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<p>Branched Rh−Os nanotrees, which are synthesized through a surfactant- and seed-free colloidal procedure, have anisotropic structures measuring 80–150&#xa0;nm and 15–25&#xa0;nm, respectively. High-resolution TEM and XPS render bimetallic alloy formation with small oxidation. UV–Vis-NIR spectra show that the broadband absorptions have plasmonic shoulders at ~ 520&#xa0;nm and ~ 780&#xa0;nm due to transverse and longitudinal localized surface plasmon resonances. The structures exhibit reverse saturable absorption, a nonlinear absorption coefficient of 7.3 × 10<sup>−8</sup>&#xa0;cm/W, and an optical limiting threshold of 0.70 GW/cm<sup>2</sup> under 800-nm femtosecond laser excitation. The simulations conducted using the finite-difference time-domain (FDTD) method demonstrate more than a 15-fold increase in field conditions at the tips of branches and junction points, whereas the calculated density functional theory (DFT) shows a high density of the d-band near the Fermi level. All these effects present a very bright third-order nonlinear optical response. The research presents the value of morphology-based localization in fields and alloy synergies, which makes Rh−Os nanotrees a potential use in ultrafast optical and nonlinear optical limitation.</p>

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Self-Guided Assembly of Ligand-Free Rh–Os Nanotrees Revealing Plasmonic Branching Pathways, Tip-Enhanced Field Localization, and Femtosecond-Induced Third-Order Nonlinear Optical Effects

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Ravindra Prathap Singh,
  • N. Nagabhooshanam,
  • Yogendra Thakur,
  • Abhilasha Jadhav,
  • C. Ramesh Kumar,
  • G. Vijaya Lakshmi,
  • A. Rajaram

摘要

Branched Rh−Os nanotrees, which are synthesized through a surfactant- and seed-free colloidal procedure, have anisotropic structures measuring 80–150 nm and 15–25 nm, respectively. High-resolution TEM and XPS render bimetallic alloy formation with small oxidation. UV–Vis-NIR spectra show that the broadband absorptions have plasmonic shoulders at ~ 520 nm and ~ 780 nm due to transverse and longitudinal localized surface plasmon resonances. The structures exhibit reverse saturable absorption, a nonlinear absorption coefficient of 7.3 × 10−8 cm/W, and an optical limiting threshold of 0.70 GW/cm2 under 800-nm femtosecond laser excitation. The simulations conducted using the finite-difference time-domain (FDTD) method demonstrate more than a 15-fold increase in field conditions at the tips of branches and junction points, whereas the calculated density functional theory (DFT) shows a high density of the d-band near the Fermi level. All these effects present a very bright third-order nonlinear optical response. The research presents the value of morphology-based localization in fields and alloy synergies, which makes Rh−Os nanotrees a potential use in ultrafast optical and nonlinear optical limitation.