Real-space observation of ultraslow light in photonic crystal waveguides

H Gersen, T J Karle, R J P Engelen, W Bogaerts, J P Korterik, N F van Hulst, T F Krauss, L Kuipers

Research output: Contribution to journalArticlepeer-review

482 Citations (Scopus)


We show the real-space observation of fast and slow pulses propagating inside a photonic crystal waveguide by time-resolved near-field scanning optical microscopy. Local phase and group velocities of modes are measured. For a specific optical frequency we observe a localized pattern associated with a flat band in the dispersion diagram. During at least 3 ps, movement of this field is hardly discernible: its group velocity would be at most c/1000. The huge trapping times without the use of a cavity reveal new perspectives for dispersion and time control within photonic crystals.

Original languageEnglish
Pages (from-to)073903
Number of pages4
JournalPhysical Review Letters
Issue number7
Publication statusPublished - 25 Feb 2005




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