非线性纳米光子芯片空间接口：通过非线性切连科夫辐射在芯片上生成结构化、拓扑和时空光
Nonlinear Nanophotonic Chip-space Interfaces: On-chip Generation of Structured, Topological and Spatiotemporal Lights Via Nonlinear Čerenkov Radiation
AI总结：
通过非线性切连科夫辐射在芯片上生成结构化、拓扑和时空光，实现多维非线性光学工程。
摘要：
微型化和可重新配置的接口，用于在集成光子芯片内的受限光学模式与在自由空间中传播的结构化光之间，将成为基础光学科学和现代光子技术的基石。在本工作中，我们利用与薄层铌酸锂相关的各向异性非线性电滞张量，构建了能够通过向芯片波导注入光子灵活生成和多维工程化结构化光的纳米光子芯片空间接口。通过利用集成非线性微环谐振器中的非线性切连科夫辐射，我们成功地定制了结构化光涡流的空间轮廓、偏振状态、发射波长、拓扑电荷和时间波包，表现出远超现有水平的可重新配置性和调节范围。为进一步展示我们平台的能力，我们使用单个泵浦源，在可见范围内通过自旋-轨道耦合和多态集成涡旋微梳的协同作用，生成可调谐的光学Skyrmions。我们的工作连接了结构化光和集成非线性光学研究领域，为时空光生成和芯片上多维非线性光学提供了前所未有的机会。
英文摘要：
Miniaturized and reconfigurable interfaces between confined optical modes within integrated photonic chips and structured light propagating in free space would serve as a cornerstone for fundamental optical science and modern photonic technology. In this work, we exploit the anisotropic nonlinear susceptibility tensors associated with thin-film lithium niobate to construct nanophotonic chip-space interfaces capable of flexibly generating and multi-dimensionally engineering structured light via injections of photons to on-chip waveguides. By harnessing the nonlinear Čerenkov radiation in integrated nonlinear microring resonators, we successfully tailor the spatial profile, polarization state, emission wavelength, topological charge and temporal wave packet of structured optical vortices, exhibiting reconfigurabilities and tuning ranges far beyond the state-of-the-art. To further showcase the capabilities of our platform, we use a single pump to generate tunable optical skyrmions via the spin-orbit coupling and multi-state integrated vortex microcombs in the visible range via synergistic $χ^{(2)}$ and $χ^{(3)}$ nonlinear optical processes. Our work bridges the research fields of structured light and integrated nonlinear optics, providing unprecedented opportunities for spatiotemporal light generation and on-chip multidimensional nonlinear optics.
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