Ultrafast tilting of the dispersion of a photonic crystal and adiabatic spectral compression of light pulses

Abstract

We demonstrate, by theory and experiment, the ultrafast tilting of the dispersion curve of a photonic-crystal waveguide following the absorption of a femtosecond pump pulse. By shaping the pump-beam cross section with a nanometric shadow mask, different waveguide eigenmodes acquire different spatial overlap with the perturbing pump, leading to a local flattening of the dispersion by up to 11 %. We find that such partial mode perturbation can be used to adiabatically compress the spectrum of a light pulse traveling through the waveguide.

References in corpus (3)

• Stopping Light All-Optically
• Dynamics of light propagation in spatiotemporal dielectric structures
• Dynamic release of trapped light from an ultrahigh-Q nanocavity via adiabatic frequency tuning

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