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Full Hydrodynamic Model of Nonlinear Electromagnetic Response in Metallic Metamaterials (Invited Paper)

By Ming Fang, Zhi-Xiang Huang, Wei E. I. Sha, Xiaoyan Y. Z. Xiong, and Xian-Liang Wu
Progress In Electromagnetics Research, Vol. 157, 63-78, 2016


Applications of metallic metamaterials have generated significant interest in recent years. Electromagnetic behavior of metamaterials in the optical range is usually characterized by a local-linear response. In this article, we develop a finite-difference time-domain (FDTD) solution of the hydrodynamic model that describes a free electron gas in metals. Extending beyond the local-linear response, the hydrodynamic model enables numerical investigation of nonlocal and nonlinear interactions between electromagnetic waves and metallic metamaterials. By explicitly imposing the current continuity constraint, the proposed model is solved in a self-consistent manner. Charge, energy and angular momentum conservation laws of high-order harmonic generation have been demonstrated for the first time by the Maxwell-hydrodynamic FDTD model. The model yields nonlinear optical responses for complex metallic metamaterials irradiated by a variety of waveforms. Consequently, the multiphysics model opens up unique opportunities for characterizing and designing nonlinear nano devices.


Ming Fang, Zhi-Xiang Huang, Wei E. I. Sha, Xiaoyan Y. Z. Xiong, and Xian-Liang Wu, "Full Hydrodynamic Model of Nonlinear Electromagnetic Response in Metallic Metamaterials (Invited Paper)," Progress In Electromagnetics Research, Vol. 157, 63-78, 2016.


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