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

Md Samiul Islam Sarker, Takahiro Nakamura, Ali Hossain, Yuichi Kozawa, Shunichi Sato

Research output: Contribution to journalArticlepeer-review

Abstract

The nonlinear optical properties of Rh-Pd and Rh-Pt solid-solution alloy nanoparticles (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.

Original languageEnglish
Pages (from-to)2891-2900
Number of pages10
JournalOSA Continuum
Volume2
Issue number10
DOIs
Publication statusPublished - 2019 Oct 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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