Fang Bin, Li Yantao, Lei Yu, Cao Jiaqi, Shu Fangzhou, Zhao Tianqi, Zhou Shenghua, Jin Zhongwei, Shen Changyu, Hong Zhi, Zhan Chunlian, Li Lin
Opt Express. 2025 Jan 27;33(2):3112-3122. doi: 10.1364/OE.547396.
Metasurfaces consisting of subwavelength structures have shown unparalleled capability in light field manipulation. However, their functionalities are typically static after fabrication, limiting their practical applications. Though persistent efforts have led to dynamic wavefront control with various materials and mechanisms, most of them work in free space and require specialized materials or bulky configurations for external control. This deviates from the original intention of metasurface to realize compact and integrated devices. Here, we leverage the on-chip geometric metasurface associated with polarization reconfiguration of the guided wave, enabling three functions simultaneously: guided wave radiation, polarization multiplexing, and dynamic wavefront manipulation. We demonstrate proof-of-principle functionalities, including intensity-continuously tunable multifocal metalens, and dynamic zoom metalens as well as dynamic holography, based on a metasurface dressed lithium-niobate-on-insulator waveguide. Such an integrated platform for dynamic wavefront shaping implies the prospect of advancements in chip-integrated multifunctional meta-devices.
由亚波长结构组成的超表面在光场操纵方面展现出了无与伦比的能力。然而，它们的功能在制造后通常是静态的，这限制了它们的实际应用。尽管经过持续努力已实现了利用各种材料和机制进行动态波前控制，但其中大多数在自由空间中工作，并且需要特殊材料或庞大的配置来进行外部控制。这背离了超表面实现紧凑和集成器件的初衷。在此，我们利用与导波偏振重新配置相关的片上几何超表面，同时实现三项功能：导波辐射、偏振复用和动态波前操纵。我们基于一种覆盖在绝缘体上铌酸锂波导上的超表面，展示了原理验证功能，包括强度连续可调的多焦点金属透镜、动态变焦金属透镜以及动态全息术。这种用于动态波前整形的集成平台意味着芯片集成多功能超器件取得进展的前景。
