Independently tunable dual-band plasmonically induced transparency based on hybrid metal-graphene metamaterials at mid-infrared frequencies
Independently tunable dual-band plasmonically induced transparency based on hybrid metal-graphene metamaterials at mid-infrared frequencies
复制标题
基于混合金属-石墨烯超材料的中红外频率独立可调双波段等离子体诱导透明度
DOI：
10.1364/oe.25.001242
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发表时间：
2017-01-23
期刊：
影响因子：
3.8
通讯作者：
Deng, Xiaoxu
中科院分区：
文献类型：
--
作者：
Sun, Chen;Dong, Zhewei;Deng, Xiaoxu
提出了一种基于混合金属-石墨烯纳米结构的中红外频率可调谐双波段等离激元诱导透明（PIT）器件，该器件由分别放置在单独的石墨烯叉指组上的两种不同尺寸的金支石结构组成。耦合洛伦兹振子模型用于解释多频域下PIT效应的物理机制。采用时域有限差分 (FDTD) 解来模拟混合金属-石墨烯双频带 PIT 器件的特性。通过改变相应石墨烯指组的费米能量来分别动态调制多个透明峰的模拟光谱位置，这与理论分析非常吻合。与传统的金属PIT器件不同，混合金属-石墨烯PIT器件中的多个PIT谐振是通过施加在相应石墨烯指上的静电改变偏置电压独立调制的，可广泛应用于光学信息处理中，如可调谐传感器、开关和滤波器。 (C) 2017年美国光学学会
A tunable dual-band plasmonically induced transparency (PIT) device based on hybrid metal-graphene nanostructures is proposed theoretically and numerically at mid-infrared frequencies, which is composed of two kinds of gold dolmen-like structures with different sizes placed on separate graphene interdigitated finger sets respectively. The coupled Lorentz oscillator model is used to explain the physical mechanism of the PIT effect at multiple frequency domains. The finite-difference time-domain (FDTD) solutions are employed to simulate the characteristics of the hybrid metal-graphene dual-band PIT device. The simulated spectral locations of multiple transparency peaks are separately and dynamically modulated by varying the Fermi energy of corresponding graphene finger set, which is in good accordance with the theoretical analysis. Distinguished from the conventional metallic PIT devices, multiple PIT resonances in the hybrid metal-graphene PIT device are independently modulated by electrostatically changing bias voltages applied on corresponding graphene fingers, which can be widely applied in optical information processing as tunable sensors, switches, and filters. (C) 2017 Optical Society of America