表面等离子体光纤波导的模式特性及色散调制的研究
发布时间：2019-03-25 17:08
【摘要】：近年来,微纳波导中光学特性的研究吸引了越来越多的研究者的注意。而表面等离子体(SPP)在波导中的突出性能:可以突破光的衍射极限将其限制在微纳尺度范围,并能实现对光场的增强限制,以此可提高非线性相互作用。另外,据调研,目前的SPP波导局限在平板波导。基于此,研究设计线性波导并其在通信波段的光学特性是很有必要的。本文的主要内容就是基于表面等离子体的光纤波导中模式特性及其色散调制的研究。在基础理论部分,首先简要回顾了光在波导中传输时存在的几种色散形式:材料色散、波导色散、模式色散。接着介绍了非线性效应中四波混频的基本原理。在现有理论基础上,通过对非简并四波混频效应耦合模差分方程的推到,分析出了实现高效的波长转换的几个关键因素。首先要通过合理的设计波导结构实现进行波长转换的对应模式间的相位匹配;另一方面要利用具有高的非线性极化张量的介质作为非线性相互作用的媒介;最后,要获得高的非线性系数,还要通过设计波导结构,获得小的模场面积积分值。根据以上分析,对本文提出的金属-介质-金属波导结构做了相应调整,分别在微米和纳米尺度进行了模拟分析。据相关文献调研,表面等离子激子可有效的提高波导结构对光场的限制能力,使非线性效应得到增强。文中主要提出并研究了两种金属包层的光纤波导结构:一种为金属包层的微光纤;另一种为金属-介质-金属光纤波导。对于第一种波导模型,文中详细分析了不同金属包层厚度对波导中光场分布,有效模式指数及传输损耗等相关特性的影响。在此基础上,通过对波导中模式色散特性的调制分析,利用模间相位匹配技术,在微光纤半径1μm附近实现基频光与其三次谐波光对应模式的相位匹配,且相位匹配点附近,两模式的有效折射指数曲线非常靠近,有利于实际应用中非线性效应的实现。对于金属-介质-金属这一波导结构,分别在微米、纳米尺度范围内对其中存在的光波模式、传输特性、色散特性及光场的限制能力做了研究。微米尺度上,通过改变不同的结构参数实现了对零色散点的调制。纳米尺度上,波导实现了对光场突破衍射极限的强的场强限制。利用不同波长的光在同一模式上的相位匹配技术,分析了其在四波混频效应中的表现性能。
[Abstract]:In recent years, more and more researchers have paid attention to the study of optical properties in micro / nano waveguides. The outstanding performance of surface plasma (SPP) in waveguide: it can break through the diffraction limit of light to limit it to the range of micro-and nano-scale, and can realize the enhancement limitation of light field, so that the nonlinear interaction can be improved. In addition, according to the investigation, the current SPP waveguide is limited to the flat waveguide. Therefore, it is necessary to study and design linear waveguides and their optical properties in the communication band. The main content of this paper is the study of mode characteristics and dispersion modulation in fiber waveguides based on surface plasma. In the basic theory part, several dispersion forms of light propagation in waveguide are briefly reviewed: material dispersion, waveguide dispersion and mode dispersion. Then the basic principle of four-wave mixing in nonlinear effect is introduced. On the basis of the existing theory, several key factors to realize efficient wavelength conversion are analyzed by deducting the coupled mode difference equation with non-degenerate four-wave mixing effect. Firstly, the phase matching between the corresponding modes of wavelength conversion should be realized through the rational design of waveguide structure, on the other hand, the medium with high nonlinear polarization Zhang Liang should be used as the medium of nonlinear interaction. Finally, in order to obtain the high nonlinear coefficient, we must design the waveguide structure and obtain the small mode field area integral value. According to the above analysis, the structure of the metal-dielectric-metal waveguide proposed in this paper is adjusted accordingly, and the simulation analysis is carried out on the micro-scale and the nano-scale respectively. According to the relevant literature investigation, the surface plasma exciton can effectively improve the limiting ability of the waveguide structure to the light field and enhance the nonlinear effect. In this paper, two kinds of metal-clad optical fiber waveguides are proposed and studied: one is metal-clad micro-fiber, and the other is metal-dielectric-metal fiber waveguide. For the first waveguide model, the effects of different metal cladding thickness on the optical field distribution, effective mode index and transmission loss in the waveguide are analyzed in detail. On this basis, through the modulation analysis of the mode dispersion characteristics in the waveguide, the phase matching between the fundamental frequency light and its third harmonic light near the radius of 1 渭 m is realized by using the inter-mode phase matching technique, and the phase matching point is near the phase matching point. The effective refractive index curves of the two modes are very close to each other, which is beneficial to the realization of nonlinear effect in practical applications. For the metal-dielectric-metal waveguide structure, the optical wave modes, propagation characteristics, dispersion characteristics and the limiting ability of the light field are studied in the micron and nano-scale respectively. On the micron scale, the zero dispersion point modulation is realized by changing different structural parameters. On the nanometer scale, the waveguide realizes the strong field strength restriction to the light field breaking the diffraction limit. By using the phase matching technique of different wavelengths of light in the same mode, its performance in the four-wave mixing effect is analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN25
本文编号：2447160
[Abstract]:In recent years, more and more researchers have paid attention to the study of optical properties in micro / nano waveguides. The outstanding performance of surface plasma (SPP) in waveguide: it can break through the diffraction limit of light to limit it to the range of micro-and nano-scale, and can realize the enhancement limitation of light field, so that the nonlinear interaction can be improved. In addition, according to the investigation, the current SPP waveguide is limited to the flat waveguide. Therefore, it is necessary to study and design linear waveguides and their optical properties in the communication band. The main content of this paper is the study of mode characteristics and dispersion modulation in fiber waveguides based on surface plasma. In the basic theory part, several dispersion forms of light propagation in waveguide are briefly reviewed: material dispersion, waveguide dispersion and mode dispersion. Then the basic principle of four-wave mixing in nonlinear effect is introduced. On the basis of the existing theory, several key factors to realize efficient wavelength conversion are analyzed by deducting the coupled mode difference equation with non-degenerate four-wave mixing effect. Firstly, the phase matching between the corresponding modes of wavelength conversion should be realized through the rational design of waveguide structure, on the other hand, the medium with high nonlinear polarization Zhang Liang should be used as the medium of nonlinear interaction. Finally, in order to obtain the high nonlinear coefficient, we must design the waveguide structure and obtain the small mode field area integral value. According to the above analysis, the structure of the metal-dielectric-metal waveguide proposed in this paper is adjusted accordingly, and the simulation analysis is carried out on the micro-scale and the nano-scale respectively. According to the relevant literature investigation, the surface plasma exciton can effectively improve the limiting ability of the waveguide structure to the light field and enhance the nonlinear effect. In this paper, two kinds of metal-clad optical fiber waveguides are proposed and studied: one is metal-clad micro-fiber, and the other is metal-dielectric-metal fiber waveguide. For the first waveguide model, the effects of different metal cladding thickness on the optical field distribution, effective mode index and transmission loss in the waveguide are analyzed in detail. On this basis, through the modulation analysis of the mode dispersion characteristics in the waveguide, the phase matching between the fundamental frequency light and its third harmonic light near the radius of 1 渭 m is realized by using the inter-mode phase matching technique, and the phase matching point is near the phase matching point. The effective refractive index curves of the two modes are very close to each other, which is beneficial to the realization of nonlinear effect in practical applications. For the metal-dielectric-metal waveguide structure, the optical wave modes, propagation characteristics, dispersion characteristics and the limiting ability of the light field are studied in the micron and nano-scale respectively. On the micron scale, the zero dispersion point modulation is realized by changing different structural parameters. On the nanometer scale, the waveguide realizes the strong field strength restriction to the light field breaking the diffraction limit. By using the phase matching technique of different wavelengths of light in the same mode, its performance in the four-wave mixing effect is analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN25
【参考文献】
相关期刊论文 前1条
1 曾志男,李儒新,谢新华,徐至展;采用双脉冲驱动产生高次谐波阿秒脉冲[J];物理学报;2004年07期
，本文编号：2447160
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