We demonstrated a tunable temporal gap based on simultaneous fast and slowlight in electro-optic photonic crystals. The light experiences an anomalousdispersion near the transmission center and a normal dispersion away from thecenter, where it can be accelerated and slowed down, respectively. We alsoobtained the switch between fast and slow light by adjusting the externalelectric filed. The observed largest temporal gap is 541 ps, which is crucialin practical event operation inside the gap. The results offer a new solutionfor temporal cloak.
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