An Improved Method of Designing Isotropic Multilayered Spherical Cloak for Electromagnetic Invisibility

• 作者: 裴永茂 陈明继
• 来源期刊: 中国物理快报(英文版)
• 学科: 物理学
• 关键词: 各向同性 电磁隐身 球形 设计 前向散射 各向异性 介电常数 工作波长
• 年，卷（期）: 2010,（3）
• 页码范围: 132-135
• 页数: 4页
• 分类号: O413.1 V271.44
• 语种: 英文

摘要

The classic anisotropic spherical cloak can be mimicked by many alternating thin layers of isotropic metamaterials [Qiu et al. Phys. Rev. E 79 (2009) 047602]. We propose an improved method of designing permittivity and permeability in each isotropic layer, which eliminates the jumping of the refractive index at the interface. Multilayered spherical cloaks designed by the present method perform much better than those by Qiu et al., especially for forward scattering. It is found that the ratio of layer thickness to the operating wavelength plays an important role in achieving invisibility. The presented cloak should be discretized to at least 40 layers to meet the thickness threshold corresponding to 10%scattering.