title: Microwave collimation based on zero index metamaterials with Dirac point.
abstract: The microwave zero index metamaterials (ZIMs) can be realized by loading lumped elements into two-dimensional transmission lines (TLs) with Dirac cones whose linear dispersion can appear around the center of the Brillouin zone. Based on Snell's law, the refracted angle of waves nearly equals zero when a point source radiates from the ZIM TL into the double positive (DPS) one in the ZIM-DPS TL structure. Experimental results demonstrate that at Dirac point the curved wavefronts in the ZIM region are transformed into planar ones in DPS region.
authors.affiliation: MOE Key Laboratory of Advanced Micro-structure Materials, Department of Physics, Tongji University, Shanghai 200092, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Fang
authors.forename: Yewen
authors.initials: Y
authors.lastname: Zhang
authors.forename: Fangfei
authors.initials: F
authors.lastname: Li
authors.forename: Haitao
authors.initials: H
authors.lastname: Jiang
authors.forename: Yunhui
authors.initials: Y
authors.lastname: Li
authors.forename: Wusong
authors.initials: W
authors.lastname: Wang
authors.forename: Hong
authors.initials: H
authors.lastname: Chen