Nisar Muhammad Shemyal, Iqbal Shahid, Zhou Linjie
Sino-British College, University of Shanghai for Science and Technology, Shanghai 200093, China.
School of Electronics and information Engineering, Shenzhen University, Shenzhen 518060, China.
Micromachines (Basel). 2022 Dec 9;13(12):2185. doi: 10.3390/mi13122185.
Metasurfaces are useful subwavelength structures that can be engineered to achieve useful functionality. While most metasurfaces are passive devices, Phase Change Materials can be utilized to make active metasurfaces that can have numerous applications. One such application is on-chip beam steering which is of vital utility for numerous applications that can potentially lead to analog computations and non-Von Neumann computational architectures. This paper presents through numerical simulations, a novel metasurface that can realize beam steering through active phase switching of in-planted arrays of phase change material, Sb2S3. For the purpose of numerical demonstration of the principle, beam focusing has been realized, on-chip, through active switching of the Sb2S3 unit cell between the amorphous and crystalline phases. The presented architecture can realize on-chip transformation optics, mathematical operations, and information processing, thus opening the gates for future technologies.
超表面是有用的亚波长结构，可以通过设计来实现有用的功能。虽然大多数超表面是无源器件，但相变材料可用于制造具有众多应用的有源超表面。其中一个应用是片上光束转向，这对于许多可能导致模拟计算和非冯·诺依曼计算架构的应用至关重要。本文通过数值模拟展示了一种新型超表面，它可以通过植入相变材料Sb2S3阵列的有源相位切换来实现光束转向。为了从数值上证明该原理，通过在非晶相和结晶相之间对Sb2S3晶胞进行有源切换，在片上实现了光束聚焦。所提出的架构可以实现片上变换光学、数学运算和信息处理，从而为未来技术打开大门。
