Chin. Phys. B, 2008, Vol. 17(1): 164-169    DOI: 10.1088/1674-1056/17/1/029
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# Super energy flows in a waveguide filled with air and left-handed materials

Cui Tie-Juna, Yu Guan-Xiab
a Center for Computational Electromagnetics and the State Key Laboratory of Millimeter Waves,\Department of Radio Engineering, Southeast University, Nanjing 210096, China; b Center for Computational Electromagnetics and the State Key Laboratory of Millimeter Waves,\Department of Radio Engineering, Southeast University, Nanjing 210096, China\;College of Information Science and Technology, Nanjing Forestry University, Nan
Abstract  The phenomena of super energy flows are studied theoretically and numerically in a parallel-plate waveguide which is filled with two layered equally-thick different media, i.e. air and specific left-handed materials (LHM) with $\epsilon_{{\rm r}1}=-1/(1+\delta)+\i\gamma$ and $\mu_{{\rm r}1}=-(1+\delta)+\i\gamma$. In this special waveguide, two-directional super-energy flows are excited by a three-dimensional horizontal electric dipole at the same time, which has transmission patterns different from those of two-dimensional source and three-dimensional vertical electric dipole. We also show that the retardation and loss in LHM are sensitive to the amplitude of super power densities, and the dimensions of waveguide determine the propagating modes, which makes super energy flows more practical.
Published:  20 January 2008
 PACS: 84.40.Az (Waveguides, transmission lines, striplines) 41.20.Jb (Electromagnetic wave propagation; radiowave propagation)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 60671015, 60225001 and 60621002), The State Key Development Program for Basic Research of China (Grant No 2004CB719802), and the Doctorate Found of State Education Commissio