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Opt Express. 2012 Mar 26;20(7):7206-11. doi: 10.1364/OE.20.007206.

Transparency window for the absorptive dipole resonance in a symmetry-reduced grating structure.

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  • 1Physics Department, Southeast University, Nanjing 211189, China.


We demonstrate that a transparency window can be obtained within the absorptive dipole resonant regime, by slightly reducing the symmetric arrangement of a dipole-like bar grating covered by a waveguiding layer. The physical understanding is that, under the condition of reducing the grating symmetry, the lossy dipole plasmon resonance can be completely transferred into the waveguide mode in a way of destructive interference. In accompany with the tunable transparency window modulated by the symmetry-reduced displacement, an ultra high group index (slowing down the light) as well as a vortex distribution of the electromagnetic field is found.

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