期刊
NANOMATERIALS
卷 11, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/nano11112876
关键词
plasmon-induced transparency; terahertz; graphene; strontium titanate; slow light
类别
资金
- Natural Science Foundation of Heilongjiang Province [LH2021A019]
- East University of Heilongjiang Scientific Research Fund [HDFHX210110, 210111, HDFKYTD202105]
A bifunctional tunable metamaterial composed of pattern metal structure, graphene, and strontium titanate (STO) film is proposed and studied numerically and theoretically. The physical mechanism of the dual plasmon-induced transparency (PIT) was theoretically analyzed through a three-harmonic oscillator model, showing that the regulation function of the PIT peak results from the change of the oscillation damping at the dark state DSSRs by tuning the conductivity of graphene. This design provides a new structure to realize bifunctional optical switch and slow light effects through independent tuning of graphene properties and metamaterial temperature.
A bifunctional tunable metamaterial composed of pattern metal structure, graphene, and strontium titanate (STO) film is proposed and studied numerically and theoretically. The dual plasmon-induced transparency (PIT) window is obtained by coupling the bright state cut wire (CW) and two pairs of dark state dual symmetric semiring resonators (DSSRs) with different parameters. Correspondingly, slow light effect can also be realized. When shifting independently, the Fermi level of the graphene strips, the amplitudes of the two PIT transparency windows and slow light effect can be tuned, respectively. In addition, when independently tuning the temperature of the metamaterial, the frequency of the dual PIT windows and slow light effect can be tuned. The physical mechanism of the dual-PIT was analyzed theoretically by using a three-harmonic oscillator model. The results show that the regulation function of the PIT peak results from the change of the oscillation damping at the dark state DSSRs by tuning conductivity of graphene. Our design presents a new structure to realize the bifunctional optical switch and slow light.
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