A slow-light effect based on metamaterial-induced transparency(MIT)possesses great practical applications for integrated photonic devices.However,to date,only very weak slow-light effects have been obtained in metamat...A slow-light effect based on metamaterial-induced transparency(MIT)possesses great practical applications for integrated photonic devices.However,to date,only very weak slow-light effects have been obtained in metamaterials because of the intrinsic loss of metal.Moreover,no active control of slow-light has been achieved in metamaterials.Here,we report the realization of a giant slow-light effect on an ultrathin metasurface that consists of periodic arrays of gold nanoprism dimers with a thickness of 40 nm sandwiched between a multilayer-graphene micro-sheet/zinc oxide nanoparticle layer and a monolayer graphene/polycrystalline indium tin oxide layer.The strong field confinement of the plasmonic modes associated with the MIT ensures a tremendous reduction in the group velocity around the transparency window.A group index of more than 4×10^(3) is achieved,which is one order of magnitude greater than that of previous reports.A large tunable wavelength range of 120 nm is achieved around the center of the transparency window when the pump light intensity is only 1.5 kW cm^(-2).The response time is as fast as 42.3 ps.These results demonstrate the potential for the realization of various functional integrated photonic devices based on metasurfaces,such as all-optical buffers and all-optical switches.展开更多
基金This work was supported by the 973 Program of China under grant nos.2013CB328704 and 2014CB921003the National Natural Science Foundation of China under grant nos.11225417,61475003,11134001,11121091,and 90921008.
文摘A slow-light effect based on metamaterial-induced transparency(MIT)possesses great practical applications for integrated photonic devices.However,to date,only very weak slow-light effects have been obtained in metamaterials because of the intrinsic loss of metal.Moreover,no active control of slow-light has been achieved in metamaterials.Here,we report the realization of a giant slow-light effect on an ultrathin metasurface that consists of periodic arrays of gold nanoprism dimers with a thickness of 40 nm sandwiched between a multilayer-graphene micro-sheet/zinc oxide nanoparticle layer and a monolayer graphene/polycrystalline indium tin oxide layer.The strong field confinement of the plasmonic modes associated with the MIT ensures a tremendous reduction in the group velocity around the transparency window.A group index of more than 4×10^(3) is achieved,which is one order of magnitude greater than that of previous reports.A large tunable wavelength range of 120 nm is achieved around the center of the transparency window when the pump light intensity is only 1.5 kW cm^(-2).The response time is as fast as 42.3 ps.These results demonstrate the potential for the realization of various functional integrated photonic devices based on metasurfaces,such as all-optical buffers and all-optical switches.
