article published yes Guocui Wang author René Geromel author Qunshuo Wei author Ruizhe Zhao author Xiaowei Li author Thomas Zentgraf author 305250000-0002-8662-1101 Lingling Huang author 15 department 230 department 289 department 623 department Janus metasurfaces have attracted considerable attention in encrypted communication, imaging, and display due to their unusual bidirectional asymmetric optical manipulation characteristics. Particularly, their multifunctionalization is of great significance for enhancing the compactness and integration of optical systems. However, the realization of multifunctional Janus metasurfaces in the optical band still faces enormous difficulties and challenges, which are essentially limited by the anti-error design and processing methods of multi-layer cascade metasurfaces. Here, a triple-layer Janus metasurface based on cascaded plasmonic nano-antenna arrays fully buried in SiO2 is constructed. Among them, the cascaded plasma nano-antenna consists of two types of enantiomers for each wavelength. Each enantiomer is fabricated with two layers of L-shaped nanostructures with phase modulation and one layer of dimer nanostructures with polarization selection stacked alternately along the optical axis. We experimentally show that the Janus metasurface achieves bidirectional asymmetric multi-channel holographic encryption, simultaneously using propagation direction, phase, polarization, and wavelength for the first time in the near-infrared band, which is expected to provide a frontier route for multifunctional optical displays, high-level optical information encryption, and large-capacity full-duplex communication. SPIE-Intl Soc Optical Eng2026 eng 2577-5421 2577-542110.1117/1.ap.8.5.056006 8051-11 Wang, Guocui, René Geromel, Qunshuo Wei, Ruizhe Zhao, Xiaowei Li, Thomas Zentgraf, and Lingling Huang. “Asymmetric Multi-Channel Holography by Cascaded Plasmonic Janus Metasurfaces.” <i>Advanced Photonics</i> 8, no. 05 (2026): 1–11. <a href="https://doi.org/10.1117/1.ap.8.5.056006">https://doi.org/10.1117/1.ap.8.5.056006</a>. G. Wang, R. Geromel, Q. Wei, R. Zhao, X. Li, T. Zentgraf, L. Huang, Advanced Photonics 8 (2026) 1–11. G. Wang <i>et al.</i>, “Asymmetric multi-channel holography by cascaded plasmonic Janus metasurfaces,” <i>Advanced Photonics</i>, vol. 8, no. 05, pp. 1–11, 2026, doi: <a href="https://doi.org/10.1117/1.ap.8.5.056006">10.1117/1.ap.8.5.056006</a>. Wang, G., Geromel, R., Wei, Q., Zhao, R., Li, X., Zentgraf, T., &#38; Huang, L. (2026). Asymmetric multi-channel holography by cascaded plasmonic Janus metasurfaces. <i>Advanced Photonics</i>, <i>8</i>(05), 1–11. <a href="https://doi.org/10.1117/1.ap.8.5.056006">https://doi.org/10.1117/1.ap.8.5.056006</a> @article{Wang_Geromel_Wei_Zhao_Li_Zentgraf_Huang_2026, title={Asymmetric multi-channel holography by cascaded plasmonic Janus metasurfaces}, volume={8}, DOI={<a href="https://doi.org/10.1117/1.ap.8.5.056006">10.1117/1.ap.8.5.056006</a>}, number={05}, journal={Advanced Photonics}, publisher={SPIE-Intl Soc Optical Eng}, author={Wang, Guocui and Geromel, René and Wei, Qunshuo and Zhao, Ruizhe and Li, Xiaowei and Zentgraf, Thomas and Huang, Lingling}, year={2026}, pages={1–11} } Wang G, Geromel R, Wei Q, et al. Asymmetric multi-channel holography by cascaded plasmonic Janus metasurfaces. <i>Advanced Photonics</i>. 2026;8(05):1-11. doi:<a href="https://doi.org/10.1117/1.ap.8.5.056006">10.1117/1.ap.8.5.056006</a> Wang, Guocui, et al. “Asymmetric Multi-Channel Holography by Cascaded Plasmonic Janus Metasurfaces.” <i>Advanced Photonics</i>, vol. 8, no. 05, SPIE-Intl Soc Optical Eng, 2026, pp. 1–11, doi:<a href="https://doi.org/10.1117/1.ap.8.5.056006">10.1117/1.ap.8.5.056006</a>. 668702026-08-31T05:44:11Z2026-08-31T05:48:43Z