排序方式: 共有12条查询结果,搜索用时 15 毫秒
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We propose a method for detecting perfect invisible cloak based on the scattering of the materials of the cloak. The position of the detected cloak can also be determined. The demonstration shows that the detecting effect is obvious, and the accuracy of the detection is high. 相似文献
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由于具有将电磁波聚集到深亚波长体积的能力,表面等离激元在纳米光子技术研究工作中得到了广泛的应用。根据其性质,表面等离激元基本可以分为两大类:沿金属与介质界面传播的表面等离极化激元(SPPs)和束缚在金属表面的局域表面等离激元(LSPRs)。SPPs和对应的自由空间电磁波之间存在明显的动量失配,光栅,即一维等离激元晶格,经常被用于弥补动量失配,从自由空间激发SPPs。LSPRs是指在外部光场激发下局域在单个纳米结构周围的表面等离激元。当LSPRs被激发时,会形成近场增强效应,增大对入射光的吸收和散射。事实上,一维等离激元晶格既支持SPPs又支持LSPRs,是研究表面等离激元及其光学性质的很好的基本结构。由于LSPR这个自由度的存在,其中存在着比光子晶体更丰富的能带结构。本文将以一维等离激元晶格为研究对象,分别从能带调控、表面晶格共振、连续域中的束缚态以及玻色-爱因斯坦凝聚四个方面阐述金属等离激元的新颖性质和最新进展。这些性质对于进一步推动表面等离激元的应用具有重要意义。 相似文献
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The critical phenomena of a Brillouin laser are analyzed theoretically. The results show that the behavior of a Brillouin laser in the threshold region is a second-order phase transition. The critical point of the phase transition is the gain threshold of the Brillouin laser, and the order parameter is the amplitude of the Stokes component in stimulated Brillouin scattering. The critical slow-down phenomenon and the typical characteristics in phase transition are demonstrated. Further work on the combination of nonlinear optics and phase transition in the Brillouin laser may lead to a new view and findings that could be significant for both fields. 相似文献
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We propose a scheme for carpet anti-cloak based on the transformation optics. An anti-cloak layer is designed, which can make the external electromagnetic waves break the carpet cloak shielding. The external electromagnetic waves can be detected under the carpet cloak, while not affecting the role of carpet cloak of stealth. The Jacobian transformation tensor is calculated by numerically solving the Laplace equations with proper boundary condition. Thus, it is possible to design tile anti-cloak layer of irregular shape. The simulation results demonstrate the feasibilities and flexibilities of the structure. Design details and full-wave simulation results are provided. 相似文献
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