Lao Chaode, Liang Yaoyao, Wang Xianjun, Fan Haihua, Wang Faqiang, Meng Hongyun, Guo Jianping, Liu Hongzhan, Wei Zhongchao
Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China.
Nanomaterials (Basel). 2019 Jan 30;9(2):171. doi: 10.3390/nano9020171.
In this paper, a novel method to realize a dynamically tunable analogue of EIT for the resonance strength rather than the resonance frequency is proposed in the terahertz spectrum. The introduced method is composed of a metal EIT-like structure, in which a distinct EIT phenomenon resulting from the near field coupling between bright and dark mode resonators can be obtained, as well as an integrated monolayer graphene ribbon under the dark mode resonator that can continuously adjust the resonance strength of transparency peak by changing the Fermi level of the graphene. Comparing structures that need to be modulated individually for each unit cell of the metamaterials, the proposed modulation mechanism was convenient for achieving synchronous operations for all unit cells. This work demonstrates a new platform of modulating the EIT analogue and paves the way to design terahertz functional devices which meet the needs of optical networks and terahertz communications.
本文提出了一种在太赫兹光谱中实现用于共振强度而非共振频率的动态可调谐电磁诱导透明（EIT）类似物的新方法。所介绍的方法由一个类金属EIT结构组成，在该结构中，可获得由亮模式和暗模式谐振器之间的近场耦合产生的独特EIT现象，以及位于暗模式谐振器下方的集成单层石墨烯带，其可通过改变石墨烯的费米能级来连续调节透明峰的共振强度。与需要对超材料的每个单元胞进行单独调制的结构相比，所提出的调制机制便于对所有单元胞实现同步操作。这项工作展示了一种调制EIT类似物的新平台，并为设计满足光网络和太赫兹通信需求的太赫兹功能器件铺平了道路。
