Time-varying media, dispersion, and the principle of causality [Invited]

The article reviews general properties of time-varying dispersive materials. We first briefly discuss different dispersion models that have been proposed in the literature, the role of the causality principle, and the generalization of the Kramers-Kronig relations for the susceptibility of linear ti...

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Published in:Optical materials express 2024-05, Vol.14 (5), p.1222
Main Authors: Koutserimpas, Theodoros T., Monticone, Francesco
Format: Article
Language:English
Subjects:
Nonlinear optics
Photonic crystals
Principles
Time dependence
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description The article reviews general properties of time-varying dispersive materials. We first briefly discuss different dispersion models that have been proposed in the literature, the role of the causality principle, and the generalization of the Kramers-Kronig relations for the susceptibility of linear time-dependent media. Furthermore, we discuss the Kramers-Kronig-like relations for nonlinear optical processes, with a focus on those processes that may be used to realize strong and fast temporal modulations at optical frequencies to enable, for instance, photonic time-crystal phenomena.
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subjects Nonlinear optics
Photonic crystals
Principles
Time dependence
title Time-varying media, dispersion, and the principle of causality [Invited]
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