基于稀土离子电磁偶极跃迁的光频超常介质  

Optical Abnormal Electromagnetic Media Based on Electronic Transition in Rare-Earth Ions

作　　者：周济[1] 傅晓建 Zhou Ji;Fu Xiaojian(School of Materials Science&Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学材料学院,北京100084

出　　处：《中国稀土学报》2020年第3期433-439,I0004,共8页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金委员会基础科学中心项目(51788104)及重点项目(51532004)资助。

摘　　要：超常电磁介质具有自然材料所不具有的奇异电磁参数,成为颠覆性技术的生长点。目前这类材料主要基于周期性的谐振结构(超材料)技术,而可见光频段超常介质的实现则面临着技术制约和物理极限。为此提出了利用稀土离子的电子共振跃迁机制实现光频的超常电磁响应。根据半经典理论分析了稀土掺杂晶体中的二能级电子跃迁过程,获得了电磁参数与跃迁参数的关系,在此基础上可模拟出跃迁频率处的超常电磁响应,进而通过选择特定共掺稀土离子获得负折射材料。本文综述了该领域的一些研究进展。Abnormal electromagnetic(EM) media possesses novel EM properties not existed in nature, and is becoming a growing point of subversive technologies. These materials are mainly based on the periodic resonant structure, namely metamaterials, facing technical constraints and physical limitations in visible optics range. For this reason, we proposed to use the electronic transition mechanism of rare earth ions to realize abnormal electromagnetic response in optical frequency. According to the semi-classical theory, the two level transitions of electrons in rare-earth doped crystals were analyzed, and the expressions of EM parameters related to transition parameters were obtained. It is shown that abnormal electric or magnetic resonance can be observed near the transition frequency, and negative refraction can be designed by selecting two ions with the simultaneous electric and magnetic resonances. In this paper, some research advances in this field are reviewed.

关 键 词：超常电磁介质 稀土离子 偶极共振跃迁 

分 类 号：O441.6[理学—电磁学]