Wu Xianfeng, Zheng Xinru, Xie Xin, Ji Ruonan, Song Kun, Zhao Xiaopeng
Opt Lett. 2024 Oct 1;49(19):5471-5474. doi: 10.1364/OL.537159.
Metasurfaces provide an unprecedented platform for precise and subwavelength-scale modulation of optical phases, leading to innovative advancements in wavefront shaping and holography devices. This study presents a single-layer umbrella-like metasurface capable of multichannel holography, encoded with both polarization and wavelength. By leveraging a unique chiral-assisted strategy, we achieve simultaneous decoupling of wavelength and spin states through single-parameter modulation. This approach circumvents the complex structure designs and multi-parameter adjustments typically required in previous methods. Numerical simulations confirm the effectiveness of this metasurface, demonstrating wavelength- and spin-decoupled phase modulation at 1550 and 980 nm. Furthermore, we successfully demonstrate a four-channel hologram operable in both transmission and reflection modes, showcasing the potential applications of this metasurface in compact functional integration, information encryption, and 3D displays. This work paves the way for the development of multifunctional optical devices with enhanced integration and performance.
超表面为光学相位的精确和亚波长尺度调制提供了一个前所未有的平台，推动了波前整形和全息器件的创新发展。本研究展示了一种能够实现多通道全息的单层伞状超表面，其编码方式为偏振和波长。通过利用独特的手性辅助策略，我们通过单参数调制实现了波长与自旋态的同时解耦。这种方法避免了以往方法通常所需的复杂结构设计和多参数调整。数值模拟证实了这种超表面的有效性，展示了在1550和980 nm处的波长和自旋解耦相位调制。此外，我们成功展示了一种可在透射和反射模式下工作的四通道全息图，展示了这种超表面在紧凑功能集成、信息加密和3D显示方面的潜在应用。这项工作为开发具有更高集成度和性能的多功能光学器件铺平了道路。
