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arXiv 1508.01434physics.optics
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含时磁电介质中的时间循环双稳态

Time Circular Birefringence in Time-Dependent Magnetoelectric Media

Ruo-Yang Zhang, Yan-Wang Zhai, Shi-Rong Lin, Qing Zhao, Weijia Wen, Mo-Lin Ge

摘要:

光在含时介质中的传播具有许多特殊的性质,可以用来实现频率转换、时间隐身和模拟宇宙学现象。本文研究了含时轴子型磁电(ME)介质,证明了这种介质中的光总是存在两个简并模,它们的圆偏振方向相反,对应于一个波矢$\mathbf{k}$,并将这种效应命名为“时间圆双折射”(TCB)。通过改变时空状态,线偏振入射波在ME介质的时间界面上通过“时间折射”和“时间反射”,可以同时出现一对TCB模。两个TCB模的叠加导致了“时间法拉第效应”,即全球统一的偏振轴随时间旋转。本文还研究了圆偏振高斯脉冲穿越时间界面的情况。如果脉冲的波矢谱主要集中在非行波段,则脉冲将被捕获到中心几乎固定的位置,而其强度将快速增长。此外,我们还提出了一种利用分子流体外加平行于光方向的时变电场和磁场的实验方案,以实现这些现象的实际应用。

英文摘要:

Light traveling in time-dependent media has many extraordinary properties which can be utilized to convert frequency, achieve temporal cloaking, and simulate cosmological phenomena. In this paper, we focus on time-dependent axion-type magnetoelectric (ME) media, and prove that light in these media always has two degenerate modes with opposite circular polarizations corresponding to one wave vector $\mathbf{k}$, and name this effect "time circular birefringence" (TCB). By interchanging the status of space and time, the pair of TCB modes can appear simultaneously via "time refraction" and "time reflection" of a linear polarized incident wave at a time interface of ME media. The superposition of the two TCB modes causes the "time Faraday effect", namely the globally unified polarization axes rotate with time. A circularly polarized Gaussian pulse traversing a time interface is also studied. If the wave-vector spectrum of a pulse mainly concentrates in the non-traveling-wave band, the pulse will be trapped with nearly fixed center while its intensity will grow rapidly. In addition, we propose an experimental scheme of using molecular fluid with external time-varying electric and magnetic fields both parallel to the direction of light to realize these phenomena in practice.

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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