In this letter, by using vanadium dioxide (VO₂) with metal–insulator transition (MIT) temperatures of 60 ℃ and 72 ℃, respectively, and analyzing the effects of the two states of VO₂ before (insulator state) and after (metal state) MIT on the amplitude and phase of the double MIT VO₂ (DMITV) unit structure, constituting the terahertz beam reconfigurable phase gradient metasurface of VO₂ based on different MIT temperatures, which achieves flexible regulation of terahertz beam. The structure is composed of two different MIT temperature VO₂, polytetrafluoroethylene (PTFE) and metal. By changing the external temperature, the structure has different beam deflection angles at different temperatures. At 1.4 THz, when the temperature is below 60 ℃, the beam deflection angle is 0°, when the temperature is between 60 ℃ and 72 ℃, the beam deflection angle is 36° and when the temperature is above 72 ℃, the beam deflection angle is 17°. This terahertz phase gradient metasurface based on VO₂ with different MIT temperatures provides a new way to flexibly control terahertz beams, and will have great application prospects in terahertz transmission, imaging, wireless communication, or other fields.

本文以金属-绝缘体转变（MIT）温度分别为60℃和72℃的二氧化钒（VO _{2 ）为对象，分析VO 2}转变前（绝缘体态）和转变后（金属态）两种状态的影响。态）MIT对双MIT VO ₂ （DMITV）单元结构的振幅和相位进行了MIT研究，构成了基于不同MIT温度的VO ₂太赫兹光束可重构相位梯度超表面，实现了太赫兹光束的灵活调节。该结构由两种不同MIT温度的VO ₂、聚四氟乙烯(PTFE)和金属组成。通过改变外部温度，该结构在不同温度下具有不同的光束偏转角度。 1.4 THz时，当温度低于60℃时，光束偏转角为0°，当温度在60℃至72℃之间时，光束偏转角为36°，当温度高于72℃时，光束偏转角为0°。角度为17°。这种基于不同MIT温度的VO ₂的太赫兹相位梯度超表面为灵活控制太赫兹光束提供了新的途径，在太赫兹传输、成像、无线通信等领域将具有巨大的应用前景。