Core-shell TiO 2 @Silica nanoparticles for light confinement

Jiménez‐Villar, Ernesto; Mestre, Valdeci; Martins, Weliton S.; Basso, Gabriel F.; Silva, Iran F. da; Sá, Gilberto F. de

doi:10.1016/j.matpr.2017.09.068

Cited by 12 publications

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“…Thereby, owing to the inhomogeneity at microscopic scale, localized and extended modes, coming from different regions with klT values lower and higher than unity, respectively, can coexist in a same sample. This picture is what we have called in our previous works as the localization transition regime [6,7,24,43,54]. In this way, the average klT value, extracted from the coherent backscattering experiment, would not provide a definitive criterion for the critical phase of localization transition.…”

Section: Backscattering Experimentsmentioning

confidence: 90%

“…The inelastic scattering processes (absorption or nonlinearity) can lead to a decrease in the photon coherence length, hampering the interference effects (localization) [1,23]. In fact, according to the theoretical prediction of Sajeev John [1] and our previous experimental finding [6,24], an enhanced absorption arises when the system approaches localization. In a previous work [6], we reported several pieces of experimental evidence of localization transition in a strongly disordered optical medium composed by core-shell TiO2@Silica nanoparticles (NPs) in ethanol solution.…”

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confidence: 99%

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Anomalous transport of light at the phase transition to localization: strong dependence with incident angle

et al. 2018

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Disordered optical media have seen a growing interest in recent year due to their potential applications in solar collectors, random lasers, light confinement and other advanced photonic functions. This paper studies the transport of light for different incidence angles in a strongly disordered optical medium composed by core-shell TiO2@Silica nanoparticles suspended in ethanol solution. A decrease of optical conductance and an increase of absorption near the input border are reported when the incidence angle increases. The specular reflection, measured for the photons that enter the sample, is lower than the effective internal reflection undergone by the coherently backscattered photons in the exact opposite direction, indicating a non-reciprocal propagation of light. This study represents a novel approach in order to understand the complex physics involved at the phase transition to localization.

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