作为集成光子学体系的源头，集成、高效且可以多维度调控的非线性光源是国内外研究者关注的重点。本项目拟结合超构表面对光场强调控能力和微纳共振单元体系的非线性效应，发展超构表面中非线性谐波产生效率增强的新机制，实现高效非线性光源；结合具有光、电调控特性的材料，实现对非线性光源的光场幅度、相位、偏振等多维度的实时动态调控。研究基于高效非线性超构表面的自发参量下转换过程，获得微纳尺度下的量子纠缠光源，通过优化设计超构表面实现对纠缠光源相位，偏振和路径等维度的调控。研究基于超构表面阵列的大规模量子纠缠光源阵列，实现空间相位编码的、分立的高维（8×8=64维）量子集成光源，探索其在量子照明和超衍射极限的量子成像等量子效应中的应用。希望通过本项目的研究，实现基于超构表面的高效非线性光源、高维量子纠缠光源阵列，取得具有自主知识产权研究成果，为后续应用研究提供可靠的科学依据和技术支撑。

Integrated photonics devices have been one of today’s hot topics in the field of photonics. Recently, as the source of integrated photonic system, highly efficient and integrated nonlinear light sources with multi-dimensional tunability have attracted increasing attention. In this project, we plan to combine the powerful ability of the metasurface to manipulate the optical field and the high nonlinearity of the micro/nano resonant building blocks, and achieve highly efficient metasurface based nonlinear light source by developing new mechanisms for enhancing the efficiency of harmonic generation from metal, metal-dielectric and dielectric nonlinear metasurfaces. We expect to achieve the manipulation and full-control of the amplitude, phase, and polarization state of the harmonic fields using well-designed metasurfaces. We will also develop new methods and principles for design of metasurfaces with high-speed dynamic tunability. By integrating the dielectrics with optical properties that are capable of being tuned under external electric fields or optical fields into metasurfaces, we will design the nonlinear metasurfaces which allow real-time multi-dimensional manipulation of nonlinear optical fields. We will study the spontaneous parametric down-conversion processes in the highly efficient nonlinear metasurfaces, provide micro/nano quantum entangled light sources, and realize the multi-dimensional manipulation of phase, polarization and path of the quantum entangled light sources with optimally designed metasurfaces. We will also design large-scale quantum entangled light source array based on the array of metasurfaces, try to achieve discrete and spatial phase-encoded quantum integrated sources with high, for example, 8*8 dimensions, and find their applications in the quantum illumination and super-resolution quantum imaging. We hope the implementation of this project can provide reliable scientific basis and technical support for the future application researches.