期刊
ACS PHOTONICS
卷 5, 期 5, 页码 1691-1702出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b01036
关键词
broadband; diffusive scattering; focusing-phase; metasurface; Pancharatnam-Berry phase
类别
资金
- National Natural Science Foundation of China [11734007, 61501499, 11474057, 11674068, 11404063, 11604167]
- National Key Research and Development Program of China [2017YFA0303500]
- National Defense Foundation of China [2201078]
- Innovative Talents Cultivate Program of Shaanxi Province [2017KJXX-24]
- Shanghai Science and Technology Committee [16JC1403100, 16ZR1445200]
- Natural Science Foundation of Shaanxi Province [2016JQ6001]
- Aviation Science Foundation of China [20161996009]
Diffusive scatterings of electromagnetic (EM) waves by a thin screen are important in many applications, but available approaches cannot ensure uniform angular distributions of low-intensity scatterings without time-consuming optimizations. Here, we propose a robust and deterministic approach to design metasurfaces to achieve polarization-independent diffusive scatterings of EM waves within an ultrabroad frequency band and for wide-range of incident angles. Our key idea is to use high-efficiency Pancharatnam Berry meta-atoms to form subarrays exhibiting focusing reflection-phase profiles, that can guarantee nearly uniform diffusive scatterings for arbitrarily polarized EM waves. As an illustration, we design and fabricate two metasurfaces and experimentally characterize their wave-diffusion properties in C, X, and Ku bands. Theoretical, numerical and experimental results demonstrate that our approach can diffuse the incident energy much more uniformly than available approaches based on the uniform-phase subarrays, thanks to the intrinsic wave-diffusion capabilities of the focusing-phase subarrays. The 7 dB fractional bandwidth is measured the diffusive scattering behavior can be preserved up to 60 off-normal incidence irrespective of incident polarizations. approach, simple and robust, can help realize stealth applications under bistatic detections.
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