Chaigneau M, Balaa K, Minea T, Louarn G
Institut des Matériaux Jean Rouxel, UMR 6502, CNRS-Université de Nantes, BP 2229, 44322 Nantes, France.
Opt Lett. 2007 Aug 15;32(16):2435-7. doi: 10.1364/ol.32.002435.
Microscale fiber tip sensors based on the plasmon resonance are reported. The fabrication process derived from our previous approach for manufacturing near-field scanning optical microscopy probes has been optimized for sensing applications. A typical tip sensor is a tapered fiber 400 microm in length, coated with a nanoporous thin silver film. The miniaturized geometry of the sensor allows detection in a single droplet of liquid solution (approximately 20 microl). The tip sensor is sensitive for refractive indices between 1.33 and 1.40 with a sensitivity of at least 3 x 10(-4) refractive index unit (RIU)/nm. The Raman scattering enhancement through these microsensors demonstrates the important role played by the localized plasmon resonance. The sensors' linear response covers a large region, interesting for biosensing in aqueous environments such as biomedical applications.
报道了基于等离子体共振的微尺度光纤尖端传感器。源自我们先前制造近场扫描光学显微镜探针的方法的制造工艺已针对传感应用进行了优化。典型的尖端传感器是一根长度为400微米的锥形光纤，涂有纳米多孔薄银膜。传感器的小型化几何结构允许在单滴液体溶液（约20微升）中进行检测。尖端传感器对折射率在1.33至1.40之间敏感，灵敏度至少为3×10^(-4) 折射率单位（RIU）/纳米。通过这些微传感器的拉曼散射增强证明了局域等离子体共振所起的重要作用。传感器的线性响应覆盖了很大的区域，这对于诸如生物医学应用等水性环境中的生物传感很有意义。
