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Title: | 矽核光纖的退火與耦合特性及高折射率液體感測器的應用 Characteristics of Silicon-Cored Fibers: Annealing, Coupling, and Application in Sensing High Refractive Index Liquids |
Authors: | Guan-Hung Chen 陳冠宏 |
Advisor: | 王倫(Lon-Wang) |
Keyword: | 矽核光纖,光纖抽絲,光纖退火,高數值孔徑光纖,光纖折射率感測器, silicon-cored fiber,optical fiber drawing,fiber annealing,high NA fiber,refractive index fiber sensor, |
Publication Year : | 2018 |
Degree: | 碩士 |
Abstract: | 在本論文中,我們將粉末填入玻璃管內,並以垂直抽絲法來製作矽核光纖(silicon-cored fibers)。搭配自動化的捲線器抽絲,可以成功製作出長2.5公尺的矽核光纖,其纖衣與纖核的直徑誤差值分別控制在208±8μm與26±3μm,具有良好的均一性。由能量散佈分析儀可知製作出的矽核光纖有著高純度的特性。由拉曼、X光散射儀可知矽核光纖有著高度結晶的特性。
我們使用了5W的CO2雷射,提升了10.7%的耦合能量,並搭配2mm/s的退火速度,5公分的矽核光纖每公分平均提升了 22.6 % 的傳輸能量。退火過後傳輸損耗可藉由退火減少為0.64 dB/cm。藉由退火減少矽核光纖的介面應力,使長度為3公分,直徑為9.5μm矽光纖能夠製作出來。此外,我們也量測矽核光纖的數值孔徑,由於纖核高折射率特性,矽核光纖的數值孔徑高達0.92,搭配紅外線攝影機拍攝出光輪廓,並驗證量測實驗結果。 最後我們將錐形矽光纖搭配微流道進行高折射率液體的感測,量測到了傳統玻璃錐形光纖無法量測到的高折射率範圍,其能量與折射率的靈敏度為-38.30 dB / RIU,元件對折射率的最小解析度為3.1 × 10^-3。 Silicon-cored fibers were made by using a combined techniques of powder-in-tube and vertical-drawing. Much cheaper polycrystalline Si powders substituting expensive single-crystal Si powders or Si rods were packed into a fused silica tube. Using the automatic spooling system, silicon-core fibers with a length of 2.5 meters were successfully produced. The diameter deviations of cladding and core were ±2.3μm and ±1.7μm, respectively, which shows high drawing uniformity by using the spooling system. According to energy-dispersive x-ray spectroscopy, the fabricated Si core is of highly purity. From Raman spectrum and X-Ray diffraction analysis, the silicon-cored fiber is high crystalline. We also demonstrated that a 5W CO2 laser could increase the coupling energy by 10.7% with an annealing speed of 2mm/s. The average transmission of the 5cm SCF was increased by 22.6% per centimeter. The transmission loss after annealing was reduced to 0.64 dB/cm. And the interface stress of the SCF was reduced by laser annealing, in such a way that a 3 cm silicon fiber could be fabricated. In addition, we also measured the NA of the SCF. Due to the high RI of the silicon, the NA of the SCF was as high as 0.92. The optical profile was taken by an infrared camera, and the experimental results were verified. Finally, we used a tapered silicon fiber based on microfluidic channel to detect the high-refractive-index liquid. The highest refractive index of 1.475 could be measured, which is impossibly obtain by using a traditional silica tapered fiber. The refractive index sensor had sensitivity about -38.30 dB / RIU, the minimum resolution is 3.1 × 10^-3 RIU. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/72380 |
DOI: | 10.6342/NTU201803231 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 光電工程學研究所 |
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ntu-107-1.pdf Restricted Access | 4.92 MB | Adobe PDF |
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