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Self-Imaging Effect in Liquid-Filled Hollow-Core Capillary Waveguide for Sensing Applications

机译：液体填充空心磁芯波导在传感应用中的自成像效应

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摘要

A high sensitivity fiber-optic sensor based on self-imaging effect in a hollow-core capillary waveguide (HCCW) is presented for sensing applications. The sensor is composed of a section of HCCW fusion spliced between single mode fibers (SMFs). The self-imaging effect in the HCCW is investigated with different fiber lengths and arc-fusion parameters. By infiltrating the hollow core with index matching liquids, the peak wavelength of the proposed device shifts towards longer wavelengths. The temperature and refractive index (RI) responses of the sensor are studied systematically. When temperature is increased from 25 °C to 75 °C, the temperature sensitivity of the device can be improved significantly with the infiltrated structure, and reaches −0.49 nm/°C, compared with that of the un-filled device, which is 9.8 pm/°C. For the RI response, the liquid-filled structure achieves sensitivity of 12,005 nm/RIU in the range between 1.448 and 1.450, slightly higher than the 11,920 nm/RIU achieved by the un-filled one. The proposed sensor exhibits the advantages of simple structure, high sensitivity and low cost, which may find potential applications in physical and chemical sensing.
机译：提出了一种在空心毛细管波导（HCCW）中基于自成像效应的高灵敏度光纤传感器，用于传感应用。该传感器由在单模光纤（SMF）之间拼接的一段HCCW融合组成。使用不同的光纤长度和电弧融合参数研究了HCCW中的自成像效应。通过用折射率匹配液体渗透中空芯，所提出的装置的峰值波长向更长的波长偏移。系统地研究了传感器的温度和折射率（RI）响应。当温度从25°C升至75°C时，采用浸入式结构可以显着提高设备的温度灵敏度，与未填充的设备（9.8）相比，温度灵敏度达到-0.49 nm /°C pm /℃。对于RI响应，液体填充的结构在1.448和1.450之间的范围内实现了12,005 nm / RIU的灵敏度，略高于未填充的结构所获得的11,920 nm / RIU。所提出的传感器具有结构简单，灵敏度高和成本低的优点，可以在物理和化学传感中找到潜在的应用。

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