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oe1(光电查) - 科学论文

2 条数据
?? 中文（中国） ▾

  • Formation of enhanced opposite one-handed chiral fields in heterodimer-film nanostructures

    摘要： Plasmonic chirality has attracted a lot of interests because it could result in dramatically increased chiroptical interactions and offer many potential applications in chiral molecules analysis, catalysis, and other nanotechnology. In particular, one-handed chiral field is required in many applications for the reason that molecules are generally distributed randomly in some region of structures. In this work, benefiting from the coupling effect and energy focusing effect, we propose a heterodimer-film nanostructure to achieve one-handed chiral fields under linearly polarized light illumination. The results indicate that there are just opposite one-handed chiral fields in different gaps of the heterodimer-film nanostructure. The volume averaged optical chirality in the gaps can reach 102 and the optical chirality of hot spots can reach 103, which has potential applications in chiral sensing and Raman optical activity.

    关键词： heterodimer-film nanostructure,Raman optical activity,one-handed chiral fields,chiral sensing,Plasmonic chirality,optical chirality enhancement

    更新于2025-09-10 09:29:36

  • Heterodimer on MgO

    摘要： We report on the magnetic properties of HoCo dimers as a model system for the smallest intermetallic compound of a lanthanide and a transition metal atom. The dimers are adsorbed on ultrathin MgO(100) films grown on Ag(100). New for 4f elements, we detect inelastic excitations with scanning tunneling spectroscopy and prove their magnetic origin by applying an external magnetic field. In combination with density functional theory and spin Hamiltonian analysis, we determine the magnetic level distribution, as well as sign and magnitude of the exchange interaction between the two atoms. In contrast to typical 4f ? 3d bulk compounds, we find ferromagnetic coupling in the dimer.

    关键词： ferromagnetic coupling,heterodimer,density functional theory,spin excitations,scanning tunneling spectroscopy

    更新于2025-09-04 15:30:14