Compact-sized and broadband carpet cloak and free-space cloak Export

@article{citeulike:6056414, abstract = {Recently, invisible cloaks have attracted much attention due to their exciting property of invisibility, which are based on a solid theory of transformation optics and quasi-conformal mapping. Two kinds of cloaks have been proposed: free-space cloaks, which can render objects in free space invisible to incident radiation, and carpet cloaks (or ground-plane cloaks), which can hide objects under the conducting ground. The first free-space and carpet cloaks were realized in the microwave frequencies using metamaterials. The free-space cloak was composed of resonant metamaterials, and hence had restriction of narrow bandwidth and high loss; the carpet cloak was made of non-resonant metamaterials, which have broad bandwidth and low loss. However, the carpet cloak has a severe restriction of large size compared to the cloaked object. The above restrictions become the bottlenecks to the real applications of free-space and carpet cloaks. Here we report the first experimental demonstration of broadband and low-loss directive free-space cloak and compact-sized carpet cloak based on a recent theoretical study. Both cloaks are realized using non-resonant metamaterials in the microwave frequency, and good invisibility properties have been observed in experiments. This approach represents a major step towards the real applications of invisibility cloaks.}, author = {Ma, Hui F. and Jiang, Wei X. and Yang, Xin M. and Zhou, Xiao Y. and Cui, Tie J.}, citeulike-article-id = {6056414}, citeulike-linkout-0 = {http://dx.doi.org/10.1364/OE.17.019947}, citeulike-linkout-1 = {http://www.opticsinfobase.org/abstract.cfm?id=187209}, day = {26}, doi = {10.1364/OE.17.019947}, journal = {Opt. Express}, month = {October}, number = {22}, pages = {19947--19959}, posted-at = {2009-11-02 14:09:36}, priority = {2}, publisher = {OSA}, title = {Compact-sized and broadband carpet cloak and free-space cloak}, url = {http://dx.doi.org/10.1364/OE.17.019947}, volume = {17}, year = {2009} }

TY - JOUR ID - citeulike:6056414 L3 - citeulike-article-id:6056414 N2 - Recently, invisible cloaks have attracted much attention due to their exciting property of invisibility, which are based on a solid theory of transformation optics and quasi-conformal mapping. Two kinds of cloaks have been proposed: free-space cloaks, which can render objects in free space invisible to incident radiation, and carpet cloaks (or ground-plane cloaks), which can hide objects under the conducting ground. The first free-space and carpet cloaks were realized in the microwave frequencies using metamaterials. The free-space cloak was composed of resonant metamaterials, and hence had restriction of narrow bandwidth and high loss; the carpet cloak was made of non-resonant metamaterials, which have broad bandwidth and low loss. However, the carpet cloak has a severe restriction of large size compared to the cloaked object. The above restrictions become the bottlenecks to the real applications of free-space and carpet cloaks. Here we report the first experimental demonstration of broadband and low-loss directive free-space cloak and compact-sized carpet cloak based on a recent theoretical study. Both cloaks are realized using non-resonant metamaterials in the microwave frequency, and good invisibility properties have been observed in experiments. This approach represents a major step towards the real applications of invisibility cloaks. IS - 22 JF - Opt. Express EP - 19959 TI - Compact-sized and broadband carpet cloak and free-space cloak PB - OSA VL - 17 SP - 19947 AU - Ma, Hui AU - Jiang, Wei AU - Yang, Xin AU - Zhou, Xiao AU - Cui, Tie PY - 2009/10/26/ UR - http://dx.doi.org/10.1364/OE.17.019947 ER -