Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 51, Issue 41, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aadb7f
Keywords
terahertz; metamaterial; graphene; electromagnetically induced transparency
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Funding
- National Natural Science Foundation of China [61775064]
- Fundamental Research Funds for the Central Universities [HUST: 2016YXMS024]
- Natural Science Foundation of Hubei Province [2015CFB398, 2015CFB502]
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We theoretically investigate the interaction between the conductive graphene layer with the dual-spectral electromagnetically induced transparency (EIT) metamaterial and achieve independent amplitude modulation of the transmission peaks in the terahertz (THz) regime. The dual-spectral FIT resonance results from the strong near field coupling effects between the bright Cm wire resonator in the middle and two dark double-split ring resonators on the two sides. By integrating monolayer graphene under the dark mode resonators, the two transmission peaks of the EIT resonance can exhibit independent amplitude modulation via the shifting of the Fermi level of the corresponding graphene layer. The physical mechanism of the modulation can be attributed to the variation of damping factors of the dark mode resonators arising from the tunable conductivity of graphene. This work shows great prospects in designing multiple-spectral THz functional devices with highly flexible tunability and implies promising applications in multi-channel selective switching, modulation and slow light.
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