Fabrication and Analysis of Polymer Optical Fiber Lenses

• Main Authors: Yan-Zuo Liu, 劉彥佐
• Other Authors: Fang-Wen Sheu
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/6588j4

碩士 === 國立嘉義大學 === 電子物理學系光電暨固態電子研究所 === 107 === This study experiments a simple approach to mass-produce optical fiber lenses of various bending radiuses. We first strip the plastic clad of the fiber and have its end cut smooth and even, and then carefully attach a small amount of photoresist to the end of the fiber. By heating the fiber in the oven, the photoresist solidifies and forms a curved surface attached to the end. This is called a polymer optical fiber lens. By controlling the volume of photoresist, we try to produce polymer lenses with different curvatures at the end of general optical fibers (the diameter is 125 µm), and we measure, calculate and analyze their structures. In addition, with the help of the fiber-tapering device assembled in the laboratory, we use the Bunsen burner to heat and taper the fiber, the plastic clad of which has been stripped off, to make conical fiber probes. We use the thermal evaporator to coat it with an Ag thin film of about 200 nm thick. The fiber is then cut at different locations, and we fabricate polymer optical fiber lenses of various curvatures in the same manner at the ends of tapered fiber probes of different thicknesses. We test each sample and observe optical characteristics such as focal locations and the degrees of divergence after the laser beam passes through tapered fiber probes of different thicknesses and polymer optical fiber lenses of various curvatures. Moreover, adopting the approach of numerical simulation, we also calculate and analyze the patterns of leaser beam changes after it passes through each fiber lens. In the future, we will explore various possible optical applications of tapered fiber probes with different thicknesses and polymer optical fiber lenses of various curvatures.