时域有限差分法
石墨烯
材料科学
共振(粒子物理)
光学
灵敏度(控制系统)
波长
光电子学
联轴节(管道)
阻抗匹配
超材料
单层
吸收(声学)
电阻抗
物理
电子工程
纳米技术
原子物理学
量子力学
工程类
冶金
作者
Liying Jiang,Chao Yuan,Zhiyou Li,Sheng Ju,Zao Yi,Weitang Yao,Pinghui Wu,Zhimin Liu,Shubo Cheng,Mingyang Pan
标识
DOI:10.1016/j.diamond.2020.108227
摘要
The Finite Difference Time Domain (FDTD) method is used for the simulation, and a new method based on critical coupling and guided resonance is proposed theoretically and numerically to realize a multi-band ideal absorber (PA) of monolayer graphene. Its physical mechanism can be more perfectly analyzed through impedance matching and coupled mode theory (CMT). Due to the guided resonance (100% transmission or reflection efficiency is obtained through the coupling of the leakage mode and the guided mode under the phase matching condition), the perfect absorber can obtain four perfect absorption peaks. The resonance wavelengths are located at λ1 = 1085.03 nm, λ2 = 1131.48 nm, λ3 = 1187 nm and λ4 = 1365.35 nm, respectively. Their absorption rates are 95.88%, 99.81%, 97.44% and 95.30%. At the same time, we can also see a phenomenon in which the spectral position and value of the absorption peak can be adjusted by changing the relevant geometric parameters in the system (the geometric size, period, and incident angle of the hexagonal air hole absorber). Meanwhile, the structure we designed has certain advantages in the field of similar absorber research by briefly calculating related values of sensing performance. The sensitivity of its four resonance peaks are 46.45, 94.35, 151 and 598.9 nm/RIU, and FOM are 5.445, 11.192, 19.895 and 85.680. So we believe that the research has huge application prospects in terms of sensors, tunable spectrum detection, environmental monitoring and medical diagnosis, modulators and optoelectronic device sensors.
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