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Authors: H. Gersen, T.J. Karle, R.J.P. Engelen, W. Bogaerts, J.P. Korterik, N.F. van Hulst, T.F. Krauss, L. Kuipers
Title: Real space observation of ultraslow light in photonic crystal waveguides.
Format: International Journal
Publication date: 2/2005
Journal/Conference/Book: Physics Review Letters
Volume(Issue): 94(7) p.073903
DOI: 10.1103/physrevlett.94.073903
Citations: 433 ( - last update: 9/6/2024)
309 (OpenCitations - last update: 3/5/2024)
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We show the real space observation of fast and slow pulses propagating inside a photonic crys-
tal waveguide by time-resolved Near-¯eld Scanning Optical Microscopy. Local phase and group
velocities of modes are measured. For a speci¯c optical frequency we observe a localized pattern
associated with a °at band in the dispersion diagram. During at least 3 ps movement of this ¯eld is
hardly discernable: 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.

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