  Experimental data on carbon nanotube carpet and synthetic opals have been
compared by visible, infrared spectroscopy, and electron microscopy. Spectral
features of the objects under study in infrared region are registered. Three
regions of abnormal behavior of reflectance and absorbance for carbon nanotube
carpet and two regions for opals in the 7000-2000 cm-1 are observed in
comparison with the separated nanotubes or SiO2 globules in disordered states
and/or condensed state. The spectroscopic features of the photonic crystals
caused by their different microstructures at different length scales and basis
for development of a proper model for light propagation through the photonic
crystals in the IR region are presented for discussion.
