[10a-E201-1~11] 3.11 Nanoscale optical science and near-field optics

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[10a-E201-9] Evaluation of LSPR properties of B8₁-type Pt-based intermetallic compounds using dielectric functions FDTD simulation

〇HYUNJI LEE¹, Haruka Takekuma^1,2, Toshiharu Teranishi^1,2 (1.Kyoto Univ., 2.ICR, Kyoto Univ.)

Keywords:

Intermetallic compound,Nanoparticle,Localized Surface Plasmon Resonance

Localized surface plasmon resonance (LSPR) is typically observed in Au and Ag nanoparticles. However, intermetallic compounds have recently attracted attention as alternative plasmonic materials, because their optical properties can be systematically tuned through their crystal structure and composition. The B8₁ structure is an anisotropic crystal structure, from which unique optical properties are expected. In previous studies, novel LSPR properties were discovered in B8₁-PtSn nanoparticles. In this study, bulk samples of B8₁-PtM (M = Sn, Sb, Pb, Bi) were synthesized, and their dielectric functions were determined by ellipsometrymeasurements. Using the obtained dielectric functions, finite-difference time-domain (FDTD) simulations were performed to investigate the LSPR properties. In particular, the simulations focused on the shape dependence of extinction spectra to clarify how the anisotropic dielectric function manifests in the LSPR spectra depending on particle shape.