Vanadium dioxide films on ZnO-buffered LiNbO3 substrates for active gradient metasurfaces
Maxim Ochkurov 1, Maxim Kutepov 1, Gevork Karapetyan 1, Evgenii Kaidashev 1, Vladimir Kaydashev 1;
1 Southern Federal University, Rostov-on-Don, Russia
Abstract
VO2-based metasurfaces with insulator to metal transition (MIT) triggered by heat, electric current or laser light are expected to boost the development of active THz/middle IR flat optics. Recently we found new intriguing memory effect in VO2/TiO2/LiNbO3 films which opens up new possibilities in the design of active gradient metasurfaces controlled only by electric currents [Materials 2023, 16, 2579]. In this study we characterize the MIT features of VO2/ZnO/LiNbO3 composites. We use our recently developed method that exploits surface acoustic waves to simultaneously accurately monitor the altered temperature and electric conductivity of the composite films during MIT. In contrast to VO2/TiO2 films which show quite abrupt MIT curve at 76-87 °C the VO2/ZnO films reveal much more gradual transition which is occurred at lower temperature in the range of 25-55 °C.
Research was funded by Russian Science Foundation, grant № 24-29-00175 at SFU
Speaker
Maxim Ochkurov
Southern Federal University
Russia
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