Pisano Giampaolo, Ng Ming Wah, Ozturk Fahri, Maffei Bruno, Haynes Vic
The University of Manchester-School of Physics and Astronomy, Manchester, UK.
Appl Opt. 2013 Apr 10;52(11):2218-25. doi: 10.1364/AO.52.002218.
A flat lens based on subwavelength periodic metal meshes has been developed using photolithographic techniques. These mesh grids are stacked at specific distances and embedded in polypropylene. A code was developed to optimize more than 1000 transmission line circuits required to vary the device phase shift across the lens flat surface, mimicking the behavior of a classical lens. A W-band mesh-lens prototype was successfully manufactured and its RF performance characterized using a vector network analyzer coupled to corrugated horn antennas. Co-polarization far-field beam patterns were measured and compared with finite-element method models. The excellent agreement between data and simulations validated our designing tools and manufacturing procedures. This mesh lens is a low-loss, robust, light, and compact device that has many potential applications including millimeter wave quasi-optical systems for future cosmic microwave background polarization instruments.
一种基于亚波长周期性金属网格的平面透镜已采用光刻技术研制而成。这些网格栅格以特定距离堆叠并嵌入聚丙烯中。开发了一种代码，用于优化超过1000个传输线电路，以改变器件在透镜平面上的相移，模拟传统透镜的行为。成功制造了一个W波段网格透镜原型，并使用与波纹喇叭天线耦合的矢量网络分析仪对其射频性能进行了表征。测量了共极化远场波束图，并与有限元方法模型进行了比较。数据与模拟之间的出色一致性验证了我们的设计工具和制造工艺。这种网格透镜是一种低损耗、坚固、轻便且紧凑的器件，具有许多潜在应用，包括用于未来宇宙微波背景偏振仪器的毫米波准光学系统。
