Pisano Giampaolo, Savini Giorgio, Ade Peter A R, Haynes Vic
University of Manchester, School of Physics and Astronomy, Manchester, UK.
Appl Opt. 2008 Nov 20;47(33):6251-6. doi: 10.1364/ao.47.006251.
A metal-mesh achromatic half-wave plate (HWP) has been designed, manufactured, and tested for potential use in millimeter and submillimeter astronomical instruments. The prototype device presented here is based on a 12-grid Shatrow [IEEE Trans. Antennas Propag. 43, 109 (1995)] recipe to operate over the frequency range of 120-180 GHz. Transmission line modeling and finite-element analysis [Ansoft HFSS website: http://www.ansoft.com/hfss/] were used to optimize the design geometrical parameters in terms of the device transmission, reflection, absorption, phase-shift, and cross-polarization as a function of frequency. The resulting prototype device was constructed and characterized using incoherent radiation from a polarizing Fourier transform spectrometer to explore its frequency and polarization behavior. These measurements are shown to be in excellent agreement with the models. Lists of the achieved HWP performance characteristics are reported.
一种金属网消色差半波片（HWP）已被设计、制造并测试，有望用于毫米波和亚毫米波天文仪器。这里展示的原型设备基于一种12网格的Shatrow方法[《IEEE天线与传播汇刊》43, 109 (1995)]，可在120 - 180 GHz频率范围内工作。利用传输线建模和有限元分析[Ansoft HFSS网站：http://www.ansoft.com/hfss/]，根据器件的传输、反射、吸收、相移和交叉极化随频率的变化情况，对设计几何参数进行了优化。使用偏振傅里叶变换光谱仪的非相干辐射构建并表征了所得的原型设备，以探究其频率和偏振行为。结果表明这些测量与模型高度吻合。报告了所实现的半波片性能特征列表。
