Fig. 1: Description of sample W1.
From: Edge-emitting polariton laser and amplifier based on a ZnO waveguide
a Scheme for the sample. The guided mode propagates along the Z-axis in the ZnO core. b Sketch of the lower branch (LPB) of an exciton-polariton guided mode. The arrows symbolize the absence of a finite energy minimum. c Scanning electron microscope (SEM) image of the SiO2 grating deposited on top of the waveguide. d SEM image of the sample showing two typical horizontal cracks here separated by 18 µm, nearly parallel to the grating
