摘要
基于非挥发性相变材料Ge_xSb_yTe_z(GST),设计并仿真了两种典型的微波可调超材料器件。结构由刻蚀在玻璃基底上的铜开口谐振环(Split-Ring Resonator,SRR)构成,GST薄膜镀在SRR环开口处。在特定的诱导条件下,相变材料GST将在非晶态和晶态之间产生可逆且相对稳定的转换,并由此获得电磁参数的显著改变,实现超材料器件的可调节。仿真中获得了调制深度为81.09%的可调微波超表面;吸收强度为99.67%的可调吸波器,且通过改变GST薄膜厚度,实现吸收强度由完美吸波到24.50%的连续可调节。本研究为微波可调超材料器件提供了一个新的实现机制。
Two typical microwave tunable metadevices based on non-volatile phase-change material GexSbyTez(GST)were proposed and demonstrated.Both of these two structures were composed of copper split-ring resonators(SRRs)filled with GST medium.It is shown that,when the GST film changes from the amorphous phase to the crystalline one,the electromagnetic properties of the designed metadevices can be actively tuned.Particularly,an active microwave metasurface with a modulation depth of 81.09%and a tunable absorber with an absorption of 99.67%are obtained.Simulations were also carried out to investigate the influence of the thickness and composition of GST film on the performance of these two tunable metadevices.This work provides a new method for microwave tunable metadevices.
作者
王曼婷
高泽华
兰楚文
李勃
WANG Manting;GAO Zehua;LAN Chuwen;LI Bo(Beijing Key Laboratory of Network System Architecture and Convergence,Beijing Laboratory of Advanced Information Networks,School of Information and Communication Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China;Graduate School at Shenzhen,Tsinghua University,Shenzhen 518055,Guangdong Province,China)
出处
《电子元件与材料》
CAS
CSCD
北大核心
2019年第2期64-70,共7页
Electronic Components And Materials
关键词
超材料器件
相变材料
微波
开口谐振环
电磁仿真
metadevice
phase-change material
microwave
split-ring resonator
electromagnetic simulation
