講演情報

[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.)

キーワード:

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).

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