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Recent studies of Transition Metal Dichalcogenides (TMDs) have revealedexciting optical properties like stable excitons and chiral light-matterinteractions. Chemical vapor deposition (CVD) techniques provide a platform forthe fabrication of nanostructures with diverse geometries, ranging fromhorizontal flakes to flower-like structures. Raman spectroscopy is commonlyused to characterize TMDs and their properties. Here, we usepolarization-resolved Raman spectroscopy to probe the nanogeometry andorientation of WS2 nanoflower petals. Exciting the nanoflowers with linearlypolarized light, we observe an enhanced Raman response from flower petalsoriented along the excitation polarization direction. Furthermore, thehelicity-resolved Raman response of vertically oriented wall-like flower petalsexhibits clear differences with horizontally oriented flakes. Although thephotoluminescence from the nanoflowers is strongly reduced, the Raman responseupon excitation in resonance with the WS2 excitonic transition does reveal thepresence of the exciton, which results in a distinct temperature dependence ofthe Raman response.

Revealing the nanogeometry of WS2 nanoflowers by polarization-resolved Raman spectroscopy