摘要
本文基于阻抗匹配原理和表面等离子体共振理论,设计了一种石墨烯-MIM结构-金属铝(Al)底板三层结构超材料吸收器。采用时域有限差分法FDTD研究和分析了吸收器的共振吸收光谱,电磁场能量分布,并优化了设计结构。研究结果表明,该吸收器具有近红外波段四个超窄带吸收峰;最大吸收率可达0.943,3 dB带宽均为3.55μm左右。吸收器顶层覆盖石墨烯增强光吸收并激发表面等离子体波;随着石墨烯层厚度的增加,四通道吸收光谱整体右移,但吸收率几乎不变;四个吸收峰峰位波长对MIM结构高度不敏感,伴随吸收率变化明显,当MIM结构高度为110 nm时,相邻三通道吸收率均达到最大值。这种多通道、超窄带吸收器可为高精度传感、功能成像和三维存储等领域的应用提供有用参考。
A three-layer metamaterials absorber,with graphene-MIM-Al,is designed Based on the impedance matching principle and surface plasmon resonance(SPR)theory,The finite-difference time-domain method was used to study and analysis the absorber′s absorption spectra,electromagnetic field energy distribution and the design structure of the absorber.The results show that the absorber has four ultra-narrow band absorption peaks in near-infrared band,the maximum absorption rate is 0.943,and the 3 dB bandwidth is about 3.55μm.With the increase of the thickness of the graphene layer,the four-channel absorption spectrum shifts to the right and the absorption rate remains almost unchanged The four absorption peaks are insensitive to the height of MIM Structure,but the change of absorption rate is obvious.When the height of MIM Structure is 110 nm,the absorption rate of adjacent three channels reaches the maximum.The multi-channel and ultra-narrow-band absorber provides a reference for high-precision sensing,functional imaging and three-dimensional storage applications.
作者
闵雨龙
赵洪霞
郑邹
韩兆佳
张天宇
MIN Yu-long;ZHAO Hong-xia;ZHENG Zou;HAN Zhao-jia;ZHANG Tian-yu(Electronic and Information Engineering College,Ningbo University of Technology»ningbo,Zhejiang 315016,China)
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2021年第5期451-456,共6页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(61605097)
浙江省基础公益研究计划项目(LGC20F050001,LGC19F050001)资助项目。
关键词
吸收器
表面等离子体共振
近红外
四通道
absorber
surface plasmon resonance
near infrared
four channels
