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Highly tunable multi‐band THz absorber with circuit model representation using multi‐bias scheme
Author(s) -
Aghaee Toktam,
Orouji Ali A.
Publication year - 2020
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.2777
Subject(s) - terahertz radiation , absorption (acoustics) , impedance matching , metamaterial , equivalent circuit , biasing , representation (politics) , materials science , optoelectronics , electrical element , electrical impedance , scheme (mathematics) , optics , computer science , electronic engineering , physics , mathematics , mathematical analysis , voltage , politics , political science , law , engineering , quantum mechanics
Utilizing a double bias scheme for graphene patterns as a single layer, a THz meta‐surface structure is proposed. The structure includes two dual bias layers and a graphene continuous sheet on top. So five possible biases are available which lead to a highly tunable absorption response. All consisting parts are modeled via passive circuit elements to obtain whole device input impedance. Then impedance matching theory is used to investigate potential frequencies for perfect absorption. Also, ample simulations are performed to show the validity and accuracy of theoretical descriptions. According to the simulation results in the conventional finite element method as a reference approach is in acceptable agreement with the developed circuit model approach. The proposed structure shows nearly perfect absorption in 5, 6, 7, and 8 THz with absorption rate over 90%. Such a tunable reaction is in incredible requests in optical systems and has various applications in structuring sensors, modulators, and photonic functions.