Abstract
We present a dynamically tunable anomalous electromagnetic induced transparency (EIT) of a cavity-integrated metallic grating by the coupling of guided-mode resonance (GMR) with cavity-mode resonance (CMR) in the terahertz regime. The strong group slowing effect of terahertz waves results from the EIT mechanism under simultaneous excitation of GMR and CMR at a degenerate state. With the introduction of graphene as a functional layer overlying the grating structure, the enhanced group delay can be achievable beyond 6.1 ps with stable operation frequency and signal efficiency by tuning the graphene Fermi level. The work could provide an efficient scheme to manipulate the group velocity of terahertz signals.
© 2021 Optical Society of America
Full Article | PDF ArticleMore Like This
Tianzhi Wang, Fei Yan, Ruoxing Wang, Fengjun Tian, and Li Li
Appl. Opt. 59(24) 7179-7185 (2020)
Shuyuan Xiao, Tingting Liu, Chaobiao Zhou, Xiaoyun Jiang, Le Cheng, and Chen Xu
J. Opt. Soc. Am. B 36(7) E48-E54 (2019)
Baoku Wang, Tong Guo, Ke Gai, Fei Yan, Ruoxing Wang, and Li Li
Appl. Opt. 61(11) 3218-3222 (2022)