Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, Pernambuco 50670-901, Brazil.
Nanoscale. 2016 Jun 7;8(21):10938-46. doi: 10.1039/c5nr07540h. Epub 2016 Jan 25.
In recent years, there has been dramatic progress in the photonics field in disordered media, ranging from applications in solar collectors, photocatalyzers, random lasing, and other novel photonic functions, to investigations into fundamental topics, such as light confinement and other phenomena involving photon interactions. This paper reports several pieces of experimental evidence of localization transition in a strongly disordered scattering medium composed of a colloidal suspension of core-shell nanoparticles (TiO2@silica) in ethanol solution. We demonstrate the crossover from a diffusive transport to a localization transition regime as the nanoparticle concentration is increased, and that an enhanced absorption effect arises at localization transition.
近年来，无序介质中的光子学领域取得了显著进展，涵盖了从太阳能收集器、光催化剂、随机激光以及其他新型光子功能的应用，到光限制和涉及光子相互作用的其他现象等基础课题的研究。本文报道了在由乙醇溶液中的核壳纳米粒子（TiO2@silica）胶体悬浮液组成的强无序散射介质中，局域化转变的几个实验证据。我们演示了当纳米颗粒浓度增加时，从扩散输运到局域化转变的转变，并在局域化转变时出现了增强的吸收效应。
