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(91) Production(s) de FELBACQ D.


What is the direction followed by a beam in a photonic medium ?
Auteur(s): Felbacq D., Guizal B.
(Article) Publié:
Optics Letters, vol. 33 p.9981000 (2008)
Ref HAL: hal00323416_v1
PMID 18451965
DOI: 10.1364/OL.33.000998
WoS: 000256166900036
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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.



Twoscale approach to the homogenization of membrane photonic crystals
Auteur(s): Felbacq D., Bouchitte G., Guizal B., Moreau A.
(Article) Publié:
Journal Of Nanophotonics, vol. 2 p.pp. 023501 (2008)
Ref HAL: hal00255910_v1
DOI: 10.1117/1.2884039
WoS: 000262931600036
Exporter : BibTex  endNote
15 Citations
Résumé: Wave propagation and diffraction in a membrane photonic crystal with finite height were studied in the case where the freespace wavelength is large with respect to the period of the structure. The photonic crystals studied are made of materials with anisotropic permittivity and permeability. Use of the concept of twoscale convergence allowed the photonic crystals to be homogenized.



Second harmonic superprism effect in 2D nonlinear photonic crystals  art. no. 659315
Auteur(s): Centeno Emmanuel, Felbacq D.
Conference: Conference on Photonic Materials, Devices and Applications II (Maspalomas, ES, 20070502)
Actes de conférence: Photonic Materials, Devices, and Applications II, vol. 6593 p.5931559315 (2007)
Ref HAL: hal00437963_v1
Exporter : BibTex  endNote
Résumé: We propose the fusion of the superprism effect and of the second harmonic generation: small variations of the fundamental field parameters cause large variations in the direction of the second harmonic emission. Phase matching conditions with very different propagation directions for the fundamental and the second harmonic fields are achieved inside 2D PCs. These results are obtained by the use of a multiple scattering method extended to the second harmonic generation problem. This nonlinear effect could possibly be applied for the design of new directional compact sources or of sensor devices.



Homogenization of negativeindex composite metamaterials: A twostep approach
Auteur(s): Cabuz A., Felbacq D., Cassagne D.
(Article) Publié:
Physical Review Letters, vol. 98 p.037403 (2007)
Ref HAL: hal00437953_v1
PMID 17358725
DOI: 10.1103/PhysRevLett.98.037403
WoS: 000243587200064
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48 Citations
Résumé: We present a twostep homogenization method for composite metamaterials. First, each layer of wires or resonators is homogenized as a slab with negative permittivity or permeability, respectively. Second, the single negative stack which results is homogenized to form the effective medium. Comparing the predictions of the first and second step can serve as a gauge of the homogeneity of the composite. We thus take a gradual approach to homogenization, asking not whether, but to what extent a composite metamaterial approaches the sought after effective medium. Our twostep approach can also capture phenomena which otherwise may be wrongly attributed to effective medium behavior. We illustrate by qualitatively reproducing and reinterpreting a set of experimental data from the literature.



Allangle phase matching condition and backward secondharmonic localization in nonlinear photonic crystals
Auteur(s): Centeno Emmanuel, Felbacq D., Cassagne D.
(Article) Publié:
Physical Review Letters, vol. 98 p.263903 (2007)
Ref HAL: hal00437532_v1
PMID 17678092
DOI: 10.1103/PhysRevLett.98.263903
WoS: 000247625100024
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25 Citations
Résumé: We demonstrate an isotropic phase matching in properly designed nonlinear twodimensional photonic crystals. In addition, by combining left and righthanded properties at the fundamental and secondharmonic frequencies, we obtain a backward secondharmonic generation. These two properties lead to an unusual secondharmonic localization effect in perfect lattice photonic crystals.



Comment on "Large negative lateral shifts from the KretschmannRaether configuration with lefthanded materials" Appl. Phys. Lett. 87, 221102, 2005
Auteur(s): Moreau Antoine, Felbacq D.
(Article) Publié:
Applied Physics Letters, vol. 90 p.066102 (2007)
Texte intégral en Openaccess :
Ref HAL: hal00128531_v1
Ref Arxiv: physics/0702006
Ref. & Cit.: NASA ADS
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Résumé: The negative shifts seen by Wang and Zhu are not due to the excitation of surface plasmons but to leaky modes of the slab propagating backward. Provided the characteristics of the LHM slab are chosen correctly, it is shown that a leaky surface plasmon can actually be excited using the KR configuration.
Commentaires: Accepté pour publication...



Homogenization of a wire photonic crystal: The case of small volume fraction
Auteur(s): Bouchitte Guy, Felbacq D.
(Article) Publié:
Siam Journal On Applied Mathematics, vol. 66 p.20612084 (2006)
Ref HAL: hal00437973_v1
DOI: 10.1137/050633147
WoS: 000241856500011
Exporter : BibTex  endNote
51 Citations
Résumé: We consider the diffraction of a monochromatic incident electromagnetic field by a bounded obstacle made of parallel high conducting metallic fibers of finite length which are periodically disposed. Our goal is to study the asymptotics of this threedimensional Maxwell problem as the period, the thickness of the rods, and the resistivity are simultaneously small. We solve this problem in the case where the filling ratio of fibers vanishes but their capacity remains positive. We find a limit volumic density of current which results in a nonlocal constitutive relation between the electric and displacement fields. This extends previous results obtained in the polarized case where a twodimensional effective local equation was found with a possibly negative effective permittivity.
