Automatic null ellipsometry with an interferometer
Applied Optics, Vol. 48, Issue 32, pp. 6277-6280 (2009)
http://dx.doi.org/10.1364/AO.48.006277
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Abstract
A new approach to automatic null ellipsometry is described in which the analyzer of a traditional polarizer compensator sample analyzer (PCSA) null ellipsometer is replaced with a heterodyne Michelson interferometer. One arm of this interferometer is modified such that it produces a fixed, linearly polarized reference beam, irrespective of the input polarization state. This beam is recombined interferometrically with the measurement beam and spatially separated into its p and s polarizations. The relative phase of the resulting temporal fringes is a linear function of the polarizer azimuthal angle P, and thus this component can be driven to its null position without iteration. Once at null, the azimuthal angle of the reflected, linearly polarized light is trivially determined from the relative amplitude of the fringes. Measurements made with this instrument on a native oxide film on a silicon wafer were in excellent agreement with those made with a traditional PCSA null ellipsometer.
© 2009 Optical Society of America
OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.2130) Instrumentation, measurement, and metrology : Ellipsometry and polarimetry
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
ToC Category:
Instrumentation, Measurement, and Metrology
History
Original Manuscript: July 6, 2009
Revised Manuscript: September 21, 2009
Manuscript Accepted: October 19, 2009
Published: November 5, 2009
Citation
Lionel R. Watkins, "Automatic null ellipsometry with an interferometer," Appl. Opt. 48, 6277-6280 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-32-6277
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