  We propose a novel bio-sensor structure composed of slot dual-micro-ring
resonators and mono-layer graphene.Based on the electromagnetically induced
transparency (EIT)-like phenomenon and the light-absorption characteristics of
graphene,we present a theoretical analysis of transmission by using the coupled
mode theory and Kubo formula.The results demonstrate the EIT-like spectrum with
asymmetric line profile.The mode-field distributions of transmission spectrum
obtained from 3D simulations based on finite-difference time-domain (FDTD)
method.Our bio-sensor exhibit theoretical sensitivity of 330nm/RIU, a minimum
detection limit of 3600RIU,the maximum extinction ratio of 4.4dB,the quality
factor of 1288 and a compact structure of 15um*10um.Finally, the bio-sensor's
performance is simulated for glucose solution.Our proposed design provide a
promising candidate for on-chip integration with other silicon photonic
element.
