Abstract
In this study, we investigate dispersive effects of a wire-grid polarizer (WGP) in imaging polarimetry. Dispersion in periodic structures such as WGP may cause dispersive misregistration in images captured in the far-field imaging system. As a measure of performance, we defined off-axis non-uniformity (<i>NT</i><sub>off</sub>) and extinction ratio (<i>ER</i><sub>off</sub>) to evaluate non-uniformity induced by off-axis imaging scene. Similarly, we considered metrics to evaluate dispersive effects as wavelength-dependent non-uniformity in extinction ratio (<i>NERλ</i>) and transmittance (<i>NTλ</i>). Significant non-uniformity in the performance of a WGP was measured: the highest non-uniformity was obtained as |<i>NT<sub>off</sub></i>|<sub>max</sub> = 0.93211 at <i>Λ</i> = 400 nm and |<i>NER<sub>off</sub></i>|<sub>max</sub> = 0.93624 at <i>Λ</i> = 600 nm, while |<i>NT<sub>λ</sub></i>|<sub>max</sub> = 0.84935 at <i>Λ</i> = 400 nm and |<i>NER<sub>λ</sub></i>|<sub>max</sub> = 0.90139 at <i>Λ</i> = 300 nm. We also present images in imaging polarimetry that suffers from dispersive effects.
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