Fabrication and Applications of High Quality Wet etched Tapered Fiber Probes

• Main Author: 郭惠玲
• Other Authors: 魏培坤
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/30437386169883535151

碩士 === 國立海洋大學 === 光電科學研究所 === 91 === We present a new wet-etching method for making optical fiber probe with nanometer tip, large cone angle and smooth surface. This new method uses the internal capillarity in a plastic tube. The fiber is etched form the end of the optical fiber. We call it ”End-etching Method“. The key feature of this technique is that internal capillarity is steadier than external meniscus. It will not be influenced by outside factors, and was not restricted within types of the optical fibers. Our end-etching method can make tapered optical fiber probes with smoother surface than other wet-etching methods. Moreover, due to the internal capillarity is changed with the temperature, we can increase the cone angle by simply elevating the temperature. Fifty degrees of cone angle is attained through our results of this experiment. The cone-optical fiber probe can be used as near-field optical probe. Furthermore, we found the probe also can be applied to the refractive index measurement. According to our experimental results, the accuracy of refractive index is ~ . We applied it into the measurement of evaporation rate of salt water (5%). In ambient condition, the water evaporation rate is ~0.2 /min.