Ultrafast Tilting of the Dispersion of a Photonic Crystal and Adiabatic Spectral Compression of Light Pulses

Daryl M. Beggs*, Thomas F. Krauss, L. Kuipers, Tobias Kampfrath

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

37 Citations (Scopus)


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.

Original languageEnglish
Article number033902
Number of pages5
JournalPhysical Review Letters
Issue number3
Publication statusPublished - 18 Jan 2012



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