Broadband Dipole Absorption in Dispersive Photonic Time Crystals

Allard, Thomas F.; Sustaeta-Osuna, Jaime E.; García-Vidal, Francisco J.; Huidobro, Paloma A.

doi:10.1103/gttv-6lqc

articlePhysical Review LettersFeb 2, 2026HYBRID OA

Broadband Dipole Absorption in Dispersive Photonic Time Crystals

TFThomas F. Allard JEJaime E. Sustaeta-Osuna FJFrancisco J. García-Vidal PAPaloma A. Huidobro

Universidad Autónoma de Madrid

PubMed

Indexed inarxivcrossrefpubmed

Abstract

Photonic media modulated periodically in time, termed photonic time crystals (PTCs), have attracted considerable attention for their ability to open momentum bandgaps hosting amplifying modes. These momentum gaps, however, generally appear only at the system's parametric resonance condition which constrain many features derived from amplification to a narrow frequency band. Moreover, they are accompanied by exceptional points (EPs) and may drive the system into an instability, which renders their analysis more intricate. Here, we show that a careful consideration of dispersion and absorption can overcome these issues. By investigating the dissipated power of a point-dipole embedded in a dispersive and…

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Keywords

Broadband
Absorption (acoustics)
Photonic crystal
Dipole
Photonics
Dispersion (optics)
Absorption spectroscopy

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