弱局域化增强的散射介质
Weak localisation enhanced ultrathin scattering media
摘要：
具有低折射率对比度的散射介质的明亮白色外观和潜在的辐射传输现象吸引了科学家十多年。这种系统的例子是Cyphochilus属的甲虫的鳞片、光子网络结构或无序布拉格堆叠（DBS）。虽然先前的研究将尺度中的高效散射与尺度内网络和漫射光传输的各向异性联系起来，但相干辐射传播动力学仍然没有得到解释。在这里，我们确定不同的相干光传输制度，使用时间和空间分辨相干光散射光谱。至少20%的收集的散射光来自弱局部随机光子模式，与迄今为止假设的仅漫射光传输相反。弱局域化在微亮散射介质中的重要作用的识别为有效的散射光学材料建立了一个新的设计范例。
英文摘要：
The brilliant white appearance of ultrathin scattering media with low refractive index contrast and the underlying radiative transport phenomena fascinate scientists for more than a decade. Examples of such systems are the scales of beetles of the genus Cyphochilus, photonic network structures or disordered Bragg stacks (DBS). While previous studies relate the highly efficient scattering in the scales to the anisotropy of the intra-scale network and diffusive light transport, the coherent radiation propagation dynamics remained unaccounted for. Here, we identify different coherent light transport regimes using time and spatially resolved coherent light scattering spectroscopy. At least 20% of the collected scattered light originates from weakly localised random photonic modes, in contrast to solely diffusive light transport assumed to date. The identification of this significant role of weak localisation in ultrathin brilliant scattering media establishes a new design paradigm for efficient scattering optical materials.
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