论文标题
弱定位增强了超薄散射介质
Weak localisation enhanced ultrathin scattering media
论文作者
论文摘要
超薄散射介质具有低折射率对比度和潜在的辐射运输现象的出色白色外观已有十多年的历史。此类系统的例子是Cyphochilus属，光子网络结构或无序Bragg堆栈（DBS）的甲虫的尺度。虽然先前的研究将尺度上的高效散射与尺度内网络和扩散光传输的各向异性相关，但相干辐射传播动力学仍未得到解释。在这里，我们使用时间和空间分辨的相干光散射光谱来确定不同的相干光传输状态。至少有20％的散射光起源于弱局部的随机光子模式，与迄今为止假定的仅扩散光转运相反。弱定位在超薄明亮散射培养基中的这种重要作用的鉴定为有效散射光学材料建立了一种新的设计范式。
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.
