Active programmable metasurfaces

超材料是一种新兴的技术，在许多不同的领域都有应用。追溯到20世纪60年代Veselago开创性的理论工作，超材料是一种工程材料，它表现出天然材料中没有的物理特性。超材料研究涵盖了广泛的学科和主题领域，包括射频/微波，声学，光学，太赫兹和红外，以及机械超材料，如负压缩性和auxetics。电学超材料可以设计成具有诸如负介电常数和磁导率等奇异特性，从而导致负多普勒频移等效应。建议的博士研究将集中在可编程的电子元表面，特别是在无线电和微波频段。元表面是超材料的二维等量物，它大大减少了体积和重量，简化了制造和集成过程。大多数元表面都集中在一个特定的功能上，因此一旦设计完成，对电磁波的操纵是固定的。最近有关于可调元表面的工作，本博士将扩展这一研究，旨在设计和制造一个完全可编程的元表面。

Metamaterials are an emerging technology with applications in a range of diverse areas. Dating back to the pioneering theoretical work of Veselago in the 1960s, metamaterials are engineered materials which exhibit physical properties that are not found in natural materials. Metamaterial research covers a wide range of disciplines and topic areas including as RF/microwave, acoustics, optics, terahertz and infrared, and mechanical metamaterials such as negative compressibility and auxetics. Electrical metamaterials can be designed to exhibit exotic properties such as negative permittivity and permeability that can result in effects such as negative Doppler shift.The proposed PhD research will concentrate on programable electrical meta-surfaces particularly in the radio and microwave frequency bands.Meta-surfaces are two dimensional equivalents of metamaterials which considerably reduce volume and weight and simplify the fabrication and integration process.Most meta-surfaces have focused on a certain function so that the manipulation of the EM wave is fixed once the design is completed. There has been recent work on tunable metasurfaces and this PhD will expand this research with the aim of designing and manufacturing a fully programmable meta-surface.