Fig. 2: Helical dichroism in amorphous solids.
From: Intrinsic dichroism in amorphous and crystalline solids with helical light

a HD (Type I) for fused silica (blue) and borosilicate (red) as a function of displacement of the singularity with linearly polarized (ϵ = 0.05) asymmetrical OAM beam (l = ± 3). b Orientation-dependent transmission of l = ± 3 in fused silica at δ = −1200 nm. The error bars in (a) represent the standard error, of multiple measurements (n = 3), calculated for an average fluence range used to obtain HD. The error bands in (b) represent the standard error at every position of the crystal for n = 20 points.