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首页> 外文会议>Metamaterials: Fundamentals and applications IV >Demonstration of Super Self-Imaging in Indefinite Anisotropic Metamaterial
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Demonstration of Super Self-Imaging in Indefinite Anisotropic Metamaterial

机译：无限各向异性超材料中超自我成像的演示

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摘要

The Talbot effect (or the self-imaging effect) can be observed for a periodic object with a pitch larger than the diffraction limit of an imaging system, where the paraxial approximation is applied. In this paper, we show that the super Talbot effect can be achieved in an indefinite metamaterial even when the period is much smaller than the diffraction limit in both two-dimensional and three-dimensional numerical simulations, where the paraxial approximation is not applied. This is attributed to the evanescent waves, which carry the information about subwavelength features of the object, can be converted into propagating waves and then conveyed to far field by the metamaterial, where the permittivity in the propagation direction is negative while the transverse ones are positive. The indefinite metamaterial can be approximated by a system of thin, alternating multilayer metal and insulator (MMI) stack. As long as the loss of the metamaterial is small enough, deep subwavelength image size can be obtained in the super Talbot effect.
机译：对于间距大于成像系统衍射极限（应用了近轴近似）的周期性物体，可以观察到Talbot效应（或自成像效应）。在本文中，我们表明即使在不应用近轴近似的二维和三维数值模拟中，当周期远小于衍射极限时，也可以在不确定的超材料中实现超级Talbot效应。这是由于the逝波携带了物体的亚波长特征信息，可以将其转换为传播波，然后通过超材料传输到远场，其中传播方向的介电常数为负，而横向的介电常数为正。不确定的超材料可以通过薄的交替的多层金属和绝缘体（MMI）堆叠系统来近似。只要超材料的损失足够小，就可以通过超级Talbot效应获得深亚波长图像尺寸。

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