基于聚合物材料涂敷的微纳光纤低损耗连接及器件组装方法研究
发布时间：2019-04-12 16:53
【摘要】：微纳光纤是将传统单模光纤熔融拉锥制成的直径与波长相近的光纤,这种极细的光纤在光学和机械性能上表现出一些传统光纤无法比拟的特性。与传统光纤器件相比,微纳光纤器件不仅尺寸小巧,在构成方式上也非常灵活,通过弯曲、扭转、缠绕、排布等方式对微纳光纤的空间几何结构进行操控,能够构成多种小巧的光子器件。若能将这些器件有效连接在一起,将为多功能微纳光学平台和未来的微纳光子集成的实现提供可行途径。要想实现这一目标,解决微纳光纤之间的低损耗连接和器件的高效组装是关键环节,然而,现有的连接和组装方法面临着连接损耗高、操作复杂、机械强度低等诸多缺点,不利于器件的进一步集成。为了解决以上问题,本文提出基于一种低折射率聚合物材料——高取代羟丙基纤维素涂敷的微纳光纤低损耗、高机械强度的连接技术,进而将该技术推广用于微纳光纤器件的高效组装。本文主要开展了以下几方面工作:首先在理论上阐述了微纳光纤的倏逝场耦合理论。本文将弱导近似下的的倏逝场定向耦合理论推广到强波导情况,理论研究表明,聚合物涂敷在维持原有光纤折射率引导基本特性的同时重构了光纤模场分布,对两根平行紧贴的微纳光纤进行涂敷,相当于使两个强波导互相交叠,从而增加耦合效率,提高了耦合强度,为我们在实验上低损耗连接和器件组装的实现奠定了理论基础。第二部分提出了高取代羟丙基纤维素涂敷技术实现方法,通过材料优选与参数优化,探索出一套涂敷工艺流程。基于这一技术,实现了微纳光纤之间的低损耗连接,最小平均连接损耗约为0.26d B。连接点具有较高的机械强度,能够承受高达1N的轴向拉力。第三部分基于聚合物涂敷技术实现了多种微纳光纤器件的组装。这一方法能够稳定保持器件原有的光学结构,基于聚合物涂敷技术实现了环形谐振腔、Sagnac干涉仪、F-P谐振腔及Mach-Zehnder干涉仪等多种微纳光纤器件。经测试,采用聚合物涂敷技术组装的器件能够在20天内保持稳定的光学性能。同时,由于采用的涂敷材料具有比石英更低的折射率,能够保持微纳光纤的倏逝场特性,以微纳光纤Sagnac干涉仪折射率传感器为例,其折射率灵敏度达到2600nm/RIU。最后对本论文完成的研究工作进行总结,并对未来的工作做出展望。本文中提出的微纳光纤连接与微纳光纤器件组装方法,在实现微纳光纤低损耗连接的同时又保证了微纳光纤结构的稳定性与功能稳定性。此外还具有操作简单,流程简洁等优点,能够实现对连接和组装过程的实时监测,在自由空间内进行多角度全方位灵活操作。本文工作将有助于推动微纳光纤光学器件向集成化芯片化方向发展。
[Abstract]:Micro / nano fiber is a kind of fiber which has the same diameter and wavelength as the traditional single mode fiber. This kind of micro / nano fiber exhibits some characteristics which can not be compared with the traditional fiber in optical and mechanical properties. Compared with traditional optical fiber devices, micro / nano fiber devices are not only small in size, but also very flexible in composition, and control the spatial geometry of micro / nano fibers by means of bending, torsion, winding and arrangement, etc. Can form a variety of small photonic devices. If these devices can be connected together effectively, it will provide a feasible way for the realization of multi-functional micro / nano optical platform and future micro / nano photon integration. In order to achieve this goal, solving the low loss connection between micro / nano fibers and the efficient assembly of devices is the key link. However, the existing connection and assembly methods face many shortcomings, such as high connection loss, complex operation, low mechanical strength, and so on. It is not conducive to the further integration of the device. In order to solve the above problems, a low loss, high mechanical strength bonding technique based on a low refractive index polymer material, high substituted hydroxypropyl cellulose (HPC) coating, is proposed in this paper. Furthermore, this technology is applied to the high efficiency assembly of micro / nano fiber devices. The main work of this paper is as follows: firstly, the evanescent field coupling theory of micro / nano fiber is described theoretically. In this paper, the evanescent field directional coupling theory under weak conduction approximation is extended to the case of strong waveguide. The theoretical study shows that polymer coating reconstructs the mode field distribution of the fiber while maintaining the basic characteristics of the refractive index guidance of the original fiber. The coating of two parallel micro / nano optical fibers is equivalent to overlapping the two strong waveguides, thus increasing the coupling efficiency and increasing the coupling strength, which lays a theoretical foundation for the realization of low loss connection and device assembly in experiments. In the second part, the realization method of high substituted hydroxypropyl cellulose coating technology is put forward. Through the optimization of materials and parameters, a set of coating process is explored. Based on this technique, the low loss connection between micro / nano fibers is realized, and the minimum average connection loss is about 0.26 dB. The connection point has high mechanical strength and can withstand up to 1N axial tension. In the third part, many kinds of micro / nano fiber devices are assembled based on polymer coating technology. This method can keep the original optical structure of the device stably. Based on polymer coating technology, many micro / nano fiber devices, such as ring resonator, Sagnac interferometer, FIP resonator and Mach-Zehnder interferometer, have been realized. It has been tested that the devices assembled by polymer coating technology can maintain stable optical properties within 20 days. At the same time, because the coating material has lower refractive index than quartz, the evanescent field of micro / nano fiber can be maintained. Taking the refractive index sensor of micro / nano fiber Sagnac interferometer as an example, the refractive index sensitivity of the coating material is up to 2 600 nm. Finally, the research work completed in this paper is summarized, and the future work is prospected. The method of micro / nano fiber connection and micro / nano fiber device assembly proposed in this paper not only realizes the low loss connection of micro / nano fiber, but also guarantees the stability and function stability of micro / nano fiber structure. In addition, it has the advantages of simple operation and simple flow, so it can realize real-time monitoring of connection and assembly process, and carry out multi-angle and all-round flexible operation in free space. The work in this paper will help to promote the development of micro-/ nano-fiber optical devices into integrated chipsets.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
本文编号：2457200
[Abstract]:Micro / nano fiber is a kind of fiber which has the same diameter and wavelength as the traditional single mode fiber. This kind of micro / nano fiber exhibits some characteristics which can not be compared with the traditional fiber in optical and mechanical properties. Compared with traditional optical fiber devices, micro / nano fiber devices are not only small in size, but also very flexible in composition, and control the spatial geometry of micro / nano fibers by means of bending, torsion, winding and arrangement, etc. Can form a variety of small photonic devices. If these devices can be connected together effectively, it will provide a feasible way for the realization of multi-functional micro / nano optical platform and future micro / nano photon integration. In order to achieve this goal, solving the low loss connection between micro / nano fibers and the efficient assembly of devices is the key link. However, the existing connection and assembly methods face many shortcomings, such as high connection loss, complex operation, low mechanical strength, and so on. It is not conducive to the further integration of the device. In order to solve the above problems, a low loss, high mechanical strength bonding technique based on a low refractive index polymer material, high substituted hydroxypropyl cellulose (HPC) coating, is proposed in this paper. Furthermore, this technology is applied to the high efficiency assembly of micro / nano fiber devices. The main work of this paper is as follows: firstly, the evanescent field coupling theory of micro / nano fiber is described theoretically. In this paper, the evanescent field directional coupling theory under weak conduction approximation is extended to the case of strong waveguide. The theoretical study shows that polymer coating reconstructs the mode field distribution of the fiber while maintaining the basic characteristics of the refractive index guidance of the original fiber. The coating of two parallel micro / nano optical fibers is equivalent to overlapping the two strong waveguides, thus increasing the coupling efficiency and increasing the coupling strength, which lays a theoretical foundation for the realization of low loss connection and device assembly in experiments. In the second part, the realization method of high substituted hydroxypropyl cellulose coating technology is put forward. Through the optimization of materials and parameters, a set of coating process is explored. Based on this technique, the low loss connection between micro / nano fibers is realized, and the minimum average connection loss is about 0.26 dB. The connection point has high mechanical strength and can withstand up to 1N axial tension. In the third part, many kinds of micro / nano fiber devices are assembled based on polymer coating technology. This method can keep the original optical structure of the device stably. Based on polymer coating technology, many micro / nano fiber devices, such as ring resonator, Sagnac interferometer, FIP resonator and Mach-Zehnder interferometer, have been realized. It has been tested that the devices assembled by polymer coating technology can maintain stable optical properties within 20 days. At the same time, because the coating material has lower refractive index than quartz, the evanescent field of micro / nano fiber can be maintained. Taking the refractive index sensor of micro / nano fiber Sagnac interferometer as an example, the refractive index sensitivity of the coating material is up to 2 600 nm. Finally, the research work completed in this paper is summarized, and the future work is prospected. The method of micro / nano fiber connection and micro / nano fiber device assembly proposed in this paper not only realizes the low loss connection of micro / nano fiber, but also guarantees the stability and function stability of micro / nano fiber structure. In addition, it has the advantages of simple operation and simple flow, so it can realize real-time monitoring of connection and assembly process, and carry out multi-angle and all-round flexible operation in free space. The work in this paper will help to promote the development of micro-/ nano-fiber optical devices into integrated chipsets.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
【参考文献】
相关期刊论文 前3条
1 庞冬梅;林东生;窦庆萍;;羟丙基纤维素/壳聚糖共混膜的制备与性能[J];高分子材料科学与工程;2013年01期
2 张伟;朱林;李青松;朱新生;俞波;刘兆峰;;羟丙基纤维素的微观结构和溶解性及再生[J];高分子材料科学与工程;2013年07期
3 武建芬;陈根祥;;高双折射光纤Sagnac环反射特性的JONES矩阵分析[J];激光与光电子学进展;2006年09期
，本文编号：2457200
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