التفاصيل البيبلوغرافية
| العنوان: |
Ultraviolet Metasurfaces of ≈80% Efficiency with Antiferromagnetic Resonances for Optical Vectorial Anti‐Counterfeiting. |
| المؤلفون: |
Huang, Kun, Deng, Jie, Leong, Hai Sheng, Yap, Sherry Lee Koon, Yang, Ren Bin, Teng, Jinghua, Liu, Hong |
| المصدر: |
Laser & Photonics Reviews; May2019, Vol. 13 Issue 5, pN.PAG-N.PAG, 1p |
| مصطلحات موضوعية: |
OPTICAL resonance, DIELECTRIC materials, ULTRAVIOLET spectra, NIOBIUM oxide, DEGREES of freedom, HOLOGRAPHY |
| مستخلص: |
Metasurfaces enable the full control of electromagnetic waves over a wide spectrum. High‐efficiency transmissive metasurfaces have been demonstrated up to the visible frequencies by using dielectrics. However, extending the operating spectrum to the ultraviolet range is challenging. This is due to the strong absorption in typical dielectric materials and the inexhaustive understanding of the magnetic resonances in dielectric nanostructures. Here, a large‐bandgap material—niobium pentoxide (Nb2O5)—is introduced to engineer the ultraviolet geometric meta‐holograms to achieve a total efficiency of 79.6% at 355 nm wavelength. The employed orientation‐varying nanobricks, operating as miniaturized half‐waveplates (HWPs), are elaborately designed to excite the antiferromagnetic modes that maintain Ex component of the incident light via even antiparallel magnetic dipoles (AMDs) but reverse Ey component via odd AMDs, thereby unveiling the underlying mechanism of dielectric nano‐HWPs. By adding the polarization degree of freedom, an ultra‐channel meta‐hologram, multiplexing two orthogonal spin channels while exhibiting three outputs, is demonstrated experimentally for ultraviolet vectorial anti‐counterfeiting. This work might open the door toward high‐performance ultraviolet nanophotonics and meta‐optics. [ABSTRACT FROM AUTHOR] |
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