Systematic effects induced by a flat isotropic dielectric slab

Details Systematic effects induced by a flat isotropic dielectric slab Systematic effects induced by a flat isotropic dielectric slab

2006-02-27

arxiv.org/abs/astro-ph/0602588v1

Appl.Opt. 45 (2006) 5168-5184

Astronomy and Astrophysics

Astrophysics

Accepted for pubblication in Applied Optics, 32 pages, 14 figures (N. 37 ".png", ".bb"). Better quality figures available from

Scientific paper

10.1364/AO.45.005168

The instrumental polarization induced by a flat isotropic dielectric slab in microwave frequencies is faced. We find that, in spite of its isotropic nature, such a dielectric can produce spurious polarization either by transmitting incoming anisotropic diffuse radiation or emitting when it is thermally inhomogeneous. We present evaluations of instrumental polarization generated by materials usually adopted in Radioastronomy, by using the Mueller matrix formalism. As an application, results for different slabs in front of a 32 GHz receiver are discussed. Such results are based on measurements of their complex dielectric constant. We evaluate that a 0.33 cm thick Teflon slab introduces negligible spurious polarization ($< 2.6 \times 10^{-5}$ in transmission and $< 6 \times 10^{-7}$ in emission), even minimizing the leakage ($< 10^{-8}$ from $Q$ to $U$ Stokes parameters, and viceversa) and the depolarization ($\sim 1.3 \times 10^{-3}$).

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