Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2011-06-29
Applied Optics, vol. 51, Iss. 2, pp. 197-208 (2012)
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
25 pages, 10 figures, accepted by Applied Optics
Scientific paper
We investigate the polarization modulation properties of a variable-delay polarization modulator (VPM). The VPM modulates polarization via a variable separation between a polarizing grid and a parallel mirror. We find that in the limit where the wavelength is much larger than the diameter of the metal wires that comprise the grid, the phase delay derived from the geometric separation between the mirror and the grid is sufficient to characterize the device. However, outside of this range, additional parameters describing the polarizing grid geometry must be included to fully characterize the modulator response. In this paper, we report test results of a VPM at wavelengths of 350 microns and 3 mm. Electromagnetic simulations of wire grid polarizers were performed and are summarized using a simple circuit model that incorporates the loss and polarization properties of the device.
Chuss David T.
Henry Ross
Hui Howard
Juarez Aaron J.
Krejny Megan
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