posted on 2020-03-13, 13:05authored byXiaoyu Liu, Zizheng Liu, Ming Hua, Luyao Wang, Kaifeng Wang, Weiwei Zhang, Yafei Ning, Yanpeng Shi, Xiaodong Wang, Fuhua Yang
Anapole
mode is excited by the destructive interference between
the toroidal- and electric-dipole moments, resulting in a high-quality
(Q) factor. In this paper, we designed a high-Q-factor metamaterial that shows anapole behaviors in the
terahertz region. Through the introduction of graphene, the destructive
interference condition is disturbed and tunability can be realized.
This pattern reflects a brilliant tunability performance in which
frequency movements above 250 GHz per 0.1 eV can be verified. Ingenious
adjustment by the position of graphene offers the possibility of diversified
tuning capabilities. Such a tunable terahertz metamaterial has great
potential in reconfigurable sensors.