Team Nanophotonics

Scientific activities of the team nanophotonics are plasmonics and optical antennas, thermal radiation at subwavelength scales and the study of the near-field interactions of fluorescent quantum emitters with nanostructures. For more information :

Coherence length on random metal-dielectric films

Long range plasmon assisted energy tranfer

Plasmon interaction length on random metal-dielectric networks

Seckle pattern in the near field and far field

Recent publications

Spatial coherence in strongly scattering media Pierrat, R., R. Elaloufi, J.-J. Greffet, and R. Carminati Journal of the Optical Society of America A 22, no. 11, 2329 (2005)
Photon diffusion coefficient in scattering and absorbing media Pierrat, R., J.-J. Greffet, and R. Carminati Journal of the Optical Society of America A 23, no. 5, 1106 (2006)
Light propagation in multilayered scattering media beyond the diffusive regime Elaloufi, R., S. Arridge, R. Pierrat, and R. Carminati Applied Optics 46, no. 13, 2528 (2007)
Threshold of random lasers in the incoherent transport regime Pierrat, R., and R. Carminati Physical Review A 76, no. 2 (2007)
The influence of the scattering anisotropy parameter on diffuse reflection of light Pierrat, R., N. B. Braham, L. F. Rojas-Ochoa, R. Carminati, and F. Scheffold Optics Communications 281, no. 1, 18-22 (2008)
Multiple scattering theory in one dimensional space and time dependent disorder: average field [Invited] Selvestrel, A., J. Rocha, R. Carminati, and R. Pierrat Optical Materials Express 14, no. 3, 801-815 (2024) Résumé: We theoretically study the propagation of light in one-dimensional space- and time-dependent disorder. The disorder is described by a fluctuating permittivity ε(x, t) exhibiting short-range correlations in space and time, without cross correlation between them. Depending on the illumination conditions, we show that the intensity of the average field decays exponentially in space or in time, with characteristic length or time defining the scattering mean-free path ℓs and the scattering mean-free time τs. In the weak scattering regime, we provide explicit expressions for ℓs and τs, that are checked against rigorous numerical simulations.
Light in correlated disordered media Vynck, K., R. Pierrat, R. Carminati, L. S. Froufe-Pérez, F. Scheffold, R. Sapienza, S. Vignolini, and J. J. Sáenz Reviews of Modern Physics 95, no. 4 (2023)
Characterization of ejecta in shock experiments with multiple light scattering Don Jayamanne, J. A., J. R. Burie, O. Durand, R. Pierrat, and R. Carminati Journal of Applied Physics 135, no. 7 (2024) Résumé: Upon impact, the free surface of a solid metal may eject a cloud of fast and fine particles. Photon Doppler Velocimetry (PDV) is one of the optical diagnostics used to characterize these ejecta. Although the technique provides a direct way to estimate the particle velocities in the single scattering regime, it has been shown that multiple scattering cannot be neglected in real ejecta. Here, we derive a model for PDV measurements starting from the first principles of wave scattering. We establish rigorously the relationship between the specific intensity and the measured signal, as well as the Radiative Transport Equation (RTE) that describes the evolution of the specific intensity upon scattering and absorption in dynamic ejecta, including the effects of inelastic scattering and inhomogeneities in the optical properties. We also establish rigorously the connection between the Monte Carlo scheme used for numerical simulations and the solution to the RTE. Using numerical simulations, we demonstrate the crucial contribution of multiple scattering to PDV spectrograms as well as the effect of statistical inhomogeneities in particle size distribution. These results could substantially impact the analysis of ejecta by PDV.

Group Members

Permanent Researchers

Remi CARMINATI
Yannick DE WILDE
Samuel GRESILLON
Valentina KRACHMALNICOFF

Research Engineer

Jean-Marie CHASSOT

Post-doctoral Researchers

Nancy RAHBANY

PhD Students

Dorian BOUCHET
Elodie PERROS

L’Institut Langevin

Actualités

Recherche

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Séminaires & écoles thématiques

Enseignement

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Nanophotonics

Recent publications

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