Interaction of waveguide and localized modes in a phononic crystal

Sarah Benchabane (1) , Abdelkrim Khelif (1) , Abdelkrim Choujaa (1) , Bahram Djafari-Rouhani (2) , Vincent Laude (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
2 LDSMM - Laboratoire de dynamique et structure des matériaux moléculaires

The transmission properties ofphononic crystal waveguides with grafted stub resonators were measured. The phononic crystal consists of a two-dimensional periodical array ofsteel rods immersed in water. Waveguides for acoustic waves are created by removing a line defect and stubs are formed by removing rods from the sidewalls of the waveguide. Depending on the stub geometry, definite wavelengths are reflected from the stub creating a one-dimensional bandgap within the waveguide transmission spectrum, the bandwidth ofwhich can be controlled by arranging a proper sequence ofstubs. These effects are interpreted as the interaction ofpropagating waveguide modes with localized stub resonances.

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

Sarah Benchabane, Abdelkrim Khelif, Abdelkrim Choujaa, Bahram Djafari-Rouhani, Vincent Laude. Interaction of waveguide and localized modes in a phononic crystal. EPL - Europhysics Letters, 2005, 71, pp.570. ⟨10.1209/epl/i2005-10131-2⟩. ⟨hal-00074873⟩