Journal
NANOPHOTONICS
Volume 11, Issue 1, Pages 21-32Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2021-0459
Keywords
anomalous refraction; deflection efficiency; generalized Snell's law; metasurfaces; nanophotonics
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Funding
- National Natural Science Foundation of China [51776051]
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This paper discusses the conditions for establishing the generalized Snell's law of refraction in all-dielectric metasurfaces, and summarizes the relationship between the highest achievable anomalous refraction efficiency and the number of nanoparticles. Additionally, conditions for establishing the polarization-independent generalized Snell's law of refraction are presented.
The generalized Snell's law dictates that introducing a phase gradient at the interface of two media can shape incident light and achieve anomalous reflection or refraction. However, when the introduced phase gradient is realized via the scattering of nanoparticles in the metasurfaces, this law needs to be modified; certain conditions need to be met when the law is established. We present the conditions for establishing the generalized Snell's law of refraction in all-dielectric metasurfaces under the incidence of different polarized light. These conditions can provide theoretical bases for the subsequent design of high-efficiency beam deflection metasurfaces. The relationship between the highest achievable anomalous refraction efficiency and the number of nanoparticles within one period of the metasurface is also summarized. In addition, the generalized refraction should not depend on the polarization states of incident light; however, the previous realization conditions of anomalous refraction were sensitive to the polarization states. Thus, conditions for establishing the polarization-independent generalized Snell's law of refraction in all-dielectric metasurfaces are presented.
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