Time-modulated metasurface waveguides enable multimode photonic time crystals with intramodal and tilted intermodal band gaps that support directional amplification and symmetry-based gap control.
Equation (10a) can be rewritten as: 𝑒−𝑗 √ 𝜔2 𝑁 𝜖0 𝜇0 −𝛽 2𝑑 0· · ·0 0𝑒 −𝑗 √︃ 𝜔2 𝑁−1 𝜖0 𝜇0 −𝛽 2𝑑 · · ·
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Multi-mode Photonic Time Crystals Based on Time-Modulated Metasurface Waveguides
Time-modulated metasurface waveguides enable multimode photonic time crystals with intramodal and tilted intermodal band gaps that support directional amplification and symmetry-based gap control.