arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1405.3032physics.opticsnlin.PS
收藏

具有平衡增益和损耗的非线性多芯波导结构

Nonlinear multi-core waveguiding structures with balanced gain and loss

Alejandro J. Martínez, Mario I. Molina, Sergei K. Turitsyn, Yuri S. Kivshar

摘要:

本文研究了增益和损耗平衡的径向对称多芯波导中线性和非线性定态模的存在性、稳定性和动力学性质。我们证明,在一般情况下,该系统可以减少到一个有效的${\cal PT}$对称二聚体与不对称耦合。在线性情况下,我们发现在${\cal PT}$对称性破缺之前存在两个具有实传播常数的模,而其他模的传播常数总是具有非零虚部.当增益局限于波导结构的芯(环)中时,这导致模式的稳定(不稳定)传播。在非线性响应的情况下,我们表明,非线性,增益和损耗之间的相互作用引起高度的不稳定性,只有小窗口的参数空间中观察到准稳定的传播。我们提出了一种新的稳定机制的基础上的周期性调制的增益和损耗沿传播方向,允许有界光传播的多芯波导结构。

英文摘要:

We study existence, stability, and dynamics of linear and nonlinear stationary modes propagating in radially symmetric multi-core waveguides with balanced gain and loss. We demonstrate that, in general, the system can be reduced to an effective ${\cal PT}$-symmetric dimer with asymmetric coupling. In the linear case, we find that there exist two modes with real propagation constants before an onset of the ${\cal PT}$-symmetry breaking while other modes have always the propagation constants with nonzero imaginary parts. This leads to a stable (unstable) propagation of the modes when gain is localized in the core (ring) of the waveguiding structure. In the case of nonlinear response, we show that an interplay between nonlinearity, gain, and loss induces a high degree of instability, with only small windows in the parameter space where quasi-stable propagation is observed. We propose a novel stabilization mechanism based on a periodic modulation of both gain and loss along the propagation direction that allows bounded light propagation in the multi-core waveguiding structures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑