Fig. 3: Highly anisotropic PL emission in 1D vdW FRP.
From: Giant anisotropic photonics in the 1D van der Waals semiconductor fibrous red phosphorus
a PL spectra of a 1D vdW FRP flake under four different polarization configurations with the 532 nm excitation laser. The x (y) axis is parallel (perpendicular) to the b direction of 1D vdW FRP crystal. b–h Polar plots of emission intensity of P2–P8 as a function of polarization angle θ for copolarized (the polarizations of incident and emission light are parallel to each) and cross-polarized (the polarizations of incident and emission light are perpendicular to each) configurations. The red (blue) solid lines are fitted curves using a \(\,{{{{{{\rm{cos }}}}}}}^{2}\theta\) (\({{{{{{\rm{sin }}}}}}}^{2}\theta\)) function plus an offset. i The comparison of linear dichroism of FRP with the well-known quasi-1D van der Waals materials. The inset: the linear dichroism of P6 versus the polarization angle θ.
