Figure 2
From: Optically reconfigurable polarized emission in Germanium
Power-dependent PL characteristics and Stokes analysis. (a) Direct gap photoluminescence (PL) spectra measured at 4 K and under various excitation power densities in a n-type bulk Ge wafer; (b) Color-coded map of the PL peak intensity as a function of the angle of the polarization analyser for different pump power densities. (c) Normalized Poincaré sphere of the polarized PL component as obtained by dividing the Stokes parameters derived from the modulation pattern of (b) by the total intensity of the light field48.
