A colorimetric resonant mesoporous silicon photonic crystal is used as a surface binding platform for biochemical
detection. The photonic crystal, when illuminated with white light at normal incidence, is designed to reflect a photonic
band gap (PBG) centered at a single wavelength. When molecules are attached to the internal surfaces of pores, the PBG
is shifted due to the change in refractive index of the porous silicon layers. The planar structure of the platform can be
easily integrated into a fluidic cell. We have optically verified the presence of proteins and chemicals as a colorimetric
shift in the reflectivity spectrum of mesoporous silicon photonic crystals and microcavities.
We present the results of numerical and experimental studies of spatial and temporal separation of femtosecond light
pulses in 1D photonic crystals (PC) in Laue diffraction geometry. The porous silicon PC are fabricated by
electrochemical etching using and contain 400 pairs of alternating layers with optical thickness 600 and 680 nm, so that
the center of the photonic band gap is placed at about 2600 nm. Spatial splitting of the laser pulse into two, one of them
corresponding to the transmitted beam and the second - to the diffracted one, are observed. It is shown that the diffraction
angle of the second beam changes when the wavelength of light is tuning, in accordance with the theoretical estimations.
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