変調照明シフトによる超精密加工表面の超解像光学式欠陥計測に関する研究(第2報) : 定在波照明シフト実験による解像原理の実験的検証

概要

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Demands for ultra-precision machined surface such as semiconductor wafer are rapidly growing. However, shrinking design rules of the semiconductor reduce process yield in manufacturing line. One of the biggest factors of the reduced yield is a nano-defect on the large area surface, so we must develop a defect measurement system with higher resolving power, throughput, non-destructiveness and robustness. Therefore an optical method with higher resolving power beyond the Rayleigh limit is required. In order to develop an optical inspection system with high resolving power, we have proposed the application of the structured light illumination (SLI) microscopy for the defect measurement of the ultra-precision machined surface. It is expected that the resolving power of the system exceed the Rayleigh limit by the SLI, and the robustness is enhanced by a image reconstruction algorithm using multiple images with shifts of the SLI. In the second report, to verify the resolution property experimentally, we developed the apparatus for the basic experiment and performed the super-resolution experiment using line and space sample. As a result, the sample structures were clearly resolved beyond the Rayleigh limit, and improvement of robustness with redundant shift was experimentally confirmed.
2008-06-05