论文标题
非富晶格中部分连贯的光的传播
Propagation of Partially Coherent Light in non-Hermitian Lattices
论文作者
论文摘要
通过在近似近似中使用二阶古典连贯理论的形式主义，引入了部分连贯光的频带理论。已经证明，描述田间点对之间的相关性的跨光谱密度函数可以具有频带和间隙，并形成相关带结构。在非铁元性周期性结构中部分相干光束的传播被认为是为了阐明晶格中相干性程度与增益/损失之间的相互作用。我们将形式主义应用于具有平等时间对称性的晶格中的部分连贯的Bloch振荡，并证明振荡可以在此类介质中维持，但它们很大程度上取决于光束的空间相关性。呼吸与振荡模式之间的过渡被证明是由空间连贯性程度引起的。
Band theory for partially coherent light is introduced by using the formalism of second-order classical coherence theory under paraxial approximation. It is demonstrated that the cross-spectral density function, describing correlations between pairs of points in the field, can have bands and gaps and form a correlation band structure. The propagation of a partially coherent beam in non-Hermitian periodic structures is considered to elucidate the interplay between the degree of coherence and the gain/loss present in the lattice. We apply the formalism to study partially coherent Bloch oscillations in lattices having parity-time symmetry and demonstrate that the oscillations can be sustained in such media but they are strongly dependent upon the spatial correlations of the beam. A transition between breathing and oscillating modes is shown to be induced by the degree of spatial coherence.
