Ultrafast nonlinear absorption properties of Ag/Sb2Se3 composite films in the near-infrared region

To explore the nonlinear absorption(NLA) properties of the Sb2Se3 composite system, Ag/Sb2Se3 composite films were prepared by magnetron sputtering at room temperature, and part of the films were annealed under 300 degrees C. The NLA properties were investigated using femtosecond(fs) Z-scan technology under 800 nm. The results showed that Ag/Sb2Se3 and annealed-Ag/Sb2Se3 composite films exhibited reverse saturated absorption(RSA) and saturated absorption(SA), respectively. The results indicated that annealing could tunable the NLA types of composite films. Furthermore, Ag can strengthen the NLA properties of the Ag/Sb2Se3 composite films compared with the single Sb2Se3. By increasing Ag sputtering power and incident laser energy, the NLA properties of composite films are enhanced. This study provides a new perspective for the application of Ag/Sb2Se3 composite films in optoelectronic devices.

Automated summary

This study investigates the nonlinear absorption properties of Ag/Sb2Se3 composite films. Annealing was found to tune the nonlinear absorption types of the films, and the addition of Ag was able to enhance the nonlinear absorption properties compared to single Sb2Se3. Increasing Ag sputtering power and incident laser energy further enhanced the nonlinear absorption properties of the composite films.