[17p-WL2_201-1~16] 3.11 Nanoscale optical science and near-field optics

3:30 PM - 3:45 PM JST(6:30 AM - 6:45 AM UTC)

[17p-WL2_201-8] Quasi-BIC resonant SHG effect of rectangular-shaped Si nanoparticle dimer structure

〇Takahiro Nakashima¹, Masayoshi Kamiya¹, Atushi Sugita¹ (1.Shizuoka Univ.)

Keywords:

Si nanoparticle,nonlinear optics,quasi-bound state in the continuum

This paper reports second harmonic generation (SHG) in a two-dimensional periodic array of rectangular Si nanoparticle dimer. The study aims to significantly enhance the surface second-order nonlinear susceptibility by utilizing a high-Q resonance via quasi-bound state in the continuum (qBIC). The structures combining size-shifted and position-modified designs only exhibited strong SHG signals due to field enhancement caused by the high-Q resonance and the broken centro-symmetry.