基于耦合方环共振空腔的可控Fano共振研究
发布时间：2018-09-06 18:31
【摘要】：表面等离子激元学是一门基于表面等离子激元(Surface Plasmon Polaritons,SPPs)的新兴科学。SPPs是一种由金属表面的集群振荡自由电子与外界光子相互耦合激发,能够强烈束缚在介质-金属表面传播的表面电磁波混合模式。SPPs能够克服衍射极限的限制从而使系统更易于集成,结合目前同样发展迅速的纳米技术,基于SPPs设计的表面等离子激元波导特别适合应用于集成光学回路中纳米光子器件的设计与制备。基于MIM(Metal-Insulator-Metal,MIM)型表面等离子激元波导,本文提出一种新型的耦合方环共振空腔波导结构,并针对该波导结构进行部分改进,提出了耦合裂口方环共振空腔波导结构和耦合方环共振空腔与耦合横腔波导结构。利用基于有限元分析法的COMSOL仿真软件针对上述三种波导结构进行了仿真计算,基于仿真计算的结果,对其模场分布、Fano共振及电磁传输特性进行了细致的探究。可知:耦合方环共振空腔波导结构能够产生单重Fano共振,其透射谱可通过改变共振空腔高度H实现调节。敏感度与品质因数最高分别可达1180nm/RIU(单位折射率,Refractive Index Unit,RIU)与41099.1?,作为衡量纳米光学开关性能优劣的重要参数,其消光比最高可达40.85dB,因此该波导结构为纳米光学开关的设计与应用提供了可行性。耦合裂口方环共振空腔波导结构通过裂口位置的不同,分别能够产生Fano共振-洛伦兹共振及双重Fano共振,其透射谱可通过改变共振空腔长度L和裂口大小W实现调节。敏感度与品质因数最高分别可达1700 nm/RIU与51031.1?,已经优于许多已研究过的波导结构。鉴于此,该波导结构在纳米生物传感器设计方面展现出了良好的应用前景。耦合方环共振空腔与耦合横腔波导结构能够产生双重Fano共振(左侧Fano共振与右侧Fano共振),并且透射谱中左侧Fano共振只由方环共振空腔与波导相互作用产生,右侧Fano共振只由耦合横腔与波导相互作用产生。因此该双重Fano共振分别只对方环共振空腔结构参数及耦合横腔结构参数敏感,可通过改变方环共振空腔高度H实现对左侧Fano共振的调节,改变耦合横腔长度L1实现对右侧Fano共振的调节。该特性为波导结构在纳米光束分路器设计方向提供了良好的应用前景。
[Abstract]:Surface plasmon (SPPs) is a new science based on surface plasmon (Surface Plasmon Polaritons,SPPs (SPPs), which is excited by the interaction of oscillating free electrons on metal surface and external photons. The surface electromagnetic wave mixing mode. SPPs, which can be strongly bound to the surface of dielectric and metal, can overcome the limitation of diffraction limit and make the system easier to integrate, combining with the nanotechnology, which is also developing rapidly. The surface plasmon waveguide based on SPPs is especially suitable for the design and fabrication of nanoscale photonic devices in integrated optical circuits. Based on MIM (Metal-Insulator-Metal,MIM) surface plasmon waveguide, a new type of cavity waveguide structure with coupled square ring resonant cavity is proposed in this paper, and the waveguide structure is partially improved. The structure of coupling split square ring resonant cavity waveguide and coupled square ring resonance cavity and coupling transverse cavity waveguide structure are proposed. The COMSOL simulation software based on finite element analysis is used to simulate the above three waveguide structures. Based on the simulation results, the characteristics of mode field distribution and electromagnetic transmission are studied in detail. The results show that the cavity waveguide structure with coupled square ring resonates can produce single Fano resonance and its transmission spectrum can be adjusted by changing the cavity height H. The highest sensitivity and quality factor can reach 1180nm/RIU (Unit Refractive Index Unit,RIU) and 41099.1g, respectively, which are important parameters to evaluate the performance of nano-optical switches. The extinction ratio is up to 40.85 dB, so the waveguide structure provides the feasibility for the design and application of nano-optical switch. The Fano resonance Lorentz resonance and double Fano resonance can be generated by the cavity waveguide structure of coupling split square ring resonance through the different positions of the crack. The transmission spectrum of the waveguide can be adjusted by changing the length of the cavity L and the size of the crack W. The highest sensitivity and quality factor can reach 1700 nm/RIU and 51031.1g, respectively, which are better than many waveguide structures that have been studied. In view of this, the waveguide structure has shown a good application prospect in the design of nanobiosensor. Coupled square ring resonator cavity and coupled transverse cavity waveguide structure can produce double Fano resonance (left Fano resonance and right Fano resonance). In transmission spectrum, the left Fano resonance is generated only by the square ring resonance cavity interacting with the waveguide. The right Fano resonance is generated only by the interaction between the coupled transverse cavity and the waveguide. Therefore, the double Fano resonance is sensitive to the structural parameters of the cavity and the transverse cavity, respectively, and can be adjusted to the left Fano resonance by changing the cavity height H of the square ring resonance. The right Fano resonance can be adjusted by changing the length of the coupling transverse cavity L1. This characteristic provides a good application prospect for waveguide structure in the design direction of nanoscale beam splitter.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN252
本文编号：2227171
[Abstract]:Surface plasmon (SPPs) is a new science based on surface plasmon (Surface Plasmon Polaritons,SPPs (SPPs), which is excited by the interaction of oscillating free electrons on metal surface and external photons. The surface electromagnetic wave mixing mode. SPPs, which can be strongly bound to the surface of dielectric and metal, can overcome the limitation of diffraction limit and make the system easier to integrate, combining with the nanotechnology, which is also developing rapidly. The surface plasmon waveguide based on SPPs is especially suitable for the design and fabrication of nanoscale photonic devices in integrated optical circuits. Based on MIM (Metal-Insulator-Metal,MIM) surface plasmon waveguide, a new type of cavity waveguide structure with coupled square ring resonant cavity is proposed in this paper, and the waveguide structure is partially improved. The structure of coupling split square ring resonant cavity waveguide and coupled square ring resonance cavity and coupling transverse cavity waveguide structure are proposed. The COMSOL simulation software based on finite element analysis is used to simulate the above three waveguide structures. Based on the simulation results, the characteristics of mode field distribution and electromagnetic transmission are studied in detail. The results show that the cavity waveguide structure with coupled square ring resonates can produce single Fano resonance and its transmission spectrum can be adjusted by changing the cavity height H. The highest sensitivity and quality factor can reach 1180nm/RIU (Unit Refractive Index Unit,RIU) and 41099.1g, respectively, which are important parameters to evaluate the performance of nano-optical switches. The extinction ratio is up to 40.85 dB, so the waveguide structure provides the feasibility for the design and application of nano-optical switch. The Fano resonance Lorentz resonance and double Fano resonance can be generated by the cavity waveguide structure of coupling split square ring resonance through the different positions of the crack. The transmission spectrum of the waveguide can be adjusted by changing the length of the cavity L and the size of the crack W. The highest sensitivity and quality factor can reach 1700 nm/RIU and 51031.1g, respectively, which are better than many waveguide structures that have been studied. In view of this, the waveguide structure has shown a good application prospect in the design of nanobiosensor. Coupled square ring resonator cavity and coupled transverse cavity waveguide structure can produce double Fano resonance (left Fano resonance and right Fano resonance). In transmission spectrum, the left Fano resonance is generated only by the square ring resonance cavity interacting with the waveguide. The right Fano resonance is generated only by the interaction between the coupled transverse cavity and the waveguide. Therefore, the double Fano resonance is sensitive to the structural parameters of the cavity and the transverse cavity, respectively, and can be adjusted to the left Fano resonance by changing the cavity height H of the square ring resonance. The right Fano resonance can be adjusted by changing the length of the coupling transverse cavity L1. This characteristic provides a good application prospect for waveguide structure in the design direction of nanoscale beam splitter.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN252
【参考文献】
相关期刊论文 前3条
1 陈慧斌;张志东;闫树斌;焦国太;;基于半圆形与矩形谐振腔耦合结构的Fano共振[J];光子学报;2016年08期
2 安厚霖;张冠茂;胡南;石悦;王志爽;;基于耦合T型空腔的多重法诺共振现象[J];光子学报;2016年11期
3 石振东;赵海发;刘建龙;刘树田;;基于表面等离激元的金属波导全光开关设计[J];光学学报;2015年02期
相关硕士学位论文 前2条
1 孙海丽;对称混合长程表面等离子体激元波导传输特性研究[D];兰州大学;2014年
2 赵宏;介质加载表面等离子体极化波导传输特性研究[D];兰州大学;2012年
，本文编号：2227171
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2227171.html
