Optimization of the Thickness Dependent Third Order Optical Nonlinearities of 2D Bi2Se3 layers
Résumé
The thickness-dependent saturable absorption behaviour of atomically thin bismuth selenide films has been optimized using 515 nm and 1030 nm laser excitation wavelengths. The studies have been performed by the Z-scan technique employing 400 fs laser pulses emitted by a fiber laser at a repetition rate of 100 Hz. The obtained results allowed the determination of the nonlinear optical parameters as a function of the film thickness. Additional studies have been carried out in order to determine the third order optical nonlinearities as a function of the annealing temperature. The samples have been also studied by spectrophotometry, electron microscopy and X-ray diffraction, which allowed a deeper knowledge of the optical properties, as well as the crystalline structure of the Bi2Se3 material.
Domaines
Physique [physics]
Origine : Fichiers produits par l'(les) auteur(s)