Modal Interferometer Based on a C-Shaped Ultrathin Fiber Taper for High-Sensitivity Refractive Index Measurement
Modal Interferometer Based on a C-Shaped Ultrathin Fiber Taper for High-Sensitivity Refractive Index Measurement
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DOI：
10.1143/apex.5.012502
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发表时间：
2011
影响因子：
2.3
通讯作者：
Haimei Luo;Xinwan Li;Weiwen Zou;Wenning Jiang;Jianping Chen
中科院分区：
文献类型：
--
作者：
Haimei Luo;Xinwan Li;Weiwen Zou;Wenning Jiang;Jianping Chen
将加热单模光纤绝热拉伸制成超薄光纤锥度，并将其弯曲成c型，形成模态干涉仪。在多模锥腰中，模跳动引起的干涉条纹与弯曲半径有关。在优化弯曲半径下，最大干扰深度可达18 dB。讨论了光纤锥度几何形状对干涉条纹的影响。所提出的模态干涉仪在RI= 1.333-1.353时具有高折射率（RI）灵敏度，为~ 658 nm/RIU（折射率单位），有望用于精密生物/化学传感应用。
The ultrathin fiber taper fabricated by adiabatically stretching a heated single-mode optical fiber (SMF) is made in a C-shape bent to form a modal interferometer. The interference fringes due to the mode beating in the multimode taper waist are dependent on the bending radius. Under an optimized bending radius, a maximum 18 dB interference depth can be obtained. The influence of the fiber taper geometry on the interference fringes is discussed. The proposed modal interferometer has a high refractive index (RI) sensitivity of ∼658 nm/RIU (refractive index unit) for RI= 1.333–1.353, which is expected to be useful for precision bio/chemical sensing applications.