| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Phase-Gradient Metasurfaces Based on Local Fabry–Pérot Resonances |
| Yanyan Cao1, Bocheng Yu1, Yangyang Fu2, Lei Gao1*, and Yadong Xu1* |
1School of Physical Science and Technology, Soochow University, Suzhou 215006, China
2College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
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| Cite this article: |
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Yanyan Cao, Bocheng Yu, Yangyang Fu et al 2020 Chin. Phys. Lett. 37 097801 |
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Abstract In this work, we present a new mechanism for designing phase-gradient metasurfaces (PGMs) to control an electromagnetic wavefront with high efficiency. Specifically, we design a transmission-type PGM, formed by a periodic subwavelength metallic slit array filled with identical dielectrics of different heights. It is found that when Fabry–Pérot (FP) resonances occur locally inside the dielectric regions, in addition to the common phenomenon of complete transmission, the transmitted phase differences between two adjacent slits are exactly the same, being a nonzero constant. These local FP resonances ensure total phase shift across a supercell, fully covering a range of 0 to $2\pi$, satisfying the design requirements of PGMs. Further research reveals that, due to local FP resonances, there is a one-to-one correspondence between the phase difference and the permittivity of the filled dielectric. A similar approach can be extended to the reflection-type case and other wavefront transformations, creating new opportunities for wave manipulation.
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Received: 29 June 2020
Published: 01 September 2020
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| PACS: |
78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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42.79.Dj
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(Gratings)
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42.25.Gy
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(Edge and boundary effects; reflection and refraction)
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11974010, 11604229 and 11774252), the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20161210 and BK20171206), the China Postdoctoral Science Foundation (Grant No. 2018T110540), the Qinglan Project of Jiangsu Province of China (Grant No. BRA2015353), and the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions. |
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