Silicon multi-meta-holograms for the broadband visible light

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• 作者：Kun Huang ; Zhaogang Dong ; Shengtao Mei ; Lei Zhang ; Yanjun Liu ; Hong Liu ; Haibin Zhu ; Jinghua Teng ; Boris Luk' ; yanchuk ; Joel K.W. Yang and Cheng-Wei Qiu
• 刊名：Laser & Photonics Reviews
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：10
• 期：3
• 页码：500-509
• 全文大小：1260K
• ISSN：1863-8899

文摘

The dielectric metasurface hologram promises higher efficiencies due to lower absorption than its plasmonic counterpart. However, it has only been used, up to now, for controlling linear-polarization photons to form single-plane holographic images in the near-infrared region. Here, we report a transmission-type metahologram achieving images in three colors, free from high-order diffraction and twin-image issues, with 8-level modulation of geometric phase by controlling photon spin via precisely patterned Si nanostructures with varying orientations. The resulting real and virtual holographic images with spin dependence of incident photons natively enable the spin degeneracy removal of light, leading to a metahologram-enabled spin Hall effect of light. Low-absorption dielectrics also enable us to create holograms for short-wavelength light down to 480 nm, thus spanning the three primary colors. It possesses the potential for compact color-display chips using mature semiconductor processes, and holds significant advantages over previous metaholograms operating at longer wavelengths.