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Holding and amplifying electromagnetic waves with temporal non-foster metastructures

Author

Listed:
  • Victor Pacheco-Peña

    (Newcastle University)

  • Yasaman Kiasat

    (University of Pennsylvania
    580 Market Street)

  • Diego M. Solís

    (University of Pennsylvania
    University of Extremadura)

  • Brian Edwards

    (University of Pennsylvania)

  • Nader Engheta

    (University of Pennsylvania)

Abstract

We introduce a mechanism that can both hold and amplify electromagnetic waves by rapidly changing the permittivity of the medium during the wave travel from a positive to a dispersionless (i.e. non-Foster) negative value and then back again. The underlying physics behind this phenomenon is theoretically explored by considering plane wave and Gaussian pulse propagation in an unbounded medium. Interestingly, we show that a rapid positive-to-negative temporal change of ε(t) causes the propagation of the wave to stop (observed by a frozen phase in time) while the amplitude of the frozen field exponentially grows. Stepping the permittivity back to the original (or a new) positive value will cause the wave to thaw and resume propagation with the original (or the new) frequency, respectively. We numerically study the case of dipole radiation in such time-varying non-Foster structures. As a possible implementation, we propose a parallel plate waveguide platform loaded with time-dependent media emulating parallel lumped non-Foster negative capacitors. Such non-Foster time-varying structures may open new venues in controlling and manipulating wave-matter interaction.

Suggested Citation

  • Victor Pacheco-Peña & Yasaman Kiasat & Diego M. Solís & Brian Edwards & Nader Engheta, 2025. "Holding and amplifying electromagnetic waves with temporal non-foster metastructures," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57739-0
    DOI: 10.1038/s41467-025-57739-0
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    References listed on IDEAS

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    1. Lene Vestergaard Hau & S. E. Harris & Zachary Dutton & Cyrus H. Behroozi, 1999. "Light speed reduction to 17 metres per second in an ultracold atomic gas," Nature, Nature, vol. 397(6720), pages 594-598, February.
    2. Diederik S. Wiersma & Paolo Bartolini & Ad Lagendijk & Roberto Righini, 1997. "Localization of light in a disordered medium," Nature, Nature, vol. 390(6661), pages 671-673, December.
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