Abstract
We explore effects of light dispersion by a wire-grid polarizer (WGP) in imaging polarimetry. The dispersive characteristics of a WGP, combined with off-axis scene incidence, cause significant non-uniformity. The normalized performance measure of contrast due to dispersion of WGP exceeded 0.84 for transmittance and 0.90 for extinction ratio (maximum non-uniformity at 1 and 0 for uniform performance). Dispersion also produces a lateral spread in the imaging plane, which may induce spectral image misregistration. Without higher-order excitation, the misregistration can be at the least a few pixels long in the detector. In the presence of higher-order modes, the dispersive misregistration can be severe and critical for polarized scene extraction. The results emphasize the need for an imaging polarimeter to be designed to manage the dispersive effects.
Highlights
We explore effects of light dispersion by a wire-grid polarizer (WGP) in imaging polarimetry
One of the issues that have not been fully addressed and we intend to address in this work is to understand the dispersive effects on the imaging performance which may appear in addition to typical spherical and chromatic aberration of imaging optics when WGPs are integrated for use in imaging polarimetry
Understanding the dispersive effects is critical to the design of WGPs because the polarimetry like any other imaging applications is performed in a broadband spectrum
Summary
We explore effects of light dispersion by a wire-grid polarizer (WGP) in imaging polarimetry. Many design issues of WGPs have been explored in imaging polarimetry, for example, non-uniformity in the polarimetric performance depending on the incident scene vector[39] and effect of finite pixel size[40]. Light dispersion can have an extremely severe and harmful effect on diffractive optical devices including metamaterials as recently reported for far-field applications[42,43], which may limit practical application in imaging In this sense, this study has a broad implication far greater than mere suggestion of a novel WGP design for imaging polarimetry.
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