Lan Xinwei, Cheng Baokai, Yang Qingbo, Huang Jie, Wang Hanzheng, Ma Yinfa, Shi Honglan, Xiao Hai
Department of Electrical and Computer Engineering, Clemson University, Clemson, South Carolina, 29634, USA.
Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri, 65409, USA.
Sens Actuators B Chem. 2014 Mar 31;193:95-99. doi: 10.1016/j.snb.2013.11.046.
Fiber optic probes for chemical sensing based on the extraordinary optical transmission (EOT) phenomenon are designed and fabricated by perforating subwavelength hole arrays on the gold film coated optical fiber endface. The device exhibits a red shift in response to the surrounding refractive index increases with high sensitivity, enabling a reflection-based refractive index sensor with a compact and simple configuration. By choosing the period of hole arrays, the sensor can be designed to operate in the near infrared telecommunication wavelength range, where the abundant source and detectors are available for easy instrumentation. The new sensor probe is demonstrated for refractive index measurement using refractive index matching fluids. The sensitivity reaches 573 nm/RIU in the 1.333~1.430 refractive index range.
基于超常光学传输（EOT）现象的用于化学传感的光纤探头，是通过在涂覆有金膜的光纤端面上打孔形成亚波长孔阵列来设计和制造的。该器件在响应周围折射率增加时呈现红移，具有高灵敏度，从而成为一种结构紧凑且简单的基于反射的折射率传感器。通过选择孔阵列的周期，该传感器可设计为在近红外通信波长范围内工作，在此波长范围内有丰富的光源和探测器，便于仪器化操作。使用折射率匹配液对新型传感器探头进行了折射率测量演示。在1.333至1.430的折射率范围内，灵敏度达到573 nm/RIU。
