Journal
OPTICS AND LASERS IN ENGINEERING
Volume 112, Issue -, Pages 145-150Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2018.09.005
Keywords
Ellipsometry; Phase-shifting technique; Thickness measurement; Nanofilm
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Funding
- JSPS [16H04548, 17K14848]
- Grants-in-Aid for Scientific Research [17K14848, 16H04548] Funding Source: KAKEN
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Three-step phase-shifting imaging ellipsometry is proposed for the dynamic measurement of a nanofilm's thickness profile in two dimensions. The designed apparatus consists of an ellipsometric optical configuration and an image-processing unit to perform phase-shifting imaging ellipsometry measurements, a key technique used to achieve dynamic and two-dimensional measurements. The uncertainties of the ellipsometric parameters yr and A were evaluated based on the developed optical system and the proposed three-step phase-shifting technique. The thickness profile of a SiO2 nanofilm on a silicon substrate was measured to calibrate the proposed apparatus; results were comparable to those obtained by a commercial spectroscopic ellipsometer. The measured thickness profiles are almost flat over the area of 1.10 nun x 2.21 mm with the spatial resolutions of 1.58 and 4.62 mu m in the horizontal and vertical directions, respectively. The differences of average thickness between the proposed apparatus and a commercial spectroscopic ellipsometer were less than 3 nm. Furthermore, measurement precision was validated by obtaining a standard deviation of less than 2.5 nm.
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