(1+1)维非局域非线性介质的边界对表面孤子的影响  

Impact of boundary on the surface soliton in (1+1)-dimensional nonlocal nonlinear media

作　　者：赵璨[1] 马学凯[1] 王靖[1] 陆大全[1] 胡巍[1] 

机构地区：[1]华南师范大学信息光子技术广东省高校重点实验室,广州510631

出　　处：《物理学报》2013年第9期224-231,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10804033;11174090)资助的课题~~

摘　　要：对非局域非线性介质中,(1+1)维表面亮孤子进行了研究,主要考虑了边界对孤子的影响.首先,在归一化系统中,对于给定的边界条件,求出了表面孤子的解析解,得到了表面孤子的临界功率和平衡位置.其次,在数值模拟中,发现当样品宽度太小时,受到边界影响而很难形成表面孤子,只有当样品宽度足够大时,边界对孤子的影响可以忽略,从而形成稳定传输的孤子,并与解析的结果相似.此外,还考虑了在光束偏离平衡位置入射的情况下,边界对孤子的影响,发现此时光束在边界附近做周期性震荡,相当于体介质中双光束相互作用的结果,两者运动轨迹与震荡周期完全符合.In this paper, the impacts of boundary on the surface bright soliton in （1＋1）-dimensional nonlocal nonlinear media are investigated First the solution of the surface soliton under the given boundary conditions in a normalized system is derived, and then, the critical power and the balance position of the surface soliton are obtained. Next, in the numerical simulation, due to the impact of boundary, it is difficult to form stable solitons when the width of the sample is too small. And the impact of the boundary on the soliton can be ignored only if the width of the sample is large enough; then the stable soliton can exist, which is similar to the analytical results. In addition, the impact of the boundary on the surface soliton when beams do not input from its equilibrium position is also investigated. In this case, the beam will propagate oscillating periodically about the stationary position, which is equivalent to the interaction of two out-of-phase solitons in nonlocal bulk media. Both the oscillating trajectory and period dovetail coinsde nicely with each other.

关 键 词：非局域非线性 边界 样品宽度 周期震荡 

分 类 号：O437[机械工程—光学工程]