Fig. 4. WSe₂ quantum emitters with bowtie (BT) shaped pillars.

a AFM image of a WSe₂ monolayer flake deposited on a bowtie pair of triangular nanostructures. A single nanowrinkle connects the two structures and is visible both in the main image and in the SEM image of the corresponding inset. b The corresponding PL image, taken at T = 4 K, exhibits increased photon emission along the nanowrinkle connecting the triangles. The two orthogonal axes are given as a reference for the upcoming polarization-resolved spectrum and polar plot. Both a and b highlight the collection spot (Q1) for the characterized emitter. c The presented PL spectra are measured from emitter Q1 under parallel and orthogonal in-plane polarization with respect to the direction of the nanowrinkle, which coincides with the two orthogonal axes given in (b). d Corresponding polarization-resolved polar plot of the PL intensities from emitter Q1. The sinusoidal fitting reveals a degree of linear polarization of 92 ± 12%.