One- and two-dimensional high-spatial-frequency dielectric surface-relief gratings on a Au substrate are used to design a high-reflectance quarter-wave retarder at 70° angle of incidence and 10.6-μm light wavelength. The equivalent homogeneous anisotropic layer model is used. It is shown that equal and high reflectances (>98.5%) for the p and the spolarizations and quarter-wave retardation can ...

Cementing around the casing in oil and gas wells provides proper zonal isolation, holds place prevents fluid migration. This procedure is an important part of completing process well plugging for abandonment. Retarders are one most additives cementing if desired pumping time cementitious slurry to be achieved. These retarders can extracted from natural sources or chemically synthesized. However...

We have built a portable spectro-polarimetric machine vision system that operates at video frame rates. Our system contains only electronically controllable components, including an imaging acousto-optic tunable filter (AOTF), a phase retarder, acceptance and imaging optics, and a standard CCD-based camera. The device operates like an ordinary camera, except that a computer controls the spectra...

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