Lu, C. C. et al. An actively ultrafast tunable giant slow-light effect in ultrathin nonlinear metasurfaces. Light: Science & Applications, 4, e302 (2015).
DOI:
Lu, C. C. et al. An actively ultrafast tunable giant slow-light effect in ultrathin nonlinear metasurfaces. Light: Science & Applications, 4, e302 (2015). DOI: 10.1038/lsa.2015.75.
An actively ultrafast tunable giant slow-light effect in ultrathin nonlinear metasurfaces
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.
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