Zeyang Liu, Hao Gao, Taigao Ma, Vishva Ray, Niu Liu, Xinliang Zhang, L. Jay Guo, Cheng Zhang
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Here, we present a new type of waveguide-based multi-channel metaholograms, which support six independent and fully crosstalk-free holographic display channels, simultaneously multiplexed by the spin and angle of guided incident light within the glass waveguide. We employ a k-space translation strategy that allows each of the six distinct target images to be selectively translated from evanescent-wave region to the center of propagation-wave region and projected into free space without crosstalk, when the metahologram is under illumination of a guided light with specific spin and azimuthal angle. In addition, by tailoring the encoded target images, we implement a three-channel polarization-independent metahologram and a two-channel full-color (RGB) metahologram. Moreover, the number of multiplexing channels can be further increased by expanding the k-space’s central-period region or combing the k-space translation strategy with other multiplexing techniques such as orbital angular momentum multiplexing. Our work provides a novel approach towards realization of high-performance and compact holographic optical elements with substantial information capacity, opening avenues for applications in AR/VR displays, image encryption, and information storage.","PeriodicalId":72891,"journal":{"name":"eLight","volume":null,"pages":null},"PeriodicalIF":27.2000,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Broadband spin and angle co-multiplexed waveguide-based metasurface for six-channel crosstalk-free holographic projection\",\"authors\":\"Zeyang Liu, Hao Gao, Taigao Ma, Vishva Ray, Niu Liu, Xinliang Zhang, L. 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引用次数: 0
摘要
基于超表面的全息图(或称超全息图)具有独特的优势,包括成像质量提高、视野扩大、系统尺寸紧凑以及操作带宽宽广。多通道元全息图能够根据偏振状态和入射角度等照明光的特性在多个投影图像之间切换,是实现可切换动态全息显示的理想解决方案。然而,现有的设计通常面临复用通道有限和不必要的串扰等挑战,严重制约了其实际应用。在这里,我们提出了一种基于波导的新型多通道元全息图,它支持六个独立且完全无串扰的全息显示通道,同时通过玻璃波导内引导入射光的自旋和角度进行多路复用。我们采用了一种 k 空间平移策略,当元全息图在具有特定自旋和方位角的引导光照射下时,六种不同目标图像中的每一种都能有选择地从渐变波区域平移到传播波区域的中心,并投射到自由空间而不会发生串扰。此外,通过定制编码目标图像,我们实现了三通道偏振无关元全息图和双通道全彩(RGB)元全息图。此外,通过扩大 k 空间的中心周期区域或将 k 空间平移策略与轨道角动量复用等其他复用技术相结合,还可以进一步增加复用通道的数量。我们的研究为实现具有强大信息容量的高性能紧凑型全息光学元件提供了一种新方法,为 AR/VR 显示、图像加密和信息存储等应用开辟了道路。
Broadband spin and angle co-multiplexed waveguide-based metasurface for six-channel crosstalk-free holographic projection
Metasurface-based holograms, or metaholograms, offer unique advantages including enhanced imaging quality, expanded field of view, compact system size, and broad operational bandwidth. Multi-channel metaholograms, capable of switching between multiple projected images based on the properties of illuminating light such as state of polarization and angle of incidence, have emerged as a promising solution for realizing switchable and dynamic holographic displays. Yet, existing designs typically grapple with challenges such as limited multiplexing channels and unwanted crosstalk, which severely constrain their practical use. Here, we present a new type of waveguide-based multi-channel metaholograms, which support six independent and fully crosstalk-free holographic display channels, simultaneously multiplexed by the spin and angle of guided incident light within the glass waveguide. We employ a k-space translation strategy that allows each of the six distinct target images to be selectively translated from evanescent-wave region to the center of propagation-wave region and projected into free space without crosstalk, when the metahologram is under illumination of a guided light with specific spin and azimuthal angle. In addition, by tailoring the encoded target images, we implement a three-channel polarization-independent metahologram and a two-channel full-color (RGB) metahologram. Moreover, the number of multiplexing channels can be further increased by expanding the k-space’s central-period region or combing the k-space translation strategy with other multiplexing techniques such as orbital angular momentum multiplexing. Our work provides a novel approach towards realization of high-performance and compact holographic optical elements with substantial information capacity, opening avenues for applications in AR/VR displays, image encryption, and information storage.