Auto-alignment for incident angle of ellipsometer

Sunglim Park; Jaewha Jung; Jeongwoo Seo; Dong Kyun Kang; Dae gab Gweon

doi:10.1117/12.444104

4 October 2001 Auto-alignment for incident angle of ellipsometer

Sunglim Park, Jaewha Jung, Jeongwoo Seo, Dong Kyun Kang, Dae gab Gweon

Proceedings Volume 4564, Optomechatronic Systems II; (2001) https://doi.org/10.1117/12.444104
Event: Intelligent Systems and Advanced Manufacturing, 2001, Boston, MA, United States

Abstract

In this paper, we present a 3-step auto-alignment algorithm for the incident angle of an ellipsometer without auxiliary equipment. The 3-step algorithm uses only a 3-axis precision stage (two rotation and one translation) for ellipsometric incident angle alignment, and consists of two incident angles and its following corrective process. The corrective process is to position the spot on the center of the detector's aperture plane, and consists of accessing and centering on the detector's aperture. In the first step, the polarizer and analyzer arm are set at a proper incident angle and the spot is centered on the detector's aperture by the corrective process. In the second step, the polarizer and analyzer arm are set at a measured incident angle and the spot is centered on the detector's aperture by the corrective process. In the third step, height error and angle errors of the specimen are calculated with the stage's angle from the first and second steps. Finally, locating the specimen stage at an errorless position completes incident angle alignment. We modeled 3-D optical paths using a homogeneous transformation matrix (HTM), and simulated the developed alignment algorithm. The results showed that the developed alignment algorithm works well. Experiment results also revealed good agreement on the simulation. The developed alignment algorithm may be applied to other alignment problems, such as tilt alignment of lithography.

Citation Download Citation

Sunglim Park, Jaewha Jung, Jeongwoo Seo, Dong Kyun Kang, and Dae gab Gweon "Auto-alignment for incident angle of ellipsometer", Proc. SPIE 4564, Optomechatronic Systems II, (4 October 2001); https://doi.org/10.1117/12.444104

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KEYWORDS

Sensors

Signal detection

Algorithm development

Polarizers

Signal processing

Detection and tracking algorithms

Optical alignment

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