Dielectric Meta-Holograms Enabled with Dual Magnetic Resonances in Visible Light
Dielectric Meta-Holograms Enabled with Dual Magnetic Resonances in Visible Light
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在可见光下实现双磁共振的介电元全息图
DOI：
10.1021/acsnano.7b04868
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发表时间：
2017-09-01
期刊：
影响因子：
17.1
通讯作者：
Qiu, Cheng-Wei
中科院分区：
文献类型：
--
作者：
Li, Zile;Kim, Inki;Qiu, Cheng-Wei
基于惠更斯原理，利用高折射率介电纳米结构已实现了高效透射型超表面全息图。至关重要的是，要对构建单元的几何尺寸进行单独合理优化，以实现电偶极子和磁偶极子的光谱重叠。相比之下，利用金属/绝缘体/金属结构和几何相位的反射型超表面全息图能够容易地实现高效率和小厚度。在此，我们展示了一个通用平台，用于设计基于几何相位的双磁共振超表面全息图，该全息图采用对可见光来说为四分之一波长厚度的硅纳米结构。重要的是，即使在自然光照射下，无需接收屏也能清晰地观察到投影的全息图像。在发达的半导体产业中，我们这种基于超薄磁共振的超表面全息图在防伪和信息安全方面可能具有良好的应用前景。
Efficient transmission-type meta-holograms have been demonstrated using high-index dielectric nanostructures based on Huygens principle. It is crucial that the geometry size of building blocks be judiciously optimized individually for spectral overlap of electric and magnetic dipoles. In contrast, reflection-type meta-holograms using the metal/insulator/metal scheme and geometric phase can be readily achieved with high efficiency and small thickness. Here, we demonstrate a general platform for design of dual magnetic resonance based meta-holograms based on the geometric phase using silicon nanostructures that are quarter wavelength thick for visible light. Significantly, the projected holographic image can be unambiguously observed without a receiving screen even under the illumination of natural light. Within the well-developed semiconductor industry, our ultrathin magnetic resonance-based meta-holograms may have promising applications in anticounterfeiting and information security.