Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2011-07-18
Applied Optics, Vol. 50, pp. 3750-3757, 2011
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
14 pages, 13 Figures, 1 Table
Scientific paper
10.1364/AO.50.003750
We describe a novel multi-layered metal mesh achromatic half wave plate for use in astronomical polarimetric instruments. The half wave plate is designed to operate across the frequency range from 125-250 GHz. The wave plate is manufactured from 12-layers of thin film metallic inductive and capacitive grids patterned onto polypropylene sheets, which are then bonded together using a hot pressing technique. Transmission line modelling and 3-D electromagnetic simulations are used to optimize the parameters of the metal-mesh patterns and to evaluate their optical properties. A prototype half wave plate has been fabricated and its performance characterized in a polarizing Fourier transform spectrometer. The device performance is consistent with the modelling although the measured differential phase shift for two orthogonal polarizations is lower than expected. This difference is likely to result from imperfect patterning of individual layers and misalignment of the grids during manufacture.
Ade Peter
Mauskopf Philip
Moncelsi Lorenzo
Savini Giorgio
Whitehouse Nicola
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