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From left to right: optical, two-photon fluorescence, and second-harmonic generation images. From top to bottom: as synthesized MIL-53(Al)-NH2/NO2 (1), MIL-53(Al)-NH2/NO2 (2), and MIL-53(Ga)-NH2/NO2 (3). The SHG images display the average intensity of linearly polarized laser light, calculated over 60 images, each image being 3° apart in polarization direction of the incident polarized beam. The scale bars indicate a distance of 10 μm for each image.
