载流子累加效应;研究了非线性导通对光电导开关材料的损伤物理机制。更多还原

【Abstract】 Photoconductive Semiconductor Switches (PCSS) have a very broad prospect of applications in numerous fields such as the source generating high power ultra-wideband electromagnetic wave, high power microwave oscillator and broad-band communication because of their excellent characteristics. Especially PCSS as antennas generating THz electromagnetic radiation have a broad application value and great significance. So the output characteristics of PCSS have been investigated theoretically and experimentally in this dissertation.Two basic characteristics of work pattern about the photoconductive switches were compared and analyzed in this article. Different wavelengths of light absorption mechanism were analyzed theoretically about PCSS with emphases on the optical absorption of which the photon energy is less than that of GaAs bandgap. Detail experiments were carried out of the linear and nonlinear modes of PCSS. The impacts of the bias voltage and triggering optical pulse energy, triggering numbers of light pulses and triggering light pulse interval on the electrical pulse output were investigated. It has been found the current carrier additive effect in nonlinear mode of the PCSS. The damage mechanism of PCSS in nonlinear mode was also analyzed.更多还原