Ideal cylindrical cloak: Perfect but sensitive to tiny perturbations
Ideal cylindrical cloak: Perfect but sensitive to tiny perturbations
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DOI：
10.1103/physrevlett.99.113903
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发表时间：
2007-09-14
影响因子：
8.6
通讯作者：
Qiu, Min
中科院分区：
文献类型：
--
作者：
Ruan, Zhichao;Yan, Min;Qiu, Min
提出了一种圆柱波展开方法来获得理想的二维圆柱隐形斗篷的散射场。建立了隐形斗篷的近理想模型，解决了斗篷壳体内边界的边界问题。通过系统地研究散射系数从接近理想情况到理想情况的变化，我们确认具有理想材料参数的斗篷是完美的隐形斗篷。然而，由于零级散射系数收敛缓慢，斗篷上的微小扰动就会引起明显的场散射和穿透。
A cylindrical wave expansion method is developed to obtain the scattering field for an ideal two-dimensional cylindrical invisibility cloak. A near-ideal model of the invisibility cloak is set up to solve the boundary problem at the inner boundary of the cloak shell. We confirm that a cloak with the ideal material parameters is a perfect invisibility cloak by systematically studying the change of the scattering coefficients from the near-ideal case to the ideal one. However, because of the slow convergence of the zeroth-order scattering coefficients, a tiny perturbation on the cloak would induce a noticeable field scattering and penetration.