特异表面中双结构单元的电磁波调控特性研究

Benefit from the ultrathin and subwavelength manipulation characteristics, metasurfaces have much application potential at electromagnetic wave propagation regions. In most of the demonstrations, however, one microstructure of metasurface usually calculated as one pixel, which cannot completely controlling the amplitude and phase, respectively, with the limitation of polarization and geometric parameters. Here twin microstructure unit pave a new flexibility in light manipulation, by adjusting the phase difference of two responding vectors, generated by two adjacent microstructure antennas, the coherent superposition will show different amplitude and phase values, that is the completely controlling of light. Considering the size of antenna and whose unregularly relative structures, unexpected coupling will destroy the unit coherent superposition theory. Our study will focus on the manipulation properties of geometric parameters, styles and components of responding. Which include the design of non-coupling antennas, relationship of composited properties and manipulation parameters, coherent superposition characteristics under the condition of two different responding styles and whose new application, and polarization manipulation caused by responding components. More recently, metasurface have been applied in imaging, optical Hall effect, mathematical operation, vortex beams, quantum effect of angular and orbit momentum, which all have the amplitude and phase potential requirements. In those applications, our study results will provide more important theoretical and experimental basis.

超薄和亚波长响应特性使得特异表面具有任意调控电磁波的潜力，但现有单结构统计方法受入射偏振态和微结构几何参数调节范围因素影响，还不能完全连续控制电磁波的振幅和相位。本项目拟用双结构单元增加调控自由度，利用相位差调控相干叠加后的振幅和相位，实现普遍情况下的电磁波定量调控。重点研究微结构参数、共振方式和响应分量对双结构单元复合响应的调控机制，包括无耦合结构单元的设计、复合特性调控参数关系的确定、不同共振机制的相干叠加机理和灵活特性归纳总结、各响应分量之间的相位差调节导致的偏振调控规律，以及相关的新物理特性。拟解决亚波长尺度下完全调控振幅和相位的物理机制、多种响应形式的复合调控特性规律、响应分量的调控方法和灵活特性验证三个关键科学问题。掌握电磁波的定量调控方法，将会有效解决特异表面在成像、涡旋光束、光量子效应等领域中对振幅和相位调控的需求问题，为进一步应用提供重要的理论依据。

超薄和亚波长响应特性使得特异表面具有任意调控电磁波的潜力，但现有单结构统计方法受入射偏振态和微结构几何参数调节范围因素影响，还不能完全连续控制电磁波的振幅和相位。本项目用双结构单元增加调控自由度，利用相位差调控相干叠加后的振幅和相位，实现普遍情况下的电磁波定量调控。重点研究了微结构参数、共振方式和响应分量对双结构单元复合响应的调控机制，设计了不同共振机制的相干叠加机理应用器件，掌握电磁波的定量调控方法，有效解决了特异表面在成像、涡旋光束、光量子效应等领域中对振幅和相位调控的需求问题，为进一步应用提供重要的理论依据。