In this paper, a four open channel dual-core photonic crystal fiber (OC-DC-PCF) refractive index (RI) sensor is numerically investigated by finite element method (FEM) based software for the detection of unknown biomolecules. To create the surface plasmon resonance (SPR) effect, novel plasmonic material gold (Au) is externally deposited to the selected slotted region which makes this design cost-effective. We obtain the maximum wavelength sensitivity (WS) 38000 nm/RIU and the amplitude sensitivity (AS) of 1286 RIU⁻¹ by using wavelength and amplitude interrogation method respectively. The average spectral sensitivity is 6308 nm/RIU. The maximum figure of merit (FOM) of 760 RIU along with the maximum sensor resolution of 2.63×10⁻⁶ RIU is achieved within the analyte RI range of 1.33 to 1.45 for this design which is better than the reported existing works. According to its high sensitivity and cost-effective nature, large detection range, high linearity and FOM, low propagation loss, and low fabrication complexity- it can be an appreciable competitor in the region of bio sensing. The proposed sensor can detect successfully the biomolecules like water, ethanol, fused silica, silicone oil, kerosene, acetone, glucose solution, Teflon, cornea, lens, liver and intestinal mucosa of human etc.

中文翻译：

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双核四开通道圆缝金涂层等离子体生物传感器

本文通过基于有限元方法（FEM）的软件，对四通道双芯光子晶体光纤（OC-DC-PCF）折射率（RI）传感器进行了数值研究，以检测未知生物分子。为了产生表面等离子体共振（SPR）效果，新型等离子体材料金（Au）从外部沉积到选定的开槽区域，这使该设计具有成本效益。我们分别通过波长和幅度询问法获得最大波长灵敏度（WS）38000 nm / RIU和振幅灵敏度（AS）1286 RIU ^-1。平均光谱灵敏度为6308 nm / RIU。760 RIU的优值（FOM）的最大数字与2.63×10的最大传感器分辨率沿着^{- 6}对于此设计，在分析物的RI范围为1.33至1.45的范围内实现了RIU，这优于已报道的现有工作。由于其高灵敏度和高性价比的特性，大的检测范围，高的线性和FOM，低的传播损耗和低的制造复杂性，它可以成为生物传感领域的重要竞争者。所提出的传感器可以成功地检测到人类的水，乙醇，熔融二氧化硅，硅油，煤油，丙酮，葡萄糖溶液，聚四氟乙烯，角膜，晶状体，肝脏和肠粘膜等生物分子。