Frequency-modulated continuous waves controlled by space-time-coding metasurface with nonlinearly periodic phases

Jun Chen Ke; Jun Yan Dai; Jun Wei Zhang; Zhanye Chen; Ming Zheng Chen; Yunfeng Lu; Lei Zhang; Li Wang; Qun Yan Zhou; Long Li; Jin Shan Ding; Qiang Cheng; Tie Jun Cui

doi:10.1038/s41377-022-00973-8

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Frequency-modulated continuous waves controlled by space-time-coding metasurface with nonlinearly periodic phases

Original Articles

- Frequency-modulated continuous waves controlled by space-time-coding metasurface with nonlinearly periodic phases
- Light: Science & Applications Vol. 11, Issue 10, Pages: 2424-2434(2022)
- Affiliations：
  
  1.Institute of Electromagnetic Space, Southeast University, 210096, Nanjing, China
  2.State Key Laboratory of Millimeter Waves, Southeast University, 210096, Nanjing, China
  3.School of Electronic Engineering, Xidian University, 710071, Xi'an, China
- Author bio：
  
  Qiang Cheng (qiangcheng@seu.edu.cn)
  Tie Jun Cui (tjcui@seu.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-00973-8
  CLC：
- Published：31 October 2022，
  
  Published Online：14 September 2022，
  
  Received：25 April 2022，
  
  Revised：28 August 2022，
  
  Accepted：28 August 2022
- Accepted：
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Ke, J. C. et al. Frequency-modulated continuous waves controlled by space-time-coding metasurface with nonlinearly periodic phases. Light: Science & Applications, 11, 2424-2434 (2022).
DOI：

Ke, J. C. et al. Frequency-modulated continuous waves controlled by space-time-coding metasurface with nonlinearly periodic phases. Light: Science & Applications, 11, 2424-2434 (2022). DOI： 10.1038/s41377-022-00973-8.

摘要

Abstract

The rapid development of space-time-coding metasurfaces (STCMs) offers a new avenue to manipulate spatial electromagnetic beams

waveforms

and frequency spectra simultaneously with high efficiency. To date

most studies are primarily focused on harmonic generations and independent controls of finite-order harmonics and their spatial waves

but the manipulations of continuously temporal waveforms that include much rich frequency spectral components are still limited in both theory and experiment based on STCM. Here

we propose a theoretical framework and method to generate frequency-modulated continuous waves (FMCWs) and control their spatial propagation behaviors simultaneously via a novel STCM with nonlinearly periodic phases. Since the carrier frequency of FMCW changes with time rapidly

we can produce customized time-varying reflection phases at will by the required FMCW under the illumination of a monochromatic wave. More importantly

the propagation directions of the time-varying beams can be controlled by encoding the metasurface with different initial phase gradients. A programmable STCM prototype with a full-phase range is designed and fabricated to realize reprogrammable FMCW functions

and experimental results show good agreement with the theoretical analyses.

关键词

Keywords

references

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