时域有限差分法
太赫兹辐射
时域
非线性系统
多物理
频域
麦克斯韦方程组
理论(学习稳定性)
物理
有限差分
有限差分法
数学分析
算法
计算物理学
计算机科学
数学
光学
有限元法
量子力学
机器学习
计算机视觉
热力学
作者
Ming Fang,Jian Feng,Guoda Xie,Yongchang Lu,Xueqian Zhang,Jiaguang Han,Zhixiang Huang
出处
期刊:IEEE Transactions on Microwave Theory and Techniques
日期:2023-08-01
卷期号:71 (8): 3379-3391
被引量:3
标识
DOI:10.1109/tmtt.2023.3276448
摘要
Difference frequency generation (DFG) is an essential phenomenon for generating far-infrared (FIR) and broadband terahertz (THz) waves, which cannot be generated by either alternating current flow-driven antennas for microwave source or pumped materials for higher frequency lights. Metallic nonlinear metasurfaces (NLMSs) as a new platform for generating THz sources were intensively developed. In this work, a nondepleted time-domain model derived from the Maxwell-hydrodynamic model is proposed where linear and nonlinear responses in metallic structures under an intense excitation are separated. By using the proposed model, only linear and low-frequency DFG signals will be considered, which makes this model suitable for unconditionally stable time-domain algorithms. A finite-difference time-domain (FDTD) method is employed to solve a set of multiphysics equations based on the proposed model. The stability of the algorithm is apparent. We validate our method by simulating THz generations from metallic NLMSs and benchmark the approach with previous numerical studies as well as our recent experimental results. In addition, the implementation of solving the DFG response can be remarkably accelerated by using the unconditionally stable algorithm.
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