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<p>This study investigates optical bistability (OB) in graphene-coated nanoparticles influenced by nearby dipole molecules and an external electric point charge. It is found that the extraordinary nonlinear optical properties of graphene, along with the molecular dipoles and electric charge interactions, can significantly modify the bistable behavior. Adjusting the dielectric environment and the spatial configuration of the molecules and charge allow precise control over OB behavior. The results show that the presence of dipolar molecules and their distance from the graphene-coated nanoparticle have a strong effect on the bistability threshold and the width of the bistability region. Also, the presence of an external electric charge leads to a change in the local field distribution around the nanoparticle and affects the bistability behavior.</p>

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Investigation of optical bistability from a graphene-wrapped nanoparticle near a pair of molecules and an electric point charge

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Milad Jalilian,
  • Ali Bahari,
  • Nader Daneshfar

摘要

This study investigates optical bistability (OB) in graphene-coated nanoparticles influenced by nearby dipole molecules and an external electric point charge. It is found that the extraordinary nonlinear optical properties of graphene, along with the molecular dipoles and electric charge interactions, can significantly modify the bistable behavior. Adjusting the dielectric environment and the spatial configuration of the molecules and charge allow precise control over OB behavior. The results show that the presence of dipolar molecules and their distance from the graphene-coated nanoparticle have a strong effect on the bistability threshold and the width of the bistability region. Also, the presence of an external electric charge leads to a change in the local field distribution around the nanoparticle and affects the bistability behavior.