@@ In a recent issue of Chinese Physics Letters, Wang et al.[1] proposed a method for determining orientation of transition dipole moments of single molecules. The suggested method is based on differences in electric field profile in fluorescence microscope produced by excitation light in epi-fluorescence illumination and total internal reflection illumination configurations, respectively. Here, we wish to draw attention to the fact that the same method based on identical physical principles has been already proposed and experimentally demonstrated by us in a publication which appeared more than one year before Wang's paper.
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