【摘要】 本文介绍了光致电磁辐射的基本原理及应用．光致电磁辐射是一种可对晶体作无接触检测的新技术．通过研究光致电磁辐射的振幅及相位，我们可估计半导体表面的电场强度及方向，半导体的掺杂类型及浓度，晶体的对称性以及晶体的非线性极化张量元．更多还原

【Abstract】 We discuss the basic concept and applications of optically induced electroma- gnetic rediation. This electromagnetic radiation provides a novel optoelectronic technique to study electronic and optoelectronic properties of dielectrics with a co- ntactless approach. Analysis of the amplitude and the phase of the electromagnetic radiation leads to the determination of the strength and polarity of the surface st- atic field, and the doping type and concentration in semiconductors. We also di- scuss the estimation of the crystal symmetry and their nonlinear susceptibilities by using ultrafast optical rectification.更多还原