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Robust and Integrable Time-Varying Metamaterials: A Systematic Survey and Coherent Mapping.

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Temporal metamaterials modulate electromagnetic parameters over time, enabling advanced wave-matter interactions. This survey unifies research on these dynamic materials for applications like nonreciprocity and frequency conversion.

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Area of Science:

  • Electromagnetism and Materials Science
  • Photonics and Wave Phenomena

Background:

  • Metamaterials and metasurfaces offer unique wave-matter interactions by engineering electromagnetic parameters.
  • Static metamaterials have limitations in controlling energy and momentum exchange with fields.

Purpose of the Study:

  • To provide a unified framework for theoretical and experimental developments in time-varying metamaterials.
  • To compare different methods of temporal modulation and their applications.
  • To outline challenges and future directions for temporal metasurfaces.

Main Methods:

  • Systematic comparison of time-varying permittivity, permittivity-permeability modulation, conductivity, plasmas, and circuit-equivalent implementations.
  • Analysis of stochastic and rapidly sign-switching regimes.
  • Relating electromagnetic temporal metasurfaces to acoustic and quantum analogs using common figures of merit.

Main Results:

  • Time-varying metamaterials enable magnet-free nonreciprocity, low-loss frequency conversion, and advanced impedance matching.
  • Demonstrations include temporal photonic crystals and non-Foster temporal boundaries.
  • Various modulation techniques and their performance metrics are systematically compared.

Conclusions:

  • Significant progress has been made in understanding and demonstrating temporal metamaterials.
  • Key challenges remain in loss reduction, pump efficiency, high-speed nanoscale modulation, and broadband operation.
  • Robust and integrable temporal metasurfaces require addressing these challenges and establishing fair benchmarking.