Janus Metasurface Hologram―Back Cover of Advanced Optical Materials

Our research has been spotlighted on the back cover of Advanced Optical Materials, Volume 13, Issue 32, dated November 14, 2025.

About the Cover: A single-layer titania Janus metasurface hologram achieves directionally asymmetric imaging in the visible range. By integrating the Dammann grating principle and precise phase control, it generates high-fidelity holographic images for arbitrary polarizations, enabling compact and versatile optical technologies.

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關於封面：單層二氧化鈦雅努斯超穎介面全像片可在可見光範圍內實現具方向性的不對稱成像。透過結合德曼光柵原理與精確的相位控制，此設計能針對任意偏振光產生高保真度的全像影像，推動微型化且多功能光學技術的發展。

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Abstract: Janus metasurfaces have emerged as a powerful platform for directionally asymmetric holographic imaging. However, existing designs often suffer from limitations such as complex fabrication processes, reliance on spatial multiplexing or vertical stacking, restricted polarization control, or significant Ohmic losses—particularly preventing operation in the visible spectrum. In this research, we report single-layer dielectric Janus metasurface holograms utilizing TiO₂ meta-atoms, each capable of simultaneously operating under forward and backward illumination, thereby overcoming limitations raised in earlier studies. By incorporating the Dammann grating principle and precise phase manipulation, our design produces high-fidelity holographic images for arbitrary polarized light at a wavelength of 532 nm. This approach not only simplifies fabrication and minimizes losses but also broadens the applicability of holography, paving the way for diverse innovations in compact and versatile optical technologies.

摘要：雅努斯超穎介面已成為實現具方向性不對稱全像成像的重要技術平台。然而，現有設計常面臨多項限制，包括製程複雜、依賴空間多工或垂直堆疊結構、偏振態控制受限，或因顯著的歐姆損耗而難以在可見光波段運作。在本研究中，我們提出單層介電質雅努斯超穎介面全像片，採用二氧化鈦超穎原子，每個都能在正向與反向照明下同時運作，從而克服先前研究中的限制。透過結合德曼光柵原理與精確的相位操控，我們的設計能在 532 nm 波長下針對任意偏振光產生高保真度的全像影像。此方法不僅簡化了製程並降低了損耗，也拓展了全像技術的應用範疇，為微型化且多功能光學技術的多元創新鋪路。