The effect of Ag on the structural, dielectric, linear and third-order nonlinear optical properties of graphitic carbon nitride nanosheets

In this work, g-C 3 N 4 and Ag/g-C 3 N 4 nanomaterials were prepared and their structural, dielectric and optical properties are compared. The UV-Vis spectrophotometry, XRD pattern, FESEM image, FTIR spectroscopy, KK method and Z-scan measurements were applied to characterize the obtained nanomaterials. The Z-scan method was used to analyze third-order nonlinearity studies such as the nonlinear refractive (NLR) index, n 2 , and nonlinear absorption (NLA) coefficient, beta by using Nd: YAG laser with 50 mW power at 532 nm under different concentration of Ag/g-C 3 N 4 nanostructure. The impact of concentration on the nonlinear optical (NLO) properties have been investigated in detail. NLO properties of the Ag/g-C 3 N 4 nanostructure are enhanced, reaching values of 2.99 x 10 -8 cm 2 /W and 6.53 x 10 -4 cm/W for the third-order NLR and NLA coefficients, respectively. In addition, this material possesses large optical characteristics in the IR region. The complex refractive index and dielectric coefficient of Ag/g-C 3 N 4 nanostructure is investigated. Moreover, the Ag/g-C 3 N 4 nanostructure's IR light responsiveness has significantly improved. The red shifts of longitudinal and transversal frequencies for Ag/g-C 3 N 4 is more visible than g-C 3 N 4 . This research might lead to fresh ideas and a new way to make high-stability supported Ag optical devices.