  Due to their intriguing optical properties, including stable and chiral
excitons, two-dimensional transition metal dichalcogenides (2D-TMDs) hold the
promise of applications in nanophotonics. Chemical vapor deposition (CVD)
techniques offer a platform to fabricate and design nanostructures with diverse
geometries. However, the more exotic the grown nanogeometry, the less is known
about its optical response. WS2 nanostructures with geometries ranging from
monolayers to hollow pyramids have been created. The hollow pyramids exhibit a
strongly reduced photoluminescence with respect to horizontally layered
tungsten disulphide, facilitating the study of their clear Raman signal in more
detail. Excited resonantly, the hollow pyramids exhibit a great number of
higher-order phononic resonances. In contrast to monolayers, the spectral
features of the optical response of the pyramids are position dependent.
Differences in peak intensity, peak ratio and spectral peak positions reveal
local variations in the atomic arrangement of the hollow pyramids crater and
sides. The position-dependent optical response of hollow WS2 pyramids is
characterized and attributed to growth-induced nanogeometry. Thereby the first
steps are taken towards producing tunable nanophotonic devices with
applications ranging from opto-electronics to non-linear optics.
