材料科学
极化(电化学)
光学
光子晶体
光电子学
单层
超材料
太赫兹辐射
各向异性
布鲁斯特角
雷
分子物理学
等离子体子
物理
纳米技术
化学
物理化学
布鲁斯特
作者
Ye Ming Qing,Hui Feng,Tie Jun Cui
出处
期刊:Optics Express
[The Optical Society]
日期:2018-11-26
卷期号:26 (25): 32442-32442
被引量:87
摘要
A metamaterial perfect absorber composed of a black phosphorus (BP) monolayer, a photonic crystal, and a metallic mirror is designed and investigated to enhance light absorption at terahertz frequencies. Numerical results reveal that the absorption is enhanced greatly with narrow spectra due to critical coupling, which is enabled by guided resonances. Intriguingly, the structure manifests the unusual polarization-dependent feature attributable to the anisotropy of black phosphorus. The quality factor of the absorber can be as high as 95.1 for one polarization while 63.5 for another polarization, which is consistent with the coupled wave theory. The absorption is tunable by varying key parameters, such as period, radius, slab thickness, incident angle, and polarization angle. Furthermore, the state of the system (i.e., critical coupling, over coupling, and under coupling) can be tuned by changing the electron doping of BP, thus achieving various applications. This work offers a paradigm to enhance the light-matter interaction in monolayer BP without plasmonic response, and this easy-to-fabricate structure will provide potential applications in BP-based devices.
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