“…This approach has been used by several authors, both for orientation retrieval or vice versa for determination of χ (2) tensor elements for a given crystal symmetry. Specifically, in the literature, one can find polarization resolved emission traces for Fe(IO 3 ) 3 [72], BBO [73] KTP [27,28,74], LiNbO 3 [41,75], BaTiO 3 [38,76], ZnO [38], BFO [34]. One remarkable observation, mutual to several of these studies, is that the bulk tensorial elements χ ijk (2) can be safely applied to describe the response of these nanoobjects [37,41], even though for materials less characterized in their macroscopic form some discrepancies are present in the literature [34].…”