Coupled selective electromagnetic waves in 1D photonic crystal with two planar cavities

In this paper, the Green function approach is used to study the propagation of electromagnetic waves through a finite photonic crystal containing two similar flat cavities. The effects of the layers thicknesses cavities and their positions on the transmission spectra are studied. The results show the occurrence of selective electromagnetic modes (one or more) in the band gaps of the periodic photonic crystal. These modes are well-defined, whose frequencies are modulated by the appropriate choice of the thicknesses and the positions of flat defects. Hence, this structure can be used in the optical telecommunications field, in the design of new filters, sensors and even for multiplexing and other engineering devices.