Deterministic Approach to Achieve Broadband Polarization-Independent Diffusive Scatterings Based on Metasurfaces
| Autor: | Xiaohui Ling, Tong Cai, Shiwei Tang, Xiao-Kuan Zhang, Shulin Sun, Qiong He, Shaojie Ma, He-Xiu Xu, Lei Zhou |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Frequency band business.industry 020206 networking & telecommunications 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) Electromagnetic radiation Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Optics Broadband 0202 electrical engineering electronic engineering information engineering Incident energy Electrical and Electronic Engineering 0210 nano-technology business Biotechnology |
| Zdroj: | ACS Photonics. 5:1691-1702 |
| ISSN: | 2330-4022 |
| Popis: | 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 s... |
| Databáze: | OpenAIRE |
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