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Updated: Apr 28, 2026
Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
VO2-Graphene Terahertz Multifunctional Metasurface with Switchable Broadband Waveplates and Absorber
Hong Su1, Tao Huang1, Gaozhao Liu1
1State Key Laboratory of Radio Frequency Heterogeneous Integration, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
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A terahertz multifunctional metasurface based on vanadium dioxide (VO2) and graphene that can switch between waveplate and absorber functionalities is proposed. As the temperature is below 300 K, by electrically controlling the Femi energy of the graphene it can realize half-wave plate (HWP) and quarter-wave plate (QWP) functionalities in the operating bandwidths of both 1.39-2.34 THz and 0.92-2.68 THz, respectively. While the temperature is above 340 K, the dipole resonance between VO2 and a gold reflector induces absorption. Furthermore, by applying the voltage to graphene, dual-parameter modulation of the amplitude of the transverse electric (TE) waves and the resonance frequency of the transverse magnetic (TM) waves is achieved, the absorption bandwidths of which are 3.65-3.78 THz and 1.41-3.12 THz, respectively. The operating frequencies for HWP, QWP, TE and TM waves can be tuned by changing the electrical field and working temperature. In addition, the incident angles are not sensitive to the performance of the metasurface, confirming its effectiveness even under large-angle incidence. The metasurface with simplicity in design, mature fabrication processes, and comprehensive functionality, has certain promising applications in terahertz optical switches, terahertz spectroscopy systems, modulators, and communication systems.
