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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
Dual-channel dynamically tunable terahertz broadband perfect absorber based on a VO2 and MoS2 composite structure
1School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, China. chenfang@yangtzeu.edu.cn.
None:
We innovatively designed a terahertz broadband absorber based on a VO2 and MoS2 composite structure. Its core technical advantage lies in the construction of a thermal-electro-optical dual-channel collaborative regulation system. The temperature-sensitive phase transition of VO2 and carrier concentration n control in MoS2 together enable precise and flexible modulation in the terahertz band. Under an ambient temperature of 350 K and a MoS2 carrier concentration of n = 1 × 1015 cm-2, the absorber can achieve ultra-broadband perfect absorption in the 2.54-9.86 THz frequency band. When the temperature drops to 300 K and n = 1 × 1015 cm-2, the absorption bandwidth and intensity in the low-frequency band decrease significantly, demonstrating the efficient photothermal regulation performance of VO2. In the high-frequency band, the absorption intensity shows a significant weakening trend with decreasing carrier concentration, confirming the excellent electro-optical modulation capability of MoS2. This region-specific response characteristics enable independent modulation of different frequency domains. The mechanism of the broadband absorption spectrum was obtained by analyzing the optimal impedance matching and electric field distribution under different conductivities. In addition, the absorber maintains stable performance at incident angles <60° and is insensitive to the polarization state of incident light, laying a reliable foundation for its application in complex scenarios.
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