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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 15 — Jul. 19, 2010
  • pp: 15682–15690

Anomalous group velocity at the high energy range of a 3D photonic nanostructure

Muriel Botey, Jordi Martorell, Luis A. Dorado, Ricardo A. Depine, Gabriel Lozano, and Hernán Míguez  »View Author Affiliations


Optics Express, Vol. 18, Issue 15, pp. 15682-15690 (2010)
http://dx.doi.org/10.1364/OE.18.015682


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Abstract

We report on a study of electromagnetic waves propagation in thin periodically ordered photonic nanostructures in the spectral range where the light wavelength is on the order of the lattice parameter. The vector KKR method we use allows us to determine the group index from finite photonic structures including extinction providing confirmation of recently emerged results. We show that for certain frequencies the group velocity of opal slabs can either be superluminal or approach zero depending on the crystal thickness and the unavoidable presence of losses. In some cases, group velocity can be negative. Such behavior can be clearly attributed to the finite character of the three-dimensional structure and reproduces previously reported experimental observations. Calculations show that contrary to the predictions of extraordinary group velocity reductions for infinite periodic structures, the group velocity of real opals may exhibit strong fluctuations at the high energy range. Hence, a direct identification between the calculated anomalous group velocities, for an actual opal film, and the predicted propagating low dispersion modes for an ideal infinite ordered structure seems difficult to establish.

© 2010 OSA

OCIS Codes
(160.4236) Materials : Nanomaterials
(160.5293) Materials : Photonic bandgap materials
(050.5298) Diffraction and gratings : Photonic crystals

ToC Category:
Photonic Crystals

History
Original Manuscript: February 19, 2010
Revised Manuscript: April 5, 2010
Manuscript Accepted: April 6, 2010
Published: July 9, 2010

Citation
Muriel Botey, Jordi Martorell, Luis A. Dorado, Ricardo A. Depine, Gabriel Lozano, and Hernán Míguez, "Anomalous group velocity at the high energy range of a 3D photonic nanostructure," Opt. Express 18, 15682-15690 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-15-15682


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References

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