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Proceedings Paper

Modeling of polarizing grids from mid-infrared to submm wavelengths
Author(s): Marc Ferlet
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Paper Abstract

A brief review of the classical theories for modeling of wire grid-based polarizing element is given. A method based on the exact Green's function approach is chosen, with additional features from recent scattering theory developed for periodic structure modeling. At the heart of it are closed-form analytic expressions specially derived here for the computations of the lattice sums coefficients, first in the normal incidence case and then generalized to any incidence. An algorithm is drawn and implemented in a numerical code to compute the amplitude and intensity reflection and transmission coefficients, for both p and s polarization orientation, as function of incident radiation wavelength. Only physical parameters (wire diameter and spacing, wire material complex index and wavelength), which are the main design variables for such components, are needed as inputs with the exception of the number of cylindrical harmonics used to describes the local field around each wire. It is checked that the resulting code is stable with this extra numerical parameter and convergence is fast leading to reduced overall computation time even in broad spectral range case. Application of the method is illustrated with examples taken from the design of polarizing grids and polarizing beamsplitters for both mid/far-infrared earth observation instrument and sub-mm ground based instrumentation.

Paper Details

Date Published: 18 August 2005
PDF: 12 pages
Proc. SPIE 5867, Optical Modeling and Performance Predictions II, 586716 (18 August 2005); doi: 10.1117/12.614802
Show Author Affiliations
Marc Ferlet, Rutherford Appleton Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 5867:
Optical Modeling and Performance Predictions II
Mark A. Kahan, Editor(s)

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