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Design of an Efficient Fabry-Perot Biosensor Using High-Contrast Slanted Grating Couplers on a Dual-Core Single-Mode Optical Fiber Tip
IEEE Sensors Journal ( IF 4.3 ) Pub Date : 2021-07-26 , DOI: 10.1109/jsen.2021.3099559
Fatemeh Fouladi Mahani , Morteza Maleki , Arash Mokhtari , Pierre Berini

A novel and efficient Fabry-Perot biosensor on the tip of a dual-core single-mode optical fiber is proposed. The incident light emerges from one of the cores and is coupled to the second core via high-contrast silicon nitride slanted grating couplers (SGCs), separated by a silicon nitride waveguide segment disposed along the fiber tip. The challenges in designing high-contrast SGCs of very short length were overcome using an efficient analytical design approach augmented by simulations in 2D, resulting in grating designs that produce core-to-core coupling efficiencies of up to 29%. The waveguide segment separating the SGCs acts as a Fabry-Perot sensing cavity producing narrow Fabry-Perot fringes in the transmittance spectrum of the structure. Monitoring these fringes leads to bulk sensitivity and figure of merit of 50 – 100 nm/RIU and 16.67 – 33.34 (RIU $^{-1}$ ), for sensing a large range of biomaterials. The structure operates in transmission, thus eliminating the need to separate the reflected light from the incident light at the input of the fiber, which simplifies the interrogation system. Properly packaged, the fiber tip can be dipped or inserted directly into the sensing medium, which removes the need for microfluidics. The scheme enables robust, flexible, compact, and remotely-interrogated biosensors.

中文翻译:

在双芯单模光纤尖端上使用高对比度倾斜光栅耦合器的高效法布里-珀罗生物传感器的设计

提出了一种新型高效的双芯单模光纤尖端法布里-珀罗生物传感器。入射光从纤芯之一出射,并通过高对比度氮化硅倾斜光栅耦合器 (SGC) 耦合到第二纤芯,该耦合器由沿光纤尖端设置的氮化硅波导段隔开。使用通过 2D 模拟增强的高效分析设计方法克服了设计非常短长度的高对比度 SGC 的挑战,从而产生了可产生高达 29% 的核心到核心耦合效率的光栅设计。分隔 SGC 的波导段充当 Fabry-Perot 传感腔,在结构的透射光谱中产生窄的 Fabry-Perot 条纹。监测这些条纹导致体积灵敏度和品质因数为 50 – 100 nm/RIU 和 16.67 – 33。 $^{-1}$ ),用于感应大范围的生物材料。该结构在传输中运行,因此无需在光纤输入端将反射光与入射光分离,从而简化了询问系统。正确包装后,光纤尖端可以浸入或直接插入传感介质,无需微流体。该方案实现了稳健、灵活、紧凑和远程询问的生物传感器。
更新日期:2021-09-17
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