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Polypropylene embedded metal mesh broadband achromatic half-wave plate for millimeter wavelengths

Zhang, Jin, Ade, Peter A. R., Mauskopf, Philip Daniel, Savini, Giorgio, Moncelsi, Lorenzo and Whitehouse, Nicola Jane 2011. Polypropylene embedded metal mesh broadband achromatic half-wave plate for millimeter wavelengths. Applied Optics 50 (21) , pp. 3750-3757. 10.1364/AO.50.003750

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We describe a novel multilayered metal-mesh achromatic half-wave plate (HWP) for use in astronomical polarimetric instruments. The HWP is designed to operate across the frequency range from 125 to 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 modeling and three-dimensional electromagnetic simulations are used to optimize the parameters of the metal-mesh patterns and to evaluate their optical properties. A prototype HWP has been fabricated, and its performance is characterized in a polarizing Fourier transform spectrometer. The device performance is consistent with the modeling, 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Optical Society of America
ISSN: 0003-6935
Last Modified: 06 Sep 2020 15:05

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