Determination of Optical Constants and Thickness of 3-Octylphenylthiophene/Popt by Rotating Angle Ellipsometry
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Date
2007-07
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Addis Ababa University
Abstract
When a plane polarized light is reflected from the surface of an organic sample
or thin film mounted on a glass substrate called Poly 3-Octylphemylthiophene/POPT
at some different angles of incidence around the brewster angle of the sample in
between 570 up to 610 ,then the reflected light which is elliptically polarized and its
intensity is detected by photodetector.From its intensity curve the Fourier coefficients
a and b are collected by fitting to Fast Non Linear Curve Fitting.Based on the Fourier
Coefficients the ellipsometric angle , and the amplitude coefficients (Fresnel
Coefficients) for parallel and perpendicular light rs and rp from the upper and bottom
surface of the film are computed.From the ellipsometric angles and Fresnel coefficients
the optical parameters of the sample such as refractive index, extinction coefficients
and the film thickness are determine[5]
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Keywords
Determination of Optical Constants