基于非对称结构全介质超材料的类电磁诱导透明效应研究  

Research on analogue of electromagnetically induced transparency effect based on asymmetric structure all-dielectric metamaterial

作　　者：张跃斌 马成举[1] 张垚 金嘉升 鲍士仟 李咪 李东明[1] Zhang Yue-Bin;Ma Cheng-Ju;Zhang Yao;Jin Jia-Sheng;Bao Shi-Qian;Li Mi Li;Dong-Ming(School of Science,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]西安石油大学理学院,西安710065

出　　处：《物理学报》2021年第19期83-90,共8页Acta Physica Sinica

基　　金：西安石油大学创新与实践能力培养项目(批准号:YCS19211037)资助的课题。

摘　　要：本文设计了一种非对称结构的类电磁诱导透明超材料结构,利用时域有限差分方法对其光学特性和类EIT效应进行了仿真分析,建立了其耦合洛伦兹模型,并对所设计超材料结构的类EIT效应进行了模拟分析.结果表明:利用两个长短不同的硅块明模和明模之间的耦合,在1555 nm附近实现了类电磁诱导透明效应;通过对该超材料的微结构参数进行优化,实现了超高Q值(Q约为8616)的类EIT效应,透射率可达96%;通过调节硅块的长度以破坏超材料结构的非对称性,实现了对类电磁诱导透明窗口的主动调控.所设计的全介质超材料结构具有低损耗、易制备、主动可调控等优点,在主动可调控的慢光器件、高灵敏的光学传感器、窄带滤波器等光学器件的设计中具有潜在的应用价值.The electromagnetically induced transparency(EIT),which is a result of destructive interference between different excitation paths in a three-energy-level atomic medium,makes opaque probe light transparent over a range of frequencies.As this EIT effect is usually accompanied with strong dispersion,it has potential applications such as slow light propagation,optical buffering,nonlinear optics,optical sensing,etc.However,for conventional quantum EIT effect which requires stable gas lasers and low temperature environment,the implement at ion of EIT in chip-scale applications is severely hampered by the scathing experimental requirements.Recently,the EIT-like effect in metamaterials,which are constructed by designing the artificial sub wavelength functional elements and arranging the spatial sequences,attracts tremendous attention because of its advantages,such as room temperature manipulability,large bandwidth,and small sizes.In addition,the high-quality factor(Q) value obtained by EIT-like effect has great significance in designing the metamaterialbased devices.In this paper,we design an EIT-like metamaterial with such a structure.The unit cell of the proposed metamaterial is constructed by two asymmetric silicon blocks embedded on a silicon dioxide substrate.Meanwhile,we analyze its optical properties and EIT-like effects by using three-dimension(3 D) FDTD method.Based on the coupled Lorentz model,the EIT-like effect of the designed metamaterial is investigated.Then,by employing the electric field distribution on the surface of the metamaterial,and combining with the three-level atomic system,the mechanism of the EIT-like effect is analyzed in detail.We find that the EIT-like effect in the proposed metamaterial has high Q value(Q≈8616) and the high transmission(T=96%).By changing the length of the silicon block to destroy the asymmetry of the metamaterial structure,an active tuning EITlike effect is realized.Furthermore,the metamaterial structure has the advantages of low loss,easy preparation,and active-control

关 键 词：全介质超材料 电磁诱导透明 耦合洛伦兹模型 

分 类 号：TB34[一般工业技术—材料科学与工程]