基于聚合物材料涂敷的微納光纖低損耗連接及器件組裝方法研究
發(fā)布時(shí)間：2019-04-12 16:53
【摘要】：微納光纖是將傳統(tǒng)單模光纖熔融拉錐制成的直徑與波長(zhǎng)相近的光纖,這種極細(xì)的光纖在光學(xué)和機(jī)械性能上表現(xiàn)出一些傳統(tǒng)光纖無(wú)法比擬的特性。與傳統(tǒng)光纖器件相比,微納光纖器件不僅尺寸小巧,在構(gòu)成方式上也非常靈活,通過(guò)彎曲、扭轉(zhuǎn)、纏繞、排布等方式對(duì)微納光纖的空間幾何結(jié)構(gòu)進(jìn)行操控,能夠構(gòu)成多種小巧的光子器件。若能將這些器件有效連接在一起,將為多功能微納光學(xué)平臺(tái)和未來(lái)的微納光子集成的實(shí)現(xiàn)提供可行途徑。要想實(shí)現(xiàn)這一目標(biāo),解決微納光纖之間的低損耗連接和器件的高效組裝是關(guān)鍵環(huán)節(jié),然而,現(xiàn)有的連接和組裝方法面臨著連接損耗高、操作復(fù)雜、機(jī)械強(qiáng)度低等諸多缺點(diǎn),不利于器件的進(jìn)一步集成。為了解決以上問(wèn)題,本文提出基于一種低折射率聚合物材料——高取代羥丙基纖維素涂敷的微納光纖低損耗、高機(jī)械強(qiáng)度的連接技術(shù),進(jìn)而將該技術(shù)推廣用于微納光纖器件的高效組裝。本文主要開展了以下幾方面工作:首先在理論上闡述了微納光纖的倏逝場(chǎng)耦合理論。本文將弱導(dǎo)近似下的的倏逝場(chǎng)定向耦合理論推廣到強(qiáng)波導(dǎo)情況,理論研究表明,聚合物涂敷在維持原有光纖折射率引導(dǎo)基本特性的同時(shí)重構(gòu)了光纖模場(chǎng)分布,對(duì)兩根平行緊貼的微納光纖進(jìn)行涂敷,相當(dāng)于使兩個(gè)強(qiáng)波導(dǎo)互相交疊,從而增加耦合效率,提高了耦合強(qiáng)度,為我們?cè)趯?shí)驗(yàn)上低損耗連接和器件組裝的實(shí)現(xiàn)奠定了理論基礎(chǔ)。第二部分提出了高取代羥丙基纖維素涂敷技術(shù)實(shí)現(xiàn)方法,通過(guò)材料優(yōu)選與參數(shù)優(yōu)化,探索出一套涂敷工藝流程。基于這一技術(shù),實(shí)現(xiàn)了微納光纖之間的低損耗連接,最小平均連接損耗約為0.26d B。連接點(diǎn)具有較高的機(jī)械強(qiáng)度,能夠承受高達(dá)1N的軸向拉力。第三部分基于聚合物涂敷技術(shù)實(shí)現(xiàn)了多種微納光纖器件的組裝。這一方法能夠穩(wěn)定保持器件原有的光學(xué)結(jié)構(gòu),基于聚合物涂敷技術(shù)實(shí)現(xiàn)了環(huán)形諧振腔、Sagnac干涉儀、F-P諧振腔及Mach-Zehnder干涉儀等多種微納光纖器件。經(jīng)測(cè)試,采用聚合物涂敷技術(shù)組裝的器件能夠在20天內(nèi)保持穩(wěn)定的光學(xué)性能。同時(shí),由于采用的涂敷材料具有比石英更低的折射率,能夠保持微納光纖的倏逝場(chǎng)特性,以微納光纖Sagnac干涉儀折射率傳感器為例,其折射率靈敏度達(dá)到2600nm/RIU。最后對(duì)本論文完成的研究工作進(jìn)行總結(jié),并對(duì)未來(lái)的工作做出展望。本文中提出的微納光纖連接與微納光纖器件組裝方法,在實(shí)現(xiàn)微納光纖低損耗連接的同時(shí)又保證了微納光纖結(jié)構(gòu)的穩(wěn)定性與功能穩(wěn)定性。此外還具有操作簡(jiǎn)單,流程簡(jiǎn)潔等優(yōu)點(diǎn),能夠?qū)崿F(xiàn)對(duì)連接和組裝過(guò)程的實(shí)時(shí)監(jiān)測(cè),在自由空間內(nèi)進(jìn)行多角度全方位靈活操作。本文工作將有助于推動(dòng)微納光纖光學(xué)器件向集成化芯片化方向發(fā)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.
【學(xué)位授予單位】：暨南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN253
本文編號(hào)：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.
【學(xué)位授予單位】：暨南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN253
【參考文獻(xiàn)】
相關(guān)期刊論文 前3條
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2 張偉;朱林;李青松;朱新生;俞波;劉兆峰;;羥丙基纖維素的微觀結(jié)構(gòu)和溶解性及再生[J];高分子材料科學(xué)與工程;2013年07期
3 武建芬;陳根祥;;高雙折射光纖Sagnac環(huán)反射特性的JONES矩陣分析[J];激光與光電子學(xué)進(jìn)展;2006年09期
，本文編號(hào)：2457200
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