Numerical analysis of effective refractive index bio-sensor based on graphene-embedded slot-based dual-micro-ring resonator

TL;DR

This paper introduces a novel graphene-embedded dual-micro-ring resonator biosensor leveraging EIT-like phenomena, demonstrating high sensitivity and compact design for on-chip biochemical detection.

Contribution

The study presents a new biosensor design combining slot dual-micro-ring resonators with graphene, analyzed through coupled mode theory and FDTD simulations, showing enhanced sensing performance.

Findings

Sensitivity of 330 nm/RIU

Detection limit of 3600 RIU

Maximum extinction ratio of 4.4 dB

Abstract

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.