Fig. 1. Schematic diagram of laser incident film system under different states. (a) Dielectric phase; (b) metal phase

Fig. 2. Change of transmittance of single layer vanadium dioxide with thickness of film

Fig. 3. Structure distribution of multilayer film system

Fig. 4. Function of temperature and time under different pulse intensities under constant pulse duration τ=60 ps

Fig. 5. Temperature distribution diagram

Fig. 6. Functional relationship between temperature and time of VO₂

Fig. 7. Functional relationship between VO₂ metal phase fraction, refractive index, and temperature

Fig. 8. Temperature and transmittance as a function of time when multiple pulse excitation films are applied

Fig. 9. Comparison of transmittance of film system before and after refractive index optimization