Analytical study of the principal angle used in optical experiments.
An analytical method has been developed for directly calculating the principal angle theta(p) at which the phase difference between the two reflection coefficients is equal to 90 degrees and at which the ratio of /r(p)/ to /r(s)/ is equal or close to a minimum. The equations given here can be used in many optical applications. For example, ellipsometric data measured at an incidence angle theta(p) will have higher precision than data measured at other incidence angles. theta(p) is the principal angle. Instead of three principal angles, there is only one principal angle, which can be found in the region of 0 < or = theta(p) < or = 90 degrees for most metallic materials used in applications. Results show good agreement between the measured and the calculated spectra of delta(p) and rho(po).
Zhu
Xiao-Song
XS
Department of Optical Science and Engineering, Fudan University, Shanghai, China.
Zhao
Hai-Bing
HB
Zhang
Rong-Jun
RJ
Ma
Yun-Shen
YS
Liu
Zhu
Z
Li
Jing
J
Shen
Zuo-Chen
ZC
Wang
Song-You
SY
Chen
Liang-Yao
LY