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arXiv 2008.04304physics.opticsphysics.app-ph
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线性时变介质中Kramers-Kronig关系的推广

A Generalization of the Kramers-Kronig Relations for Linear Time-Varying Media

Diego M. Solís, Nader Engheta

摘要:

我们探索的数学理论,严格地描述与线性时变,一般色散,电磁本构参数的介质的响应。我们表明,即使当时间的不均匀性发生在一个时间尺度可比或短于驱动场的时间周期,人们仍然可以定义一个物理意义上的时变色散。因此,一组广义的Kramers-Kronig关系的调查链接的实部和虚部的时变频率色散谱表征介质的本构响应。除其他外,我们研究的情况下的洛伦兹介电响应随时间变化的体积密度的可极化原子,并提出了不同的电路等效的控制微分方程,这反过来又允许我们使用的概念,广义随时间变化的阻抗/导纳的随时间变化的电阻器,电感器和电容器。

英文摘要:

We explore the mathematical theory to rigorously describe the response of media with linear time-varying, generally dispersive, electromagnetic constitutive parameters. We show that even when the temporal inhomogeneity takes place on a time scale comparable or shorter than the driving fields' time period, one can still define a physically meaningful time-varying dispersion. Accordingly, a generalized set of Kramers-Kronig relations is investigated to link the real and imaginary parts of the time-varying frequency-dispersive spectra characterizing the medium's constitutive response. Among others, we study the case of a Lorentzian dielectric response with time-varying volumetric density of polarizable atoms and present the varying circuital equivalents of the governing differential equation, which in turn allow us to use the notion of generalized time-varying impedances/admittances of a time-dependent resistor, inductor and capacitor.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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