A nonlinear optical limiting VO2 thin film for smart light protection

Recent advancements in laser technology have spurred the development of high-power light sources, creating an urgent need for effective defensive mechanisms to counter potential high-power light attacks. Consequently, optical limiting has emerged as a crucial requirement in applications involving high-power light sources and sensitive photodetectors. In this study, vanadium dioxide (VO 2 ), a phase transition material, is chosen as a nonlinear optical limiting medium, leveraging its insulator-metallic transition (IMT) to achieve intelligent light protection. The VO 2 films exhibit superior optical limiting performance, with the phase transition threshold significantly reduced through optimization of absorption properties and tungsten (W) doping. This approach presents a promising platform for the design of nonlinear optical limiting systems, offering practical solutions for high-power light protection applications. • Simulations show light absorption and heat dissipation in VO 2 thin films. • Phase transition behavior is tailored by adjusting thickness and W doping. • A 2 at% W-doped film achieves phase transition at 24 °C for practical applications. • VO 2 films show optical limiting threshold of 6.5 W/cm 2 at room temperature.