Active control of broadband plasmon-induced transparency in a terahertz hybrid metal–graphene metamaterial |
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| Authors: | Zhaojian Zhang Junbo Yang Xin He Yunxin Han Jingjing Zhang Jie Huang Dingbo Chen Siyu Xu |
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| Affiliation: | College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073 China.; Center of Material Science, National University of Defense Technology, Changsha 410073 China, |
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| Abstract: | A hybrid metal–graphene metamaterial (MM) is reported to achieve active control of broadband plasmon-induced transparency (PIT) in the THz region. The unit cell consists of one cut wire (CW), four U-shaped resonators (USRs) and monolayer graphene sheets under the USRs. Via near-field coupling, broadband PIT can be produced through the interference between different modes. Based on different arrangements of graphene positions, not only can we achieve electrical switching of the amplitude of broadband PIT, but can also realize modulation of the bandwidth of the transparent window. Simultaneously, both the capability and region of slow light can be dynamically tunable. This work provides schemes to manipulate PIT with more degrees of freedom, which will find significant applications in multifunctional THz modulation.A hybrid metal–graphene metamaterial (MM) is reported to achieve active control of broadband plasmon-induced transparency (PIT) in the THz region. |
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