ABSTRACT
A photonic crystals (PC) is a medium in which the refractive index or dielectric constant varies periodically along the whole medium. This structure can be classified in One-Dimensional PC structures because the refractive index varies in one direction–a typical example is a Bragg mirror. From the technological aspect, PCs can be fabricated using diverse methods, such as those based on self-organizing silica particles, colloidal crystals, X-ray photolithography, and holographic laser. The region in which the photonic state is forbidden is the photonic band gap (PBG) where the structures are PCs. The shape and width of its PBG depends on the structural and morphological features of the H and L layers, as well as on the interface roughness. The reflectance spectrum from 1D-porous silicon photonic crystals (PSPC) contains all information about the structural and optical features and about how light interacts with it.
