An efficient method is proposed to extend the bandwidth of a metamaterial absorber with multi-resonance structure.The basic unit cell of a metamaterial absorber consists of the electric ring resonator,dielectric subst...An efficient method is proposed to extend the bandwidth of a metamaterial absorber with multi-resonance structure.The basic unit cell of a metamaterial absorber consists of the electric ring resonator,dielectric substrate(FR-4)and split-wire.By assembling five sandwiched structures with different geometric dimensions into a unit cell,we obtain the superposition of five different absorption peaks.Finally the bandwidth of metamaterial absorption is extended and the full width at half maximum is up to 1.3 GHz.The simulated and experimental results are consistent.展开更多
The statics characteristics of two coupled Bose-Einstein condensate (BEC) dark solitons trapped in an optical lattice are investigated with the variational approach.It is found that the interaction between a ‘kink’ ...The statics characteristics of two coupled Bose-Einstein condensate (BEC) dark solitons trapped in an optical lattice are investigated with the variational approach.It is found that the interaction between a ‘kink’ and an ‘anti-kink’ with opposite phase gradients is effectively repulsive, and the optical lattice can be controllably used to produce a pair of static BEC dark solitons.Its effect depends on the initial location of the BEC dark solitons, the lattice amplitude and wave number.展开更多
基金Supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant No 20090142120003.
文摘An efficient method is proposed to extend the bandwidth of a metamaterial absorber with multi-resonance structure.The basic unit cell of a metamaterial absorber consists of the electric ring resonator,dielectric substrate(FR-4)and split-wire.By assembling five sandwiched structures with different geometric dimensions into a unit cell,we obtain the superposition of five different absorption peaks.Finally the bandwidth of metamaterial absorption is extended and the full width at half maximum is up to 1.3 GHz.The simulated and experimental results are consistent.
基金Supported by the Science and Technology Programof EducationDepartment of Hubei Province under Grant No.B20052202 ,andthe Fund of Natural Science of Hubei Province under Grant No.2004ABA112
文摘The statics characteristics of two coupled Bose-Einstein condensate (BEC) dark solitons trapped in an optical lattice are investigated with the variational approach.It is found that the interaction between a ‘kink’ and an ‘anti-kink’ with opposite phase gradients is effectively repulsive, and the optical lattice can be controllably used to produce a pair of static BEC dark solitons.Its effect depends on the initial location of the BEC dark solitons, the lattice amplitude and wave number.
