Time-varying media have recently emerged as a new paradigm for wave manipulation, due to the synergy between the discovery of highly nonlinear materials, such as epsilon-near-zero materials, and the quest for wave applications, such as magnet-free nonreciprocity, multimode light shaping, and ultrafast switching. In this review, we provide a comprehensive discussion of the recent progress achieved with photonic metamaterials whose properties stem from their modulation in time. We review the basic concepts underpinning temporal switching and its relation with spatial scattering and deploy the resulting insight to review photonic time-crystals and their emergent research avenues, such as topological and non-Hermitian physics. We then extend our discussion to account for spatiotemporal modulation and its applications to nonreciprocity, synthetic motion, giant anisotropy, amplification, and many other effects. Finally, we conclude with a review of the most attractive experimental avenues recently demonstrated and provide a few perspectives on emerging trends for future implementations of time-modulation in photonics.

Emanuele Galiffi

Romain Tirole

Shixiong Yin

Huanan Li

Stefano Vezzoli

Paloma A. Huidobro

Mário G. Silveirinha

Riccardo Sapienza

Andrea Alù

J. B. Pendry

Advanced Photonics

Adv. Photon.

Photonics of time-varying media

时变介质的光子学

Category	Quartile
物理与天体物理	1
物理与天体物理, 光学	1

Photonics of time-varying media

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