论文标题
具有无限自由路径的光子的Lévy飞行
Lévy flights of photons with infinite mean free path
论文作者
论文摘要
谐振蒸气对光的多重散射的特征是Lévy-type SuperDiffusion，单步尺寸分布$ p（x）\ propto 1/x^{1+α} $。我们调查了莱维（Lévy）在由50托尔（He）燃气的热rubidium蒸气碰撞中飞行的光。频繁的碰撞会产生lorentzian的吸收性和发射曲线，并具有$α<1 $的$ <1 $，并且平均步长相应。我们从变速箱的径向剖面和违反欧姆定律中提取了多个散射状态中的Lévy参数$α\大约0.5 $。测得的径向传输曲线和总扩散透射曲线通过洛伦兹线形状的数值模拟很好地再现。
Multiple scattering of light by resonant vapor is characterized by Lévy-type superdiffusion with a single-step size distribution $p(x)\propto 1/x^{1+α}$. We investigate Lévy flight of light in a hot rubidium vapor collisional-broadened by 50 torr of He gas. The frequent collisions produce Lorentzian absorptive and emissive profiles with $α<1$ and a corresponding divergent mean step size. We extract the Lévy parameter $α\approx0.5$ in a multiple scattering regime from radial profile of the transmission and from violation of the Ohm's law. The measured radial transmission profile and the total diffusive transmission curves are well reproduced by numerical simulations for Lorentzian line shapes.
