强场太赫兹诱导超构材料实现非线性调控的机理及器件研究

Nonlinear control and manipulation of terahertz waves are very important for investigation of strong-field terahertz radiation and matters interaction, terahertz spectroscopy, imaging and wireless communications. However, related researches are lagged due to severe lack of efficient sources and appropriate materials. In this proposal, we are going to systematically study the strong-field terahertz radiation induced nonlinear phenomena in nanogap-metamaterials, employing the extremely high local field enhancement and the sharp and sensitive resonances functions. To this end, we are going to choose different substrate materials, different doping level, and carefully engineering the structures to deepen the understanding of intense terahertz induced carrier dynamics, to clarify the physical mechanisms of terahertz nonlinearity in metamaterials, and to explore new theory and new technology for nonlinear terahertz metamaterials. Consequently, through the experimental and theoretical research in this proposal, we aim to develop a strong terahertz self-modulation scheme and devices. By combining external electrical control with strong terahertz self-modulation, we hope to realize programmable nonlinear terahertz devices.

强场太赫兹与物质相互作用物理以及太赫兹谱学成像和无线通信等应用需要对太赫兹脉冲进行非线性光场调控。由于强源和材料的缺乏，相关研究进展缓慢。本项目拟采用工作在太赫兹频段的纳米开口超构材料对太赫兹场极强的局域场增强能力和高灵敏度的共振探测能力，系统地研究不同衬底材料、衬底掺杂浓度、超构材料的结构参数等对强太赫兹辐射的非线性调控规律及物理机理，加深对强场太赫兹半导体载流子动力学的理解，探索非线性太赫兹调控的新理论和新技术。通过本项目系统的实验和理论研究，力争研制出强太赫兹自调控方案及器件，通过结合外部电学调控和强太赫兹自调控的复合调控手段，获得可编程的非线性调控器件。

强场太赫兹与物质相互作用物理以及太赫兹谱学成像和无线通信等应用需要对太赫兹脉冲进行非线性光场调控。由于强源和材料的缺乏，相关研究进展缓慢。本项目采用工作在太赫兹频段的纳米开口超构材料对太赫兹场极强的局域场增强能力和高灵敏度的共振探测能力，系统地研究不同衬底材料、衬底掺杂浓度、超构材料的结构参数等对强太赫兹辐射的非线性调控规律及物理机理，加深对强场太赫兹半导体载流子动力学的理解，探索非线性太赫兹调控的新理论和新技术。通过本项目系统的实验和理论研究，研制了强太赫兹自调控方案及器件，获得了对强太赫兹波出射方向可调控的器件。