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Terahertz devices is promising in the development of next-generation infrared photodetectors. However, the performances of photodetectors are largely limited by their poor light absorption and small detection range. Here, we designed a vanadium dioxide (VO 2 ) based tunable broadband terahertz (THz) metasurface absorber (VO 2 -BTMA) for a wider tunable broadband detection range. The results show that the VO 2 - BTMA is able to maintain more than 90% absorption in the range of 2.21–5.64 THz with an ultra-wide bandwidth of 3.43 THz. When the absorption peaks are at 2.607 THz and 5.064 THz, the absorption rates of VO 2 - BTMA devices reaches 96.8% and 96.4% respectively. Meanwhile, we found that the conductivity of VO 2  can be controlled by changing the temperature, thus affecting the absorption rate of the device and achieving tunability. When the incident angle of terahertz wave increases from 0° to 50°, the absorber can still maintain 80% of the absorption rate, and the absorber has excellent stability.

Theoretical design and investigation of VO 2 -based tunable broadband terahertz metasurface absorber