Third-order optical nonlinearities of exfoliated Bi2Te3 nanoparticle films in UV, visible and near-infrared ranges measured by tunable femtosecond pulses

We characterize the nonlinear optical properties of synthesized Bi2Te3 nanoparticle-contained thin films using the tunable femtosecond laser in the spectral range of 400-1000 nm. These nanoparticles possess a strong saturable absorption and positive nonlinear refraction (-6.8x10(-5) cm W-1 in the case of 500 nm, 150 fs probe pulses, and 3x10(-10) cm(2) W-1 in the case of 400 nm, 150 fs probe pulses, respectively). The spectral, intensity, and temporal variation of saturable absorption and nonlinear refraction of the thin films containing exfoliated Bi2Te3 nanoparticles are discussed. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

In this study, the nonlinear optical properties of synthesized Bi2Te3 nanoparticle-contained thin films were investigated using a tunable femtosecond laser. The results show strong saturable absorption and positive nonlinear refraction in these nanoparticles, with values of -6.8x10(-5) cm W-1 at 500 nm and 150 fs probe pulses, and 3x10(-10) cm(2) W-1 at 400 nm and 150 fs probe pulses, respectively. The spectral, intensity, and temporal variations of saturable absorption and nonlinear refraction in the thin films containing exfoliated Bi2Te3 nanoparticles were discussed.