A method of controlling wave propagation in initially spatially periodic mediaC. Inserra1, V. Tournat1 and V. Gusev2
1 Laboratoire d'Acoustique de l'Université du Maine UMR-CNRS 6613 - Av. Olivier Messiaen, 72085 Le Mans Cedex 9, France
2 Laboratoire de Physique de l'Etat Condensé UMR-CNRS 6087 - Av. Olivier Messiaen, 72085 Le Mans Cedex 9, France
received 22 January 2007; accepted in final form 27 March 2007; published May 2007
published online 27 April 2007
General physical arguments as well as an analytical theory for a particular system indicate that in addition to a traditional method of wave control through gap opening in an allowed frequency band there exists an opportunity to control waves through window opening in a forbidden frequency band. By introducing additional (second) periodicity in an initially periodic material it is possible to guide high-frequency waves in the directions initially forbidden for their propagation.
43.35.Gk - Phonons in crystal lattices, quantum acoustics.
42.70.Qs - Photonic bandgap materials.
43.20.Bi - Mathematical theory of wave propagation.
© Europhysics Letters Association 2007