Diffraction anomalies in hybrid structures based on chalcogenide Ge_2Sb_2Te_5-coated opal photonic crystals

摘要

The results of spectroscopic studies of the diffraction anomalies (the so-called resonant Wood anomalies) in spatially periodic hybrid structures based on chalcogenide Ge_2Sb_2Te_5-coated opal films of various thickness are presented. A theoretical analysis of spectral-angular dependencies of the Wood anomalies has been made by means of a phenomenological approach using the concept of the effective refractive index of the waveguiding surface layer.