标题： 倒置非线性光子晶体中的准孤子波 显示英文标题

标题： Quasi-compactons in inverted nonlinear photonic crystals

摘要： 我们研究了在具有线性与非线性晶格竞争的光子晶体中大振幅的一维孤立波，其中线性势的极小值与非线性伪势的极大值重合，反之亦然（反向非线性光子晶体，INPhCs），在可饱和自聚焦非线性情况下。 这种晶体最近使用SU-8和罗丹明-B光学材料的混合物制造而成。 通过数值方法和分析近似，我们发现大振幅孤子是宽而尖锐局部稳定的脉冲（准紧致子，QCs）。 随着总功率P的增加，QC的质心在线性势的极小值和极大值之间进行多次切换。 与立方体 INPhCs不同，大振幅孤子在具有可饱和非线性的介质中是可移动的。 找到了使孤子运动所需的踢动阈值作为P的函数。也考虑了移动QCs之间的碰撞。 显示英文摘要

摘要： We study large-amplitude one-dimensional solitary waves in photonic crystals featuring competition between linear and nonlinear lattices, with minima of the linear potential coinciding with maxima of the nonlinear pseudopotential, and vice versa (inverted nonlinear photonic crystals, INPhCs), in the case of the saturable self-focusing nonlinearity. Such crystals were recently fabricated using a mixture of SU-8 and Rhodamine-B optical materials. By means of numerical methods and analytical approximations, we find that large-amplitude solitons are broad sharply localized stable pulses (quasi-compactons, QCs). With the increase of the totalpower, P, the QC's centroid performs multiple switchings between minima and maxima of the linear potential. Unlike cubic INPhCs, the large-amplitude solitons are mobile in the medium with the saturable nonlinearity. The threshold value of the kick necessary to set the soliton in motion is found as a function of P. Collisions between moving QCs are considered too.