Analysis of Photoconductive Sampling method for Micro PCSS

摘要

Via atomic force microscope (AFM)'s tip induced anodic oxidization and photolithograph method, a 100nm wide metal-insulator-metal (MIM) junction instead of an air gap was fabricated on the GaAs substrate to make a micro type photoconductive semiconductor switch (PCSS). A PCSS signal test system based on photoconductive sampling (PC) method was adopted. The PCSS's equivalent circuit mode was analyzed. The pulse width of the femtosecond laser is about 50 fs, the central wavelength is 800nm, and the pulse energy is about 1mJ with a repetition rate of 100MHz. With this equivalent mode and experiment parameters, the pulse generator's output was simulated via MATLAB. The performance of the sampling gate is analyzed, and its output charge Q{sub}s expression is explained.