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 are obtained from 3D simulations based on finite-difference time-domain (FDTD) method. Our bio-sensor exhibits theoretical sensitivity of 330 nm/RIU, a minimum detection limit of [Formula: see text] RIU, the maximum extinction ratio of 4.4 dB, the quality factor of [Formula: see text] and a compact structure of [Formula: see text]. Finally, the bio-sensor’s performance is simulated for glucose solution. Our proposed design provides a promising candidate for on-chip integration with other silicon photonic element.

中文翻译：

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基于石墨烯嵌入槽的双微环谐振器的有效折射率生物传感器数值分析

我们提出了一种由槽双微环谐振器和单层石墨烯组成的新型生物传感器结构。基于类电磁感应透明（EIT）现象和石墨烯的吸光特性，我们利用耦合模式理论和久保公式对透射进行了理论分析。结果证明了具有不对称线轮廓的类 EIT 光谱。透射谱的模场分布是基于有限差分时域（FDTD）方法从 3D 模拟中获得的。我们的生物传感器具有 330 nm/RIU 的理论灵敏度，[公式：见文本] RIU 的最小检测限，4.4 dB 的最大消光比，[公式：见文本]的品质因数和 [公式：见文本] 的紧凑结构公式：见正文]。最后，针对葡萄糖溶液模拟了生物传感器的性能。我们提出的设计为与其他硅光子元件的片上集成提供了有希望的候选者。