Volume 71, Number 4, August 2005
|Page(s)||570 - 575|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||20 July 2005|
Interaction of waveguide and localized modes in a phononic crystal
Département LPMO, Institut FEMTO-ST, CNRS UMR 6174, Université de Franche-Comté - 32 avenue de l'Observatoire, F-25044 Besançon cedex, France
2 Laboratoire de Dynamique et Structure des Matériaux Moléculaires, CNRS UMR 8024 Université de Lille I - F-59655 Villeneuve d'Ascq cedex, France
Accepted: 21 June 2005
The transmission properties of phononic crystal waveguides with grafted stub resonators were measured. The phononic crystal consists of a two-dimensional periodical array of steel 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 of which can be controlled by arranging a proper sequence of stubs. These effects are interpreted as the interaction of propagating waveguide modes with localized stub resonances.
PACS: 43.20.+g – General linear acoustics / 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound / 63.20.-e – Phonons in crystal lattices
© EDP Sciences, 2005
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