Abstract
A compact graphene strip-ring hybrid resonator working in the mid-infrared regime is proposed as an analogue of Fano resonator or electromagnetically induced transparency. The dipolar surface plasmon resonance induced by the ring interferes with the x-polarized strip resonance forming a symmetric or asymmetric transparency window within the absorption profile. The spectral response can be modulated not only by the Fermi energy level of graphene, but also the geometry shape of the configuration. The sensitivity reaches 2450 nm/RIU and the light in the transparency window is slowed down to over 1/1090 times the speed in vacuum. The analytic analysis is in accordance with the 3D simulation results. Our compact design may have potential view in optical sensors, optical switches and light storage field.
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