含石墨烯的多层核壳结构自发辐射性质研究  

Spontaneous radiation properties of graphene⁃based core⁃shell structure

作　　者：施沈希 王佐宏 孙梦然 郑改革 SHI Shenxi;WANG Zuohong;SUN Mengran;ZHENG Gaige(School of Physics and Optoelectronic Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China;Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学物理与光电工程学院,江苏南京210044 [2]南京信息工程大学江苏省大气环境与装备技术协同创新中心,江苏南京210044

出　　处：《量子电子学报》2024年第6期970-980,共11页Chinese Journal of Quantum Electronics

基　　金：江苏省自然科学基金面上项目(BK20191396)。

摘　　要：为了研究含石墨烯的核壳结构的光散射特性,特别是电场分布、能量密度以及辐射/非辐射衰减率等,采用传输矩阵法计算了入射光波长和偶极子发射器位置对Au@SiO2@Graphene自发辐射的影响。当内核尺寸和壳层厚度不变时,随着中间介质层Si O2厚度的增加,该核壳结构近场区的Purcell因子增大;核壳结构中Purcell因子随偶极子发射器与球体中心间距的增加而减小,实现了对自发辐射的调控;通过优化石墨烯核壳的结构参数,实现了在可见光范围内, Purcell因子的最大值出现在约633 nm处;在介质层厚度固定时,增加模型的半径会导致Purcell因子的减小;改变模型尺寸参数,可以有效强化含石墨烯的核壳结构与光波之间的相互作用。本研究可为太阳能光热领域提供参考。To study the scattering properties of core-shell structure containing graphene,expecially electric field distribution,energy density,and radiative/nonradiative decay rate properties,the transfer matrix method(TMM)is used to evaluate the effects of wavelength of the incident ray and dipole emitter location on the spontaneous radiation of Au@[e-mail] is found that when the core size and shell thickness remain constant,the Purcell factor in the near-field region of the core-shell structure increases with the increase of the thickness of the intermediate SiO2 dielectric layer.And the Purcell factor of the core-shell structure decreases with the distance of the dipole emitter from the center of the sphere,realizing the regulation of spontaneous radiation.On the other hand,by optimizing the structural parameters of graphene-based core-shell structure,the maximum value of the Purcell factor in the visible light range is achieved at about 633 nm.When the thickness of the dielectric layer is fixed,increasing the radius of the model will lead to a decrease of the Purcell factor.And changing the size parameters of the model can effectively strengthen the interaction between the graphene-based core-shell structure with light wave.The research can provide a reference for the solar thermal field.

关 键 词：光电子学 自发辐射 传输矩阵 核壳结构 石墨烯 

分 类 号：O439[机械工程—光学工程]