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Optics Letters

Optics Letters


  • Vol. 33, Iss. 9 — May. 1, 2008
  • pp: 998–1000

What is the direction followed by a beam in a photonic medium?

Didier Felbacq and Brahim Guizal  »View Author Affiliations

Optics Letters, Vol. 33, Issue 9, pp. 998-1000 (2008)

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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.

© 2008 Optical Society of America

OCIS Codes
(260.2110) Physical optics : Electromagnetic optics
(230.5298) Optical devices : Photonic crystals
(290.5825) Scattering : Scattering theory
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optical Devices

Original Manuscript: January 28, 2008
Revised Manuscript: March 18, 2008
Manuscript Accepted: March 18, 2008
Published: April 30, 2008

Didier Felbacq and Brahim Guizal, "What is the direction followed by a beam in a photonic medium?," Opt. Lett. 33, 998-1000 (2008)

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