Nonlinear optical properties of Rh-Pd and Rh-Pt solid-solution alloy nanoparticles prepared by a laser-induced nucleation method in aqueous solution

Islam Sarker (1) , Takahiro Nakamura (2) , Ali Hossain (1) , Yuichi Kozawa (2) , Shunichi Sato (2)

1 RU - Department of Physics, University of Rajshahi, Bangladesh
2 Tohoku University [Sendai]

The nonlinear optical properties of Rh-Pd and Rh-Pt solid-solution alloy nanopar-ticles (NPs) were experimentally investigated by means of the z-scan technique. The open aperture (OA) measurement showed a reverse saturable behavior, whereas the closed aperture (CA) measurement showed a peak-and valley-shape. Both the Rh-Pd and Rh-Pt NPs exhibited a positive nonlinear optical index of refraction at 800 nm relating to the self-focusing phenomenon. In addition, the nonlinear absorption of the Rh-Pt NPs (4.39 × 10 −12 cm/W) was higher than that of the Rh-Pd NPs (1.63 × 10 −12 cm/W) due to the small interval between the occupied and unoccupied density of states (DOS) of Rh-Pt than Rh-Pd. The nonlinear responses of the Rh-Pd and Rh-Pt NPs was attributed to the hot electron contribution and the reverse saturation of intraband and interband transitions.

Domaines: Physique [physics]; Matière Condensée [cond-mat]; Science des matériaux [cond-mat.mtrl-sci]

Islam Sarker, Takahiro Nakamura, Ali Hossain, Yuichi Kozawa, Shunichi Sato. Nonlinear optical properties of Rh-Pd and Rh-Pt solid-solution alloy nanoparticles prepared by a laser-induced nucleation method in aqueous solution. OSA Continuum, 2019, 2 (10), pp.2891-2900. ⟨10.1364/OSAC.2.002891⟩. ⟨hal-02366447⟩