Photonic bands and group-velocity dispersion in Si/SiO2 photonic crystals from white-light interferometry

Details Photonic bands and group-velocity dispersion in Si/SiO2 photonic crystals from white-light interferometry Photonic bands and group-velocity dispersion in Si/SiO2 photonic crystals from white-light interferometry

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvb..69k5107g&link_type=abstract

Physical Review B, vol. 69, Issue 11, id. 115107

Physics

17

Photonic Bandgap Materials, Phase Retrieval, Multilayers, Superlattices, Interferometry

Scientific paper

The phase delay of a light beam transmitted through (Si/SiO2)m multilayers with m=2,4,6,8 is measured by white-light interferometry based on a fixed Mach-Zehnder interferometer coupled to a scanning Michelson interferometer. Results for photonic band and group velocity dispersion are obtained in a wide frequency spectrum and compare successfully with the predictions of electromagnetic theory. In particular, a strong slowing down of the group velocity at the band edges and superluminal propagation within the gap are demonstrated.

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