基于电磁近场扫描系统测量光子晶体的能带  

Measuring energy band of photonic crystal based on electromagnetic wave near-field scanning systems

作　　者：袁媛 莫浩昌 董建文 赵福利 陈晓东 YUAN Yuan;MO Haochang;DONG Jianwen;ZHAO Fuli;CHEN Xiaodong(School of Physics,Sun Yat-sen University,Guangzhou 510275,China)

机构地区：[1]中山大学物理学院,广东广州510275

出　　处：《物理实验》2025年第2期51-56,共6页Physics Experimentation

基　　金：粤疆藏区域联合光学虚拟教研共同体建设项目(No.GDSGGT2022003);2022年度广东省高校教学质量与教学改革工程项目-光学虚拟教研室(粤教高函[2023]4号)。

摘　　要：在固体物理的教学中,晶体结构和能带理论是重要的基础知识.然而,现有的本科教学中缺乏相应的实验以直观演示这些概念和理论.针对这一现状,基于电磁近场扫描系统开展光子晶体能带测量实验.通过对电磁场进行近场扫描成像,表征光锥的线性色散能带,并测量光子晶体的能带及其禁带.通过构建线缺陷,设计并演示了可引导光传输的光子晶体波导,实验测量结果与仿真模拟结果一致.实验以光子晶体为研究对象,直观地展示了晶体的能带及其光场调控特性,有助于增强学生对固体物理中晶体结构和能带理论的掌握和理解.In solid-state physics teaching,the understanding of crystal structures and band theory is crucial.However,the corresponding experiments are lack in undergraduate teaching to visually demonstrate these concepts and theories.To address this issue,an experiment focused on the measurement of photonic crystal band dispersions was introduced using the near-field electromagnetic wave scanning system.Through the near-field scanning imaging of the electromagnetic field,the linear band dispersions of light cones could be characterized,and as well the bands and forbidden bands of photonic crystals were measured.By constructing a line defect,the photonic crystal waveguide capable of guiding light transmission was designed and demonstrated.The exprimental result was cosistent with the simulation.Having photonic crystals as the object,this experiment visually illustrated the charateristics of band structure of crystal and their light field modulation,thereby enhancing students’understanding of crystal structures and band theory in solid-state physics.

关 键 词：能带 光子晶体 电磁近场扫描 傅里叶变换 

分 类 号：O481.1[理学—固体物理]