ИСТИНА

A number of strategies have been proposed to reduce the VO2 MIT temperature including chemical doping, stoichiometry engineering, epitaxial strain and hydrogenation. Noteworthy is the fact that a decrease in the critical temperature upon tungsten doping occurs practically without a decrease in the THz modulation depth, moreover, the THz transmission hysteresis loop is usually narrowing, which is very important for the design of devices with fast response. The soft chemistry methods hydrothermal method and chemical vapor deposition both are the most effective approach for the synthesis of VO2 metastable polymorphes with unique crystallites morphology. In this work, we expanded the capabilities of hydrothermal method, directing it to the growth of oriented crystallites in self-organized systems on the single crystal substrates. THz and IR devices with VO2 as the key components exhibit remarkable response to external actions, which is not only applicable in THz modulators but also in rewritable optical memories.