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Raster scan of a nanorod sample under HeLa cells using (a) a long-pass filter and (b) a short-pass filter for photoluminescence detection. Some rods can be observed in both images, some others only in the Stokes or anti-Stokes images. Intensities in the Stokes and anti-Stokes emission thus do not necessarily correlate. The scale bar in both panels is 2 μm in length. To see this figure in color, go online.
