Revealing local structural properties of an atomically thin MoSe₂ surface using optical microscopy.

ABSTRACT: Using a triangular molybdenum diselenide (MoSe₂) flake as surface-enhanced Raman spectroscopy (SERS) platform, we demonstrate the dependency of the Raman enhancement on laser beam polarization and local structure using copper phthalocyanine (CuPc) as probe. Second harmonic generation (SHG) and photoluminescence spectroscopy and microscopy are used to reveal the structural irregularities of the MoSe₂ flake. The Raman enhancement in the focus of an azimuthally polarized beam, which possesses exclusively an in-plane electric field component is stronger than the enhancement by a focused radially polarized beam, where the out-of-plane electric field component dominates. This phenomenon indicates that the face-on oriented CuPc molecules strongly interact with the MoSe₂

SUBMITTER: Pan L 

PROVIDER: S-EPMC9263549 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature