title: Optimized invisibility cloaks from the Logarithm conformal mapping.
abstract: Invisibility cloaks designed from the coordinate transformation method have attracted increasing interest recently. Conformal transformation optics scheme leads to cloaks that possess isotopic media, thus provides a prospective way to facilitate easier realization. Reducing the maximum value of the refractive index required by the cloaks is very important in practical imple- mentation. This letter studies on how the parameters in the logarithm conformal mapping control the cloaking effect. The optimized invisibility cloaks are designed. The maximum values of the refractive index required from the first kind and the second kind of logarithm conformal mappings are reduced to 9.779 and 12.936, respectively.
authors.affiliation: The Department of Electronic Science, Xiamen University, Xiamen, 361005, China.
authors.forename: Chunhui
authors.initials: C
authors.lastname: Zhu
authors.affiliation: The Department of Automation, Xiamen University, Xiamen, 361005, China.
authors.forename: Lijun
authors.initials: L
authors.lastname: Liu
authors.affiliation: The Department of Electronic Science, Xiamen University, Xiamen, 361005, China.
authors.forename: Zhengyong
authors.initials: Z
authors.lastname: Song
authors.affiliation: The Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA.
authors.forename: Qing Huo
authors.initials: QH
authors.lastname: Liu