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Figure 11


Fig. 11. The reflectance of the facet lens surface with paraboloid and sinusoidal nipples as a function of the angle of incidence and polarization, for light of wavelength 530 nm. The value of the refractive index of the facet lens medium is 1.52 (Vogt, 1974). (A) The reflectance for TE waves. (B) The reflectance for TM waves. For a smooth surface, that is in the absence of nipples, the reflectance for TM waves falls to zero at the Brewster's angle {alpha}=arctan(1.52)=56.7°. Both types of nipples strongly reduce the reflectance at angles of incidence below 50°, but at larger values the reflectance rapidly rises. A Brewster's angle only exists in the absence of nipples.





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