Metasurface‐Based Spatial Phasers for Analogue Signal Processing. Issue 18 (29th June 2020)

• Record Type: Journal Article
• Authors: Chen, Ming Zheng; Cheng, Qiang; Xia, Fen; Rashid, Amir Khurrum; Dai, Jun Yan; Zhang, Cheng; Zhang, Qingfeng; Cui, Tie Jun
• Is Part Of: Advanced optical materials. Volume 8:Issue 18(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-06-29
• Subjects: analogue signal processing -- group delay -- metasurfaces -- spatial phasers; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202000128
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: A dispersive delay structure, or phaser, is an integral part of analogue signal processor. A phaser is a circuit, whose group delay can be engineered to obtain the desired response as a function of frequency. Traditionally, phasers have been implemented in circuits or waveguide structures, but they can never deal with electromagnetic waves in free space due to limitation of natural materials. To resolve this drawback, a novel metasurface‐based structure, spatial phaser, for analogue signal processing in the spatial domain is proposed. A general design theory is put forward to realize the spatial phaser for manipulating the dispersive delay of electromagnetic waves. To demonstrate this method, three spatial phasers with different group‐delay responses are elaborately devised and a prototype that exhibits a positive‐triangular group delay from 8 to 10 GHz is fabricated. The experimental and simulation results show good agreement. This work will facilitate the development of real‐time analogue signal processing in spatial domain for applications in radars, electronic countermeasures, and other related areas. Abstract : A general design theory is proposed to synthesize metasurface‐based spatial phasers, which are kernel elements for analogue signal processing (ASP) in spatial domain. Both simulation and experiment are conducted for verification, and the results are in good agreement. This work facilitates the advance of real‐time ASP for applications in radars, electronic countermeasures, and related areas.