Chemical etching of optical fibre tips - experiment and model
Chemical etching of optical fibre tips - experiment and model
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DOI：
10.1016/s0304-3991(00)00069-3
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发表时间：
2000-12-01
期刊：
影响因子：
2.2
通讯作者：
Dawson, P
中科院分区：
文献类型：
--
作者：
Puygranier, BAF;Dawson, P
讨论了用于光学扫描探针显微镜的化学蚀刻纤维尖端的形成。对于在大量的HF缓冲溶液中解理的纤维端形成的尖端，发现其形态特征(尖端高度、锥角)强烈地依赖于温度和腐蚀剂组成。用一个简单的模型分析和解释了针尖的形成过程，在该模型中，唯一相关的物理参数是纤维芯直径和纤维芯和包层的蚀刻速率。对于体积比为1：1：X(X=2、4和6)的去离子水：50%HF酸：40%NH4F的蚀刻液，在单独的实验中确定了作为温度(在24-50℃范围内)的函数的蚀刻速率，并在模型中用于正确地描述实验的尖端锥角。该模型被成功地扩展到在正常的、正的尖端结构中开始的有趣的负尖端形成的情况。相比之下，裸纤维/腐蚀剂/有机溶剂体系的半月面区域的尖端形成与腐蚀剂的组成和温度无关。(C)2000 Elsevier Science B.V.保留所有权利。
The formation of chemically etched fibre tips for use in optical scanning probe microscopy is addressed. For tips formed at a cleaved fibre end in the bulk of a buffered HF acid solution the morphological features (tip height, cone angle) are found to depend strongly on the temperature and etchant composition. The tip formation process is analysed and explained in terms of a simple model in which the only pertinent physical parameters are the fibre core diameter and etch rates of the fibre core and cladding. The etch rates are determined in separate experiments as a function of temperature (in the range 24-50 degreesC) for etchant solutions of de ionised water: 50% HF acid: 40% NH4F in the volume ratio 1 : 1 : X for X=2, 4 and 6, and used in the model to yield a correct description of the experimental tip cone angles. The model is successfully extended to the intriguing case of negative tip formation which initiates in a normal, positive tip structure. By contrast, tip formation in the meniscus region of a bare fibre/etchant/organic solvent system is found to be independent of etchant composition and temperature. (C) 2000 Elsevier Science B.V. All rights reserved.