Kamrunnahar Q M, Haider Firoz, Aoni Rifat Ahmmed, Mou Jannatul Robaiat, Shifa Shamsuttiyeba, Begum Feroza, Abdul-Rashid Hairul Azhar, Ahmed Rajib
Department of Electronics & Telecommunication Engineering, Rajshahi University of Engineering & Technology, Rajshahi 6204, Bangladesh.
Faculty of Engineering, Multimedia University, Cyberjaya 63100, Selangor, Malaysia.
Nanomaterials (Basel). 2022 Apr 23;12(9):1444. doi: 10.3390/nano12091444.
A dual-channel propagation controlled photonic crystal fiber (PCF)-based plasmonic sensor was presented to detect multiple analytes simultaneously. Plasmonic micro-channels were placed on the outer surface of the PCF, which facilitates an easy sensing mechanism. The sensor was numerically investigated by the finite element method (FEM) with the perfectly matched layer (PML) boundary conditions. The proposed sensor performances were analyzed based on optimized sensor parameters, such as confinement loss, resonance coupling, resolution, sensitivity, and figure of merit (FOM). The proposed sensor showed a maximum wavelength sensitivity (WS) of 25,000 nm/refractive index unit (RIU) with a maximum sensor resolution (SR) of 4.0 × 10 RIU for channel 2 (Ch-2), and WS of 3000 nm/RIU with SR of 3.33 × 10 RIU for channel 1 (Ch-1). To the best of our knowledge, the proposed sensor exhibits the highest WS compared with the previously reported multi-analyte based PCF surface plasmon resonance (SPR) sensors. The proposed sensor could detect the unknown analytes within the refractive index (RI) range of 1.32 to 1.39 in the visible to near infrared region (550 to 1300 nm). In addition, the proposed sensor offers the maximum Figure of Merit (FOM) of 150 and 500 RIU with the limit of detection (LOD) of 1.11 × 10 RIU/nm and 1.6 × 10 RIU/nm for Ch-1 and Ch-2, respectively. Due to its highly sensitive nature, the proposed multi-analyte PCF SPR sensor could be a prominent candidate in the field of biosensing to detect biomolecule interactions and chemical sensing.
提出了一种基于双通道传播控制光子晶体光纤（PCF）的表面等离子体共振传感器，用于同时检测多种分析物。表面等离子体微通道置于光子晶体光纤外表面，简化了传感机制。采用有限元法（FEM）和完全匹配层（PML）边界条件对该传感器进行了数值研究。基于优化的传感器参数，如限制损耗、共振耦合、分辨率、灵敏度和品质因数（FOM），分析了所提传感器的性能。所提传感器在通道2（Ch-2）处的最大波长灵敏度（WS）为25000 nm/折射率单位（RIU），最大传感器分辨率（SR）为4.0×10 RIU；通道1（Ch-1）处的WS为3000 nm/RIU，SR为3.33×10 RIU。据我们所知，与先前报道的基于多分析物的光子晶体光纤表面等离子体共振（SPR）传感器相比，所提传感器具有最高的WS。所提传感器能够在可见光至近红外区域（550至1300 nm）内检测折射率（RI）范围为1.32至1.39的未知分析物。此外，所提传感器通道1和通道2的品质因数（FOM）最大值分别为150和500 RIU，检测限（LOD）分别为1.11×10 RIU/nm和1.6×10 RIU/nm。由于其高灵敏度特性，所提多分析物光子晶体光纤表面等离子体共振传感器在生物传感领域检测生物分子相互作用和化学传感方面可能是一个突出的候选者。
