Temperature dependence of the parameters of stop bands of globular photonic crystals

The results of the experimental study of the characteristics of stop bands of globular photonic crystals are presented depending of the globule diameter, temperature, and the presence of a dielectric medium in pores between globules. The reflectance spectra of the (111) surface of a globular photonic crystal are analyzed using a fiber-optic technique. As the sample temperature is lowered, the reflectance maximum shifts to the long-wavelength spectral region. The spectral characteristics of stop bands are compared with calculations based on the Wolf-Bragg formula.