摘要
设计了一种光控可调谐且具有多个吸收频带的太赫兹超材料吸收器,并采用CST 2014仿真软件对该吸收器的结构进行了仿真。为实现吸收器从单频带到四频带的完美吸收,在吸收器衬底上设计了4个不同长度的金属条。为深入研究该吸收器的传输特性,分别对该吸收器在4个吸收峰处的电场分布进行了仿真。为了进一步实现该吸收器的光控可调谐,利用抽运激光照射填充在两对金属条中间的光敏介质。仿真结果表明,该吸收器在4个吸收峰处的吸收率均超过了95%,共振机理为4个不同长度的金属条所对应共振频率的线性叠加。该吸收器实现了从四频带到双频带的调控。
An optically tunable terahertz metamaterial absorber with multiple absorption bands is designed.The CST 2014 simulation software is used to simulate the structure of the designed metamaterial absorber.We designed four metallic bars with varied lengths on the substrate to realize that the perfect absorption of the designed metamaterial absorber which can be controlled from single-band to dual-band.The electric field distributions at four absorption peaks of the metamaterial absorber is simulated to further study the transmission characteristics of the metamaterial absorber.The photosensitive medium in the gap of two metallic bars is further irradiated by apump laser to realize the optically-controlled tuning of the absorber.The simulation results show that the absorptivity of the designed metamaterial absorber at four absorption peaks all exceed 95%.The resonance mechanism of the designed structure is attributed to the overlapping of four resonance frequencies corresponding to the four metallic bars with different lengths.Hence,the perfect absorber can be dynamically controlled from four-band to dual-band.
作者
孟庆龙
张艳
张彬
尚静
Meng Qinglong;Zhang Yan;Zhang Bin;Shang Jing(Food and Pharmaceutical Engineering Institute, Guiyang University, Guiyang, Guizhou 550005, China;School of Electronic and Communication Engineering, Guiyang University, Guiyang, Guizhou 550005, China;College of Electronics and Information Engineering, Sichtean University, Chengdu, Sichuan 610065, China)
出处
《激光与光电子学进展》
CSCD
北大核心
2019年第10期245-250,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61505036)
贵州省科技厅基金项目(黔科合J字[2015]2009号)
博士科研启动经费(GYU-ZRD〔2018〕-012)
关键词
材料
太赫兹
完美吸收器
超材料
多频带
光控
materials
terahertz
perfect absorber
metamaterials
multi-band
optical control
