DiffractiveOpticalElements ChemicalCompound 2dMaterials CastIron CntFilm ring shape SurfaceOxidation DeflectionOptics FastScan BismuthVanadate hard_disk_media CrossSection StainlessSteel PVAC FAPbI3 Dimethicone Boundary Solar LateralForce CuSubstrate exfoliate SAM domain_switching MetalCompound Led Defect FM-KPFM FrictionalForce Nickel Mapping Potential ScanningKelvinProbeMicroscopy cannabis Permalloy OpticalElement