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Observation of temporal Wood's anomaly in folded time gratings: surface-wave-enhanced transmission and the emergence of gain
Amit Shaham, Ben-Zion Joselson, Ilya Varenisov, Denis Dikarov, Ariel Epstein
https://arxiv.org/abs/2509.06029

Observation of temporal Wood's anomaly in folded time gratings: surface-wave-enhanced transmission and the emergence of gain
Wood's anomaly is a fundamental wave phenomenon that stems from the interplay between farfields and surface-wave (SW) resonances through structured interfaces. Recent theories have suggested temporal analogs of such SW coupling processes by employing frequency transitions via time-periodic interfaces, rather than classical wavevector (momentum) transitions via space-periodic gratings. In this paper, we observe this phenomenon experimentally by devising a folded time grating of a single, wavegui…