Trapped-mode, pass- and gap-band effects waveguides with obstacles

Resonance localization of incident wave energy near obstacles in the form of energy vortices resulting in sharp blocking, known as a trapped mode effect, is under investigation. While resonance response of a single obstacle works as a blocker, for the waveguide with several obstacles it is observed that it becomes opened in narrow vicinities of resonance frequencies. With the increase of defects number pass frequencies segments expand forming the same pass bands as the Bloch-Floquet theory predicts.