Vanadium dioxide（VO2） is a phase transition material which undergoes a reversible metal-insulator transition（MIT） when triggered by thermal, photo, electrical, and even stress. The huge conduction change of VO2 renders it a promising material for terahertz（THz） manipulation. In this paper, some interesting works concerning the growth and characteristics of the VO2 film are selectively reviewed. A switching of THz radiation by photo-driven VO2 film is demonstrated. Experiments indicate an ultrafast optical switching to THz transmission within 8 picoseconds, and a switching ratio reaches to over 80% during a wide frequency range from 0.3 THz to 2.5 THz.
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