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Ultrafast dynamic nonlinear phenomena and mechanisms of photonic crystals over photonic gap and band regions

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Abstract

We systematically investigate ultrafast dynamic nonlinear mechanisms of photonic crystals (PhCs) with femtosecond (fs) pumping via the transmission change of a signal pulse. The pumping causes a nonlinear decrease (or increase) in the dielectric constant of the PhC material. A new phenomenon of the asymmetric change in the transmission spectra was observed in the gap region and the band-gap edge modes. For the band region, a sloped change in the transmission spectra was observed, and for the transition region, a hybrid of the two was observed. In addition, a universal dynamic picture of the fs nonlinear responses of the PhC was constructed.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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