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(a) Schematic of the experimental setup for the photothermal heterodyne holography method. (b) Photothermal holography image of a 10 nm gold nanosphere in the x–y plane. (c) Reconstruction of the same hologram as in (b) along the same dotted line in the x–z plane. Scale bars in (b) and (c) are both 5 μm. Adapted with permission from ref (131). Copyright 2010 The Optical Society (OSA).
