AI 中文总结
本文提出仅通过纯电调制金属响应的时空调制线介质，克服了传统方法需同时调制介电常数与磁导率的局限，实现了具有合成菲涅耳曳引效应的非互易双各向异性有效介质。
AI 中文摘要
电磁响应的时空调制为波操控提供了新机遇，这类系统尤其能在均匀化极限中模拟运动介质响应及相关菲涅耳曳引效应。现有方法需同时对介电常数和磁导率进行微观调制，实际中难以实现。本文表明，对金属响应进行调制可克服这一限制，仅通过纯电调制就能实现强类运动介质效应。本文以时空调制线介质为例，借助洛伦兹变换和准静态均匀化描述该机制，所得有效介质具有非互易性和双各向异性，支持显著的合成菲涅耳曳引效应。对于有限厚度平板，该响应会产生非互易散射，同时保持传播波的全局能量守恒。值得注意的是，合成菲涅耳曳引还会产生与速度相关的反射和透射古斯-汉欣位移，为有效运动提供直接特征。
英文摘要
Space-time modulations of the electromagnetic response offer new opportunities for wave control. In particular, such systems can emulate moving-medium responses and the associated Fresnel drag in the homogenization limit. Existing approaches require the simultaneous microscopic modulation of both permittivity and permeability, which is difficult to realize in practice. Here, we show that modulating a metallic response overcomes this limitation and enables strong moving-medium-like effects using purely electric modulation. We illustrate this mechanism with a space-time-modulated wire medium, described through Lorentz transformations and quasi-static homogenization. The resulting effective medium is nonreciprocal and bianisotropic and supports a pronounced synthetic Fresnel-drag effect. For a finite-thickness slab, this response leads to nonreciprocal scattering while preserving global energy conservation for propagating waves. Remarkably, the synthetic Fresnel drag also produces velocity-dependent reflection and transmission Goos-Hänchen shifts, providing a direct signature of the effective motion.
Comments44 pages
