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Rotatable retarders have been developed for applications in spectroscopic, full Mueller Matrix ellipsometry in the far-IR spectral range. Several materials, such as silicon, KRS-5, and a commercial polymer plastic (TOPAS) have been utilized to achieve a fully adjustable retardation between 0° and 90°. Experimental characteristics of the rotatable retarders that utilize three- and four-bounce designs...
Forward models for the Mueller Matrix (MM) components of materials with relative magnetic permeability tensor μ≠1 are studied. 4×4 matrix formalism can be used to calculate the complex reflection coefficients and the MMs of dielectric–magnetic materials having arbitrary crystal symmetry. For materials with simultaneously diagonalizable ε and μ tensors (with coincident principal axes), analytic solutions...
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