[17a-A34-1~9] 4.1 Plasmonics and Nanophotonics

11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)English Presentation

[17a-A34-9] Probing Forbidden Low-Frequency Raman Modes in MoS₂ via Plasmonic Nanoparticle

〇(D)Zhen Zong¹, Ryosuke Morisaki¹, Kanami Sugiyama², Masahiro Higashi³, Takayuki Umakoshi¹, Prabhat Verma¹ (1.Osaka Univ., 2.Kyoto Univ., 3.Nagoya Univ.)

Keywords:

Low-Frequency Raman,SERS,2D materials

Interlayer interaction through the van der Waals forces in two-dimensional (2D) materials like molybdenum disulfide (MoS₂) determine most of the layer properties, which shows up as low-frequency modes (less than 50cm^-1) in Raman scattering. But the weak low-frequency signals are often obscured by background noise, requiring enhancement techniques. Furthermore, detecting forbidden low-frequency Raman modes poses additional challenges. These modes, suppressed by symmetry selection rules, provide important information into molecular structures and electronic properties but are not observed in conventional Raman spectroscopy as they are symmetry forbidden. Our approach can detect forbidden low-frequency modes and achieve high-sensitivity through low-frequency surface-enhanced Raman spectroscopy (LF-SERS).