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Refractive index sensing based on Mach-Zehnder interferometer formed by three cascaded single-mode fiber tapers

机译：基于三级联单模光纤锥度构成的Mach-Zehnder干涉仪的折射率传感

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摘要

We report a highly sensitive refractive index (RI) sensor based on three cascaded single-mode fiber tapers, in which a weak taper is sandwiched between the two tapers to improve the sensitivity of the sensor. Experimental results show that the sensitivity of the device is 0.286 nm for a 0.01 RI change, which is about four times higher than that of the normal two-cascaded-taper-based Mach-Zehnder interferometer. In addition, the sensitivity of the device could be enhanced by tapering a longer and thinner middle weak taper. Such kinds of low-cost and highly sensitive fiber-optic RI sensors would find applications in chemical or biochemical sensing fields.
机译：我们报告了基于三个级联的单模光纤锥度的高灵敏度折射率（RI）传感器，其中在两个锥度之间夹有一个弱锥度，以提高传感器的灵敏度。实验结果表明，对于0.01 RI的变化，该器件的灵敏度为0.286 nm，这比基于两级锥形的常规Mach-Zehnder干涉仪的灵敏度高约四倍。另外，可以通过逐渐变细和变细的中间弱锥度来提高器件的灵敏度。这类低成本和高灵敏度的光纤RI传感器将在化学或生化传感领域中找到应用。

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