T. Sünner, M. Gellner, A. Löffler, M. Kamp, and A. Forchel, "Group Delay Measurements of High Quality GaAs Photonic Crystal Cavities,"
in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference and Photonic Applications Systems Technologies,
OSA Technical Digest Series (CD)
(Optical Society of America, 2007), paper CThG6.
The group delay of light propagating through photonic crystal cavities was measured by the phase shift technique. The largest observed group delay was 132 ps for a cavity with a quality factor of 82 000.