非线性超构材料是当今纳米光子学的研究热点，本项目围绕其中的一些新的科学问题，主要研究超构材料中结构单元的谐波偏振调控特性，结合超构材料中的相位梯度，设计能产生任意偏振态的非线性微纳光子器件；发展基于非线性超构材料的全息成像的新原理、新方法，构建具有波长、偏振以及自旋复用功能的非线性全息光学器件；研究柔性衬底形变导致的结构单元的形状改变以及超构材料周期变化对谐波波前和谐波偏振的影响，构建基于柔性衬底的具有对谐波分束、光束偏转、聚焦等动态调控功能的非线性超构材料；发展非线性超构材料高速动态调控的新原理、新方法，结合光学性质受外电场或光场调控的介电材料，实现谐波波前、谐波偏振可实时调控的非线性超构材料和非线性微纳光子器件，并探索其在全息图像动态可调的非线性全息光学器件上的应用，为后续应用研究提供可靠的科学依据和技术支撑。

Nonlinear metamaterials has been one of today’s hottest research subjects in the field of nano-photonics. In this project, we mainly focus on several new scientific problems emerging in the field of nonlinear metamaterials. We plan to study the polarization of the harmonic generation from the constituents, and design the nonlinear micro/nano optical devices that can generate the arbitrary polarization states with the aid of the phase gradient in the metamaterials. We will develop new methods for nonlinear metamaterials based holograms, and construct wavelength, polarization and spin multiplexed nonlinear metasurface holography. We will study the effect of the deformation induced shape change of the constituents and period change of the metamaterials on the wavefront and polarization of the harmonic wave, and construct flexible substrate based nonlinear metamaterials with dynamically tunable functions such as harmonic wave splitting, harmonic wave deflection, and focusing. We will also develop new mechanisms that can be exploited to dynamically tune the optical properties of the nonlinear metamaterials. By introducing the dielectrics with optical properties that are capable of being tuned under external electric fields or optical fields into metamaterials, we will design the nonlinear metamaterials and nonlinear micro/nano devices which allow real-time manipulations of the wave front and polarization of the harmonic waves. Furthermore, we will try to use the proposed dynamically tunable nonlinear metamaterials to realize the nonlinear holographic optical devices that can provide dynamic holographic images. We hope the implementation of this project can provide reliable scientific basis and technical support for the future application researches.