Nanoimaging of the Edge-Dependent Optical Polarization Anisotropy of Black Phosphorus.

ABSTRACT: The electronic structure and functionality of 2D materials is highly sensitive to structural morphology, not only opening the possibility for manipulating material properties but also making predictable and reproducible functionality challenging. Black phosphorus (BP), a corrugated orthorhombic 2D material, has in-plane optical absorption anisotropy critical for applications, such as directional photonics, plasmonics, and waveguides. Here, we use polarization-dependent photoemission electron microscopy to visualize the anisotropic optical absorption of BP with 54 nm spatial resolution. We find the edges of BP flakes have a shift in their optical polarization anisotropy from the flake interior due to the 1D confinement and symmetry reduction at flake edges that alter the electronic charge d

SUBMITTER: Joshi PP 

PROVIDER: S-EPMC9052752 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature