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Noncontact characterization of microstructured optical fibers coating in real time
Optics Letters ( IF 3.6 ) Pub Date : 2021-09-23 , DOI: 10.1364/ol.433208
Timur Ermatov , Ivan Gnusov , Julia Skibina , Roman Noskov , Dmitry Gorin

Functional nanocoatings have allowed hollow-core microstructured optical fibers (HC-MOFs) to be introduced into biosensing and photochemistry applications. However, common film characterization tools cannot evaluate the coating performance in situ. Here we report the all-optical noncontact characterization of the HC-MOF coating in real time. Self-assembled multilayers consisting of inversely charged polyelectrolytes (PEs) are deposited on the HC-MOF core capillary, and a linear spectral shift in the position of the fiber transmission minima with increasing the film thickness is observed as small as ${\sim} {1.5 - 6}\;{\rm nm}$ per single PE bilayer. We exemplify the practical performance of our approach by registering an increase in the coating thickness from ${6} \pm {1}$ to ${11} \pm {1}\;{\rm nm}$ per PE bilayer with increasing ionic strength in the PE solutions from 0.15 to 0.5 M NaCl. Additionally, we show real-time monitoring of pH-induced coating dissolving. Simplicity and high sensitivity make our approach a promising tool allowing noncontact analysis of the HC-MOF coating which is still challenging for other methods.

中文翻译:

微结构光纤涂层的实时非接触表征

功能性纳米涂层允许将空心微结构光纤 (HC-MOF) 引入生物传感和光化学应用。然而,常见的薄膜表征工具无法原位评估涂层性能。在这里,我们实时报告了 HC-MOF 涂层的全光学非接触表征。由带相反电荷的聚电解质 (PE) 组成的自组装多层膜沉积在 HC-MOF 核心毛细管上,随着薄膜厚度的增加,观察到光纤传输最小值位置的线性光谱偏移小至${\sim} {1.5 - 6}\;{\rm nm}$每单个 PE 双层。我们通过记录涂层厚度的增加来举例说明我们方法的实际性能${6} \pm {1}$${11} \pm {1}\;{\rm nm}$每 PE 双层,PE 溶液中的离子强度从 0.15 到 0.5 M NaCl。此外,我们还展示了对 pH 诱导的涂层溶解的实时监测。简单性和高灵敏度使我们的方法成为一种很有前途的工具,可以对 HC-MOF 涂层进行非接触式分析,这对于其他方法仍然具有挑战性。
更新日期:2021-10-02
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