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银纳米颗粒与光子晶体光纤、表面增强拉曼散射效应结合而成的PCF SERS传感器得到了科研界的广泛关注。而PCF结构、SERS基底的性能是传感器的重要影响因素。为了进一步提高SERS PCF传感器的性能,通过研究对比PCF和SERS基底结构参数对传感性能的影响,设计出适用于PCF SERS传感的空芯PCF以及SERS基底的结构参数。通过数值计算,设计的空芯PCF空气填充率为56.30%,当激发光波长785 nm时存在光子带隙,并能够实现单模传输。而半径为38 nm的银纳米球在间距为0.7 nm时能够产生最大的SERS增强因子。研究证明,设计的空芯PCF在785 nm输入波长下既能够基模传输激发光,又能够为SERS提供理想的活性面积,而且银纳米颗粒的形状、尺寸、间距对SERS性能影响严重,而且与入射波长有很强的依赖关系。
PCF SERS sensors made of silver nanoparticles and photonic crystal fibers and surface-enhanced Raman scattering effect have drawn much attention from the scientific community. The PCF structure, SERS substrate performance sensor is an important factor. In order to further improve the performance of SERS PCF sensor, the structural parameters of hollow PCF and SERS substrate suitable for PCF SERS sensing were designed by comparing the influence of PCF and SERS structure parameters on the sensing performance. The numerical calculation shows that the designed air-filled PCF air-filled rate is 56.30%. When the excitation wavelength is 785 nm, there is a photonic bandgap and single-mode transmission can be achieved. However, silver nanospheres with a radius of 38 nm produce the largest SERS enhancement factor at a spacing of 0.7 nm. The results show that the hollow core PCF designed at the wavelength of 785 nm can not only transmit the excitation light in the fundamental mode, but also provide the ideal active area for the SERS. Moreover, the shape, size and spacing of silver nanoparticles have a serious impact on the SERS performance, The incident wavelength has a strong dependence.