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Paired circularly polarized heterodyne ellipsometer

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Abstract

We develop a paired circularly polarized heterodyne ellipsometer (PCPHE), in which a heterodyne interferometer based on a two-frequency circularly polarized laser beam is set up. It belongs to an amplitude-sensitive ellipsometer that is able to provide not only a wider dynamic range of polarization modulation frequency but also a higher detection sensitivity than that of a conventional photometric ellipsometer. A real-time and precise measurement of ellipsometric parameters, which demonstrated an accuracy of less than 1nm on thickness measurement of SiO2 thin film deposited on silicon substrate, can be applied with the PCPHE.

© 2009 Optical Society of America

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