Frequency coding all-dielectric metasurface for flexible control of electromagnetic radiation
| Autor: | Tai Cheng Li, Wen Juan Zhou, Jia Huang Huang, Hao Dong Li, Lei Zhu, Chun Hui Zhao, Liang Dong |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Physics business.industry Frequency band Holography Phase (waves) Physics::Optics 02 engineering and technology General Chemistry Dielectric 021001 nanoscience & nanotechnology 01 natural sciences Electromagnetic radiation law.invention Quality (physics) Optics law 0103 physical sciences General Materials Science Sensitivity (control systems) 0210 nano-technology business Energy (signal processing) |
| Zdroj: | Applied Physics A. 127 |
| ISSN: | 1432-0630 0947-8396 |
| DOI: | 10.1007/s00339-020-04220-y |
| Popis: | In this paper, a frequency coding all-dielectric metasurface is proposed, which are achieved by simultaneously encoding dielectric unit cells with phase and frequency phase sensitivity information. The frequency phase sensitivity refers to the derivative of phase over working frequency band, which can be used to shape the phase distribution varying as desired by changing the frequency. A variety of tunable, high efficiency and versatile electromagnetic (EM) energy radiations can be realized in a dielectric coding metasurface without changing the coding distribution map and introducing any active devices. As proofs of concept, it has been demonstrated theoretically and numerically that the distinct functionalities are accomplished for the normal incidences of plane EM waves, including frequency controls of multibeam generation, anomalous deflection, vortex beam generation, and diffuse scattering. This work may be utilized in many application scenarios, such as 5G wireless communications and high quality of holograms. |
| Databáze: | OpenAIRE |
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