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<p>This study investigates the influence of nanoparticle shape on the third-order nonlinear optical properties of silver nanostructures, specifically focusing on spherical nanoparticles and triangular nanoplates synthesized via a&#xa0;self-seeding growth method. Also, we report the strongly pronounced dependence of the nonlinear absorption coefficient on laser beam intensity for both morphologies. Open-aperture z‑scan measurements, performed at 532 nm within the absorption band of the study materials, reveal distinct plasmonic features and significant contributions to the increase in normalized transmittance for spherical Ag NPs. The physical mechanisms underlying this intensity dependence are discussed, and the extracted nonlinear absorption coefficients are compared, providing insight into the role of geometric anisotropy in modulating nonlinear optical responses. These findings, which differ from previously reported works, contribute to a&#xa0;broader understanding of shape-engineered plasmonic nanomaterials and their potential in photonic and optoelectronic applications.</p>

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Shape dependent nonlinear optical response of silver nanocrystals

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Majid Taheri,
  • S. Parhizkar,
  • H. Farrokhi

摘要

This study investigates the influence of nanoparticle shape on the third-order nonlinear optical properties of silver nanostructures, specifically focusing on spherical nanoparticles and triangular nanoplates synthesized via a self-seeding growth method. Also, we report the strongly pronounced dependence of the nonlinear absorption coefficient on laser beam intensity for both morphologies. Open-aperture z‑scan measurements, performed at 532 nm within the absorption band of the study materials, reveal distinct plasmonic features and significant contributions to the increase in normalized transmittance for spherical Ag NPs. The physical mechanisms underlying this intensity dependence are discussed, and the extracted nonlinear absorption coefficients are compared, providing insight into the role of geometric anisotropy in modulating nonlinear optical responses. These findings, which differ from previously reported works, contribute to a broader understanding of shape-engineered plasmonic nanomaterials and their potential in photonic and optoelectronic applications.