光子液滴及其动力学的观测
Observation of photon droplets and their dynamics
摘要：
我们提出了一个有吸引力的（聚焦）非局部非线性介质中的光子液滴的实验证据。光子液滴是自约束的、有限尺寸的光状态，其由于竞争吸引力和排斥力的平衡而对尺寸和形状扰动具有鲁棒性。它最近已被证明，理论上，通过多极展开的非局部非线性，自约束状态的出现是由于s波和d波非线性项之间的竞争，以及衍射。理论上的光子液滴框架包括类孤子静止基态和非类孤子动力学，当系统从平衡位移时，即驱动到激发态。我们目前的数值和实验支持这些光子液滴状态和测量的光子液滴轨道角动量的动态演化的存在。
英文摘要：
We present experimental evidence of photon droplets in an attractive (focusing) nonlocal nonlinear medium. Photon droplets are self-bound, finite-sized states of light that are robust to size and shape perturbations due to a balance of competing attractive and repulsive forces. It has recently been shown theoretically, via a multipole expansion of the nonlocal nonlinearity, that the self-bound state arises due to competition between the s-wave and d-wave nonlinear terms, together with diffraction. The theoretical photon droplet framework encompasses both a soliton-like stationary ground state and the non-soliton-like dynamics that ensue when the system is displaced from equilibrium, i.e. driven into an excited state. We present numerics and experiments supporting the existence of these photon droplet states and measurements of the dynamical evolution of the photon droplet orbital angular momentum.
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