材料科学
衰减
光学
太赫兹辐射
光电子学
石墨烯
宽带
带通滤波器
通带
物理
纳米技术
作者
Wenli Huang,Xingqi Luo,Yuanfu Lu,Fangrong Hu,Guangyuan Li
出处
期刊:Applied Optics
[Optica Publishing Group]
日期:2021-07-22
卷期号:60 (22): 6366-6366
被引量:6
摘要
We propose an ultra-broadband terahertz bandpass filter with dynamically tunable attenuation based on a graphene–metal hybrid metasurface. The metasurface unit cell is composed of two metal stripes enclosed with a graphene rectangular ring. Results show that when the metasurface is normally illuminated by a terahertz wave polarized along the metal stripes, it can act as an ultra-broadband bandpass filter over the spectral range from 1.49 THz to 4.05 THz, corresponding to a fractional bandwidth of 92%. Remarkably, high transmittance above 90% covering the range from 1.98 THz to 3.95 THz can be achieved. By changing the Fermi level of graphene, we find that the attenuation within the passband can be dynamically tuned from 2% to 66%. We expect that the proposed ultra-broadband terahertz bandpass filter with tunable attenuation will find applications in terahertz communication and detection and sensing systems.
科研通智能强力驱动
Strongly Powered by AbleSci AI