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arXiv 1408.2630physics.opticsnlin.PS
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超越傍轴近似的光学PT对称性

PT-symmetry in optics beyond the paraxial approximation

Changming Huang, Fangwei Ye, Yaroslav V. Kartashov, Boris A Malomed, Xianfeng Chen

摘要:

PT对称性的概念起源于量子场论,在光学中得到了深入的研究,这是由薛定谔方程和控制光在波导结构中传播的傍轴波动方程之间的相似性所激发的。我们超越了傍轴近似的界限,并证明,使用麦克斯韦方程组的解决方案,在深亚波长波导和周期性晶格中传播的光束与“平衡”的增益和损耗,PT对称性可能会保持不间断在这种设置。此外,亚波长光学结构中的PT对称性在最初被破坏之后可以随着增益和损耗的增加而恢复。临界增益/损耗水平,在该破碎和随后恢复的PT对称性发生,强烈依赖于结构的规模。

英文摘要:

The concept of the PT-symmetry, originating from the quantum field theory, has been intensively investigated in optics, stimulated by the similarity between the Schrödinger equation and the paraxial wave equation that governs the propagation of light in a guiding structure. We go beyond the bounds of the paraxial approximation and demonstrate, using the solution of the Maxwell's equations for light beams propagating in deeply subwavelength waveguides and periodic lattices with "balanced" gain and loss, that the PT symmetry may stay unbroken in this setting. Moreover, the PT-symmetry in subwavelength optical structures may be restored after being initially broken upon the increase of gain and loss. Critical gain/loss levels, at which the breakup and subsequent restoration of the PT symmetry occur, strongly depend on the scale of the structure.

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。

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