中文摘要：

提出了一种基于双芯光子晶体光纤（PCF）的高灵敏度椭圆侧芯表面等离子体共振（SPR）折射率传感模型。在各向异性的完美匹配层边界条件下利用全矢量有限元法对传感器特性进行了数值仿真。研究发现：在椭圆侧芯中涂覆金属银纳米层可以实现SPR,共振峰对检测孔的折射率变化具有很高的传感灵敏度;与圆形结构相比,所提椭圆侧芯结构中的纤芯基模和金属表面等离子体激元（SPP）模式更易实现相位匹配;当椭圆率为0.7时,灵敏度在1.45~1.50的折射率范围内可达10412nm·RIU~（-1）,且传感曲线线性度高;椭圆侧芯结构能够有效抑制高阶SPP模式,避免基模与多个SPP模式耦合形成干扰。

英文摘要：

A model of refractive index sensing with high sensitivity elliptic side core surface plasmon resonance（SPR）based on dual-core photonic crystal fiber（PCF）is proposed.Properties of a sensor are analyzed by the full vector finite element method with the boundary condition of anisotropic perfectly matched layer.Results show that SPR can be realized in elliptic side core coated with silver nano-layer,and the resonance peak is highly sensitive to the changing refractive index of inspection hole.Compared with that of the circular structure,the phase matching between the fundamental mode of fiber core and the metal surface plasmon polariton（SPP）mode of the elliptic side core structure is easier to implement.When the ellipticity is 0.7,a sensitivity of 10412nm·RIU~（-1） in a refractive index range from 1.45 to 1.50 can be obtained,and the sensing curve has high linearity.In addition,the elliptic side core structure can effectively restrain the high-order SPP mode.The interference introduced by the coupling between fundamental mode and many SPP modes can be avoided.