根据光学干涉显微法原理,设计开发了一套微纳结构表面形貌测量系统。该系统采用林尼克干涉显微镜,通过参考镜扫描的方法将扫描器与相移器集为一体,分别采用五步相移算法和基于采样定理的包络均方函数(SEST)算法实现相移干涉法(PSI)和垂直扫描干涉法(VSI)两种模式对微纳结构的表面形貌测量。为验证该系统性能,采用标准多刻线样板和标准台阶作为样件对VSI和PSI两种模式分别进行了测量实验。结果证明,该系统能够完成微纳结构表面形貌的快速精确测量,可以满足微电子、微机电系统中微纳结构的表面形貌测量要求。
A profilometer was developed for micro-nano structure profile testing on the basis of interferometry and micro vision system. A Linik interferometer was adopted in this profilometer, in which the scanner and the phase shifter were integrated through scanning the reference mirror. The five-step phase-shift algorithm was selected for Phase Shift Interferometry (PSI) mode and the Squared-Envelope function estimation by Sampling Theory (SEST) algorithm was selected for Vertical Scanning Interferometry (VSI) mode. The experiments that used a standard multi-indents structure and a standard step structure to test PSI mode and VSI mode respectively verified that the profilometer could measure the profile of the micro-nano structure quickly and accurately, and be applied in the measurement of micro-electronics and micro electronic mechanic system.