PT symmetry in optics beyond the paraxial approximation

被引：36

作者：

Huang, Changming ^{[1
]}

Ye, Fangwei ^{[1
]}

Kartashov, Yaroslav V. ^{[2
]}

Malomed, Boris A. ^{[3
]}

Chen, Xianfeng ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Dept Phys & Astron, State Key Lab Adv Opt Commun Syst & Networks, Shanghai 200240, Peoples R China

[2] Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia

[3] Tel Aviv Univ, Fac Engn, Sch Elect Engn, Dept Phys Elect, IL-69978 Tel Aviv, Israel

来源：

OPTICS LETTERS | 2014年 / 39卷 / 18期

关键词：

NONLINEAR LATTICES;

D O I：

10.1364/OL.39.005443

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

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 Schrodinger equation and the paraxial wave equation governing the propagation of light in guiding structures. We go beyond the paraxial approximation and demonstrate, solving the full set of the Maxwell's equations for the light propagation 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 guiding 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. (C) 2014 Optical Society of America

引用

页码：5443 / 5446

页数：4

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