Artículo
Light generation at the anomalous dispersion high energy range of a nonlinear opal film
Autor/es | Botey, Muriel
Molinos Gómez, Alberto Dorado, Luis A. Depine, Ricardo A. Lozano Barbero, Gabriel Sebastián Martorell, Jordi Mihi, Agustín Maymó, Marc Míguez García, Hernán Ruy |
Fecha de publicación | 2009 |
Fecha de depósito | 2018-04-19 |
Publicado en |
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Resumen | We study experimentally and theoretically light propagation and generation at the high energy range of a close-packed fcc photonic crystal of polystyrene spheres coated with a nonlinear material. We observe an enhancement ... We study experimentally and theoretically light propagation and generation at the high energy range of a close-packed fcc photonic crystal of polystyrene spheres coated with a nonlinear material. We observe an enhancement of the second harmonic generation of light that may be explained on the basis of amplification effects arising from propagation at anomalous group velocities. Theoretical calculations are performed to support this assumption. The vector KKR method we use allows us to determine, from the linear response of the crystal, the behavior of the group velocity in our finite photonic structures when losses introduced by absorption or scattering by defects are taken into account assuming a nonzero imaginary part for the dielectric constant. In such structures, we predict large variations of the group velocity for wavelengths on the order or smaller than the lattice constant of the structure, where an anomalous group velocity behavior is associated with the flat bands of the photonic band structure. We find that a direct relation may be established between the group velocity reduction and the enhancement of a light generation processes such as the second harmonic generation we consider. However, frequencies for which the enhancement is found, in the finite photonic crystals we use, do not necessarily coincide with the frequencies of flat high energy bands. |
Identificador del proyecto | CSD2007-00046
MAT2008-00910/NAN MAT2008-02166 CSD2007- 00007 FQM3579. |
Cita | Botey, M., Molinos Gómez, A., Dorado, L.A., Depine, R.A., Lozano Barbero, G. S., Martorell, J.,...,Míguez García, H.R. (2009). Light generation at the anomalous dispersion high energy range of a nonlinear opal film. Optics Express, 17 (15), 12210-12216. |
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