Metasurface has the ability to manipulate electromagnetic wave in the subwavelength range, and has great application potential in stealth, detection, nuclear magnetism, high magnetic field, solar energy and microwave energy utilization, so it has been paid great attention. The physical properties of vanadium dioxide can change from semiconductor phase to metal state under certain temperature conditions, and the change is reversible. By using vanadium dioxide to design and fabricate metamaterials, temperature controlled multifunctional metamaterials can be made. This metamaterial has a much wider range of applications. Metamaterials based on vanadium dioxide have developed rapidly in recent years. Researchers have used vanadium dioxide to switch terahertz waves from spectral to spatial characteristics, tuning and dynamic control. One promising application of metamaterials is the realization of high-quality holograms. Metamaterials designed with vanadium dioxide can be used to make temperature-dependent dynamic holography. Vanadium dioxide can also be used in the optical band to regulate the absorption and reflection of photoelectric devices. In this paper, the research status in these related fields is reviewed.
Vanadium dioxide film can be used to anti-laser interference infrared detector. If the laser energy is strong enough, the film may also be damaged under laser irradiation. VO2 thin films were prepared on sapphire substrates by molecular beam epitaxy. The laser damage threshold test of VO2 film was designed. VO2 film was irradiated with 1064 nm laser, and the damage characteristics of the film were observed by metallographic microscope. The damage threshold of the film was determined according to the damage morphology. The experimental equipment of laser pretreatment to enhance the film damage threshold was set up, and the laser energy of 20%-90% of the film damage threshold was used to pretreat the film. It is found that there is an optimal pretreatment energy for raising the damage threshold of vanadium dioxide films by laser pretreatment, and the optimal pretreatment energy is 60% of the damage threshold energy. The damage threshold of vanadium dioxide films pretreated with this energy was increased by about 31%.
Incoherent strong light beams have been widely used in military, anti-terrorism and anti-drug fields. The transmission of the light beam in the atmosphere is affected by the absorption of the atmosphere, the scattering and refraction of particles in the atmosphere, so that the energy of the strong light beam is continuously attenuated during the transmission process. In order to study the atmospheric transmission characteristics of incoherent strong light beams under different conditions, a theoretical model for the transmission of incoherent strong light in the atmosphere was established, and the Modtran model was used to simulate and calculate the visible light atmospheric transmittance under different visibility conditions. On this basis, the illuminance of the incoherent strong beam after the attenuation of different atmospheric distances is further calculated. The results show that as the visibility decreases, the atmospheric transmittance decreases rapidly, and the illumination of the incoherent strong beam is greatly attenuated. The research results can provide some theoretical support for the in-depth application of incoherent strong beams in military and anti-terrorism fields.
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