集成化太赫兹辐射器件和调控器件是太赫兹领域最重要的研究前沿之一，对推动太赫兹科学与技术的快速发展和实际应用有着重大前景。目前，由于受到方法和技术的限制，辐射和调控器件的研究通常分立进行。纳米超结构是光学领域最前沿的应用基础研究，主要用于调控可见和红外光波。由于尺度原因，通常无法直接用于太赫兹波辐射和调控。而光学频率非线性效应为建立两者之间的联系、突破当前的研究困境提供了一种有效途径。本项目旨在将太赫兹波辐射与调控过程通过纳米超结构的非线性效应实现有机结合，利用金属或全介质纳米超结构的可设计性，通过理论模型建立、仿真设计、样品制备、系统搭建和实验表征等手段，研究并实现新一代太赫兹功能器件，包括频谱、偏振和空间波前三大类辐射调控器件。通过系统分析太赫兹非线性辐射调控过程中的系列新现象和新效应，揭示其内在的物理机制和规律，建立相应的理论体系，获取从设计、制备、到实验表征的系列新方法和关键技术。

Integrated functional devices for terahertz generation and manipulation are frontiers in the terahertz research and of significant importance in advancing terahertz science and technology. Currently, integrated devices for terahertz generation and manipulation are implemented separately due to technical difficulties. As a cutting-edge fundamental applied research, nanoscale meta-geometries (NMGs) are primarily used to control the visible and infrared light waves. Owning to the scale barrier, it is not applicable to directly apply NMGs in terahertz generation and manipulation. Nonlinear optical effect, however, delivers a unique connection between these two areas, thus promising breakthroughs in the terahertz research. In this proposal, we aim to simultaneously generate and modulate the terahertz radiation via nonlinear effect in NMGs made from either metallic or dielectric media. By fully taking advantages of the designable properties of NMGs, we will develop a new generation of functional terahertz devices, including spectral, polarization and wavefront manipulation devices, through theoretical modeling, numerical simulation and design, nanoelectronic fabrication, system development, and experimental characterization. By systematically analyzing new phenomena and new effects observed in the nonlinear process in NGMs, we will achieve in-depth understanding of the physical mechanisms, develop corresponding theory, achieve systematic new methods and key technologies in the design, fabrication and experimental characterization.