Multiwave interaction analysis of a coaxial Bragg structure with a localized defect introduced in sinusoidal corrugations

A multiwave interaction formulation is presented to investigate the effects of a localized defect on the reflective spectrum of a coaxial Bragg structure with sinusoidal corrugations. Good agreement has been achieved between the theoretical results obtained by the present formulation and those simulated by the software HFSS, which confirms the validity and the significance of the multiwave interaction formulation. It is found that, the localized defect creates defected eigenmodes within each reflective band gap of the initial standard Bragg structure, which the parameter can be controlled by the location of the localized defect.