太赫兹辐射
材料科学
石墨烯
超材料吸收剂
超材料
光电子学
吸收(声学)
表面等离子体激元
光学
吸收带
宽带
等离子体子
表面等离子体子
物理
纳米技术
可调谐超材料
复合材料
作者
Zhe Chen,Jinjiang Chen,Haowen Tang,Tao Shen,Hui Zhang
出处
期刊:Optics Express
[The Optical Society]
日期:2022-02-15
卷期号:30 (5): 6778-6778
被引量:12
摘要
This paper proposes a terahertz absorber with a simple four-layered structure that can be dynamically switched between broadband and triple-band by controlling the chemical potential of graphene. The proposed absorber owns broadband absorption in the frequency range from 5.28 THz to 7.86 THz with the corresponding absorption efficiency above 90%, when the chemical potential of graphene is 150 meV. By increasing the chemical potential of graphene to 550 meV, the broadband absorption splits into triple-band absorption, with the peak locating at 5.39 THz, 7.01 THz and 8.1 THz, respectively. Detailed investigation shows that the broadband absorption should originate from magnetic resonance, Fabry-Pérot cavity resonance and surface plasmon polariton. The triple-band absorption should arise from the combination of Fabry-Pérot cavity resonance and surface plasmon polariton. Additionally, both broadband absorption and triple-band absorption are insensitive to the incident polarization. This tunable and bifunctional metamaterial structure shows a great potential in terahertz applications, such as detectors, modulators and sensors.
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