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arXiv 1711.02420physics.opticsastro-ph.COgr-qc
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波在超材料中的传播模拟宇宙弦的拓扑

Wave propagation in metamaterials mimicking the topology of a cosmic string

Isabel Fernández-Núñez, Oleg Bulashenko

摘要:

我们研究了光在超材料介质中传播时的干涉和光的衍射,超材料介质模拟了宇宙弦的时空--一种具有曲率奇异性的拓扑缺陷。这种现象看起来像是阿哈罗诺夫-玻姆效应的引力类比,因为光在黎曼张量消失的区域传播,但仍受到弦核非零曲率的影响。我们进行了全波数值模拟的超材料介质,并给出了解析解释的结果,利用渐近理论的衍射,这是非常一致的。特别是,我们表明,在介质中的圆锥形奇点的波传播的主要特点可以解释由四波干涉涉及两个几何光学和两个衍射波。

英文摘要:

We study the interference and diffraction of light when it propagates through a metamaterial medium mimicking the spacetime of a cosmic string, -- a topological defect with curvature singularity. The phenomenon may look like a gravitational analogue of the Aharonov-Bohm effect, since the light propagates in a region where the Riemann tensor vanishes being nonetheless affected by the non-zero curvature confined to the string core. We carry out the full-wave numerical simulation of the metamaterial medium and give the analytical interpretation of the results by use of the asymptotic theory of diffraction, which turns out to be in excellent agreement. In particular we show that the main features of wave propagation in a medium with conical singularity can be explained by four-wave interference involving two geometrical-optics and two diffracted waves.

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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