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

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.

Ultrafast phenomena and terahertz waves: introduction

“…The propagation of femtosecond pulses in photonic crystals is associated with these linear dispersion properties and some nonlinear effects. Shi et al investigate theoretically and numerically ultrafast dynamic nonlinear phenomena and mechanisms in photonic crystal over photonic gap and band regions, which can be useful in designing new ultrafast all-optical devices [3].…”