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Single-Layer-Coated Beam Splitters For The Division-Of-Amplitude Photopolarimeter, Rasheed M.A. Azzam, Faisal F. Sudradjat
Single-Layer-Coated Beam Splitters For The Division-Of-Amplitude Photopolarimeter, Rasheed M.A. Azzam, Faisal F. Sudradjat
Electrical Engineering Faculty Publications
A design procedure is presented for a near-optimal, single-layer-coated prism beam splitter that serves as the key optical element of the division-of-amplitude photopolarimeter (DOAP). For given film and substrate refractive indices, the angle of incidence and film thickness are selected such that the ellipsometric differential phase shifts in reflection and transmission Delta_r and Delta_t differ by ±pi/2, and the normalized determinant of the instrument matrix is maximized. The best results are obtained by using high-index films on low-index substrates. This is illustrated by examples of ZnS and GaP films on silica prisms in the visible and Si, Ge, and PbTe …