Multilayer coating design achieving a broadband 90 degrees phase shift.
For nonnormal incidence angles, it has been shown that the polarization state may be controlled through the use of specially designed multilayer coatings. An optimization technique has been used to determine layer thicknesses for a coating design that produces a 90 degrees phase shift between the p- and s-polarization components over a wavelength range of Deltalambda/lambda(0) = +/-5% while maintaining high reflectivities for both components. A tolerance analysis indicates that the coating layers must be deposited within +/-1% to achieve a +/-3 degrees phase shift error over the spectral range of the design.
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Southwell