We introduce a microfluidic refractive index sensor based on a directional coupler architecture using solid-core photonic crystal fibers. The sensor achieves very high sensitivity by coupling the core mode to a mode in the adjacent fluid-filled waveguide that is beyond modal cutoff, and with strong field overlap. We demonstrate the device through the selective infiltration of a single hole with fluid along a microstructured optical fiber. A detection limit of 4.6 X 10~(-7) refractive index units has been derived from measurements with a sensitivity of 30,100 nm per refractive index unit, which is the highest for a fiber device to date.
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机译：我们介绍了一种基于使用固芯光子晶体光纤的定向耦合器架构的微流折射率传感器。该传感器通过将纤芯模式耦合到相邻的充满流体的波导中超出模态截止并且具有很强的场重叠的模式来实现很高的灵敏度。我们通过沿微结构化光纤的流体选择性渗透单个孔来演示该设备。通过对每个折射率单位的灵敏度为30,100 nm的测量得出了4.6 X 10〜（-7）折射率单位的检测极限，这是迄今为止光纤设备中最高的。
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