毫米波聚丙烯嵌金属网宽带消色差半波片
Polypropylene Embedded Metal-Mesh Broadband Achromatic Half Wave Plate for Millimeter Wavelengths
摘要：
本文介绍了一种用于天文偏振仪器的新型多层金属网消色差半波片。半波片设计为在125-250 GHz的频率范围内工作。波片是由12层薄膜金属电感和电容网格图案到聚丙烯片，然后结合在一起使用热压技术。传输线建模和3-D电磁模拟用于优化金属网图案的参数，并评估其光学特性。制作了半波片样机，并在偏振傅里叶变换光谱仪上对其性能进行了表征。该设备的性能是一致的建模，虽然测得的差分相移为两个正交极化低于预期。这种差异很可能是由于制造过程中各层图案的不完美和网格的未对准造成的。
英文摘要：
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.
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