A Mach–Zehnder interferometer was developed for accurately measuring relative phase shifts of light propagating in photonic colloidal crystals deep into the stop bands. These phase shifts can be used to determine the change in index of refraction and the optical dispersion relation from photonic band structure near the band edges. Phase measurements of colloidal crystals incorporating an impurity peak in the transmission spectrum are also presented.
© 1998 Optical Society of America
(030.1670) Coherence and statistical optics : Coherent optical effects
(050.5080) Diffraction and gratings : Phase shift
(290.3030) Scattering : Index measurements
(350.2460) Other areas of optics : Filters, interference
Björn T. Rosner, Garrett J. Schneider, and George H. Watson, "Interferometric investigation of photonic band-structure effects in pure and doped colloidal crystals," J. Opt. Soc. Am. B 15, 2654-2659 (1998)