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PreprintCC0arXiv

Temporal chirality in Floquet photonic media

  • Rui-Chuan Zhang
  • Yixin Sha
  • Yi Yang
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Abstract

We reveal temporal chirality in time-modulated photonic media: reversing the orientation of a closed loop traced by the complex permittivity can leave the Floquet spectrum unchanged while strongly modifying the directional scattering response under the same excitation. This behavior is linked to two symmetry constraints on the evolution operator, namely pseudo-Hermiticity and pseudo-unitarity. We prove the general occurrence of temporal chirality based on a complex Bogoliubov parametrization of the scattering amplitudes. We illustrate these findings in a single-harmonic temporal-𝒫𝒯-symmetric system: both modulation-loop orientations support the same vacuum-like Floquet photonic bands at the phase transition, but one suppresses backward photon generation whereas the other induces strong growth, as confirmed by full-wave simulations. Our results establish temporal chirality as a distinct notion in time-varying photonics and identify modulation-loop orientation as a control knob for Floquet wave dynamics.

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Cite

BibTeXRIS
BibTeX
@misc{zhang2026temporal,
  title = {{Temporal chirality in Floquet photonic media}},
  author = {Rui-Chuan Zhang and Yixin Sha and Yi Yang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.11940},
  eprint = {2610.11940},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.11940},
  note = {CC0},
}
RIS
TY  - UNPB
TI  - Temporal chirality in Floquet photonic media
AU  - Rui-Chuan Zhang
AU  - Yixin Sha
AU  - Yi Yang
PY  - 2026
DA  - 2026/10/08
PB  - arXiv
DO  - 10.48550/arxiv.2610.11940
UR  - https://arxiv.org/abs/2610.11940
AB  - We reveal temporal chirality in time-modulated photonic media: reversing the orientation of a closed loop traced by the complex permittivity can leave the Floquet spectrum unchanged while strongly modifying the directional scattering response under the same excitation. This behavior is linked to two symmetry constraints on the evolution operator, namely pseudo-Hermiticity and pseudo-unitarity. We prove the general occurrence of temporal chirality based on a complex Bogoliubov parametrization of the scattering amplitudes. We illustrate these findings in a single-harmonic temporal-𝒫𝒯-symmetric system: both modulation-loop orientations support the same vacuum-like Floquet photonic bands at the phase transition, but one suppresses backward photon generation whereas the other induces strong growth, as confirmed by full-wave simulations. Our results establish temporal chirality as a distinct notion in time-varying photonics and identify modulation-loop orientation as a control knob for Floquet wave dynamics.
ER  -