Auteur(s): Felbacq D., Guizal B.
(Article) Publié: Optics Letters, vol. 33 p.998-1000 (2008)
Ref HAL: hal-00323416_v1
PMID 18451965
DOI: 10.1364/OL.33.000998
WoS: 000256166900036
Exporter : BibTex | endNote
4 Citations
Résumé:
The direction of propagation followed by a monochromatic beam in a periodic structure is generally deduced from the isofrequency diagram, which is related to the group velocity. However, the group velocity is the derivative of ω with respect to the wavenumber, while the behavior of the beam should depend on ω only. In the subwavelength regime, a method for choosing the relevant branch of the isofrequency diagram and relying on the behavior of the system at ω only is described.