posted on 2023-11-21, 12:35authored byYumin Gong, Baogang Quan, Fangrong Hu, Longhui Zhang, Mingzhu Jiang, Shangjun Lin
Terahertz
(THz) field enhancement has significant applications
in high-resolution imaging, next-generation wireless communications,
and networking. In this work, we experimentally demonstrate a graphene
metasurface for THz field enhancement that is based on the intervalley
scattering theory. Each meta-atom of the metasurface is composed of
one split-ring resonator (SRR) embedded in one graphene patch. The
experimental results show that, by electrically adjusting the conductivity
of the graphene patch, the THz field through the entire sample is
enhanced by 23 times and the transmission amplitude at 0.47 THz decreases
8.4 dB. Moreover, the maximum phase difference at 0.43 THz reaches
88°. The experiment shows good agreement with simulation. This
study paves a way for exploring THz–matter interactions and
nonlinear optics.