Fig. 6: SA properties of 1–3 L and bulk PdSe2 flakes.
From: Giant nonlinear optical activity in two-dimensional palladium diselenide
a–c Nonlinear transmittance of 1–3 L PdSe2. The blue, green, and yellow dots represent the experimental data, while the solid red lines show the fitted results using the SA model. The SA intensities of 1, 2, and 3 L PdSe2 are 0.98, 1.1, and 1.2 GW cm−2, respectively. The modulation depths of 1, 2, and 3 L PdSe2 are 32%, 27%, and 24%, respectively. d Nonlinear transmittance of the bulk PdSe2. The white and red dots represent the experimental data, while the black and red solid lines show the fitting curves of few-layer and bulk PdSe2 using the SA model. The inset shows a reverse SA trend of the thick bulk PdSe2 with increased laser power. e The electronic transition process of SA. All the above measurements were performed under 600 nm excitation.
