Shitvov Alexey, Pisano Giampaolo, Olmi Luca, Bolli Pietro, Tucker Carole
Appl Opt. 2020 Dec 1;59(34):10729-10738. doi: 10.1364/AO.403490.
A novel, to the best of our knowledge, beam-shaping reflective surface for high-resolution millimeter/submillimeter-wave astronomy instruments is presented. The reflector design is based on Toraldo's super-resolution principle and implemented with annulated binary-phase coronae structure inspired by the achromatic magnetic mirror approach. A thin, less than half a free-space wavelength, reflective Toraldo pupil device operated in the W-band has been fabricated using mesh-filter technology developed at Cardiff University. The device has been characterized on a quasi-optical test bench and demonstrated expected reduction of the beam width upon reflection at oblique incidence, while featuring a sidelobe level lower than -10. The proposed reflective Toraldo pupil structure can be easily scaled for upper millimeter and infrared frequency bands as well as designed to transform a Gaussian beam into a flat-top beam with extremely low sidelobe level.
据我们所知，本文提出了一种用于高分辨率毫米波/亚毫米波天文仪器的新型光束整形反射面。该反射器设计基于托拉尔多的超分辨率原理，并采用了受消色差磁镜方法启发的环形二元相位日冕结构来实现。利用卡迪夫大学开发的网格滤波器技术，制造了一种在W波段工作的薄型反射托拉尔多光瞳装置，其厚度小于自由空间波长的一半。该装置已在准光学测试台上进行了表征，并证明在斜入射反射时光束宽度会按预期减小，同时旁瓣电平低于-10。所提出的反射托拉尔多光瞳结构可以很容易地扩展到更高的毫米波和红外频段，也可以设计成将高斯光束转换为具有极低旁瓣电平的平顶光束。
