摘要
248nm波长照明的紫外显微镜能够获得高达80nm的光学分辨率,可以实现对掩模板的线宽和一维/二维栅格参数的测量。作为测量仪器的248nm紫外显微镜需要对其进行校准。该显微镜测量范围在nm量级,校准使用400nm一维栅格标准物质,通过对仪器不确定度和标准物质自身不确定度的评估,得到采集图像每个像素的扩展不确定度为0.178nm,并给出了实际测量时的不确定度评价公式。
When utilizing 248 nm ultraviolet illumination, the microscope can attain as high as 80nm optical resolution, which can achieve the measurements of linewidth and one /two dimensional pitches of photomasks. But at present, the measurement uncertainty of 248 nm UV microscope is not known yet, it is need to do calibration for the instrument. Since the measurement range of 248 nm UV microscope is within uanometer range, it is reasonable to use 400 nm one dimensional pitches standard materials to do calibration. Through the estimation of instrument uncertainty and standard materials own uncertainty, it can calculate the expansion uncertainty of a single pixel which equals to 0. 178 nm, and the uncertainty estimation formula of measurements are given.
出处
《计量学报》
CSCD
北大核心
2015年第1期6-9,共4页
Acta Metrologica Sinica
基金
国家科学支撑计划课题(2011BAK15B01
2011BAK15B02)
关键词
计量学
248
nm
紫外显微镜
线宽校准
栅格标准物质
Metrology
248 nm
Ultraviolet microscope
Linewidth calibration
Pitches standard materials