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. 2020 Nov 20;14(12):16414–16445. doi: 10.1021/acsnano.0c07638

Figure 4.

Figure 4

(a) Relative photothermal signal zp scan predicted by nanolens diffraction theory for an on-axis detection; i.e., the detection angle is close to zero (θ = 0). The laser offset Δzf = 0 resulting in a symmetric two-lobed pattern. The radius of the particle is R = 10 nm. Adapted with permission from ref (97). Copyright 2012 The Optical Society (OSA). (b) Photothermal signal zx scan for different Δzf offsets for a gold nanoparticle with a radius of R = 30 nm in a polymer medium (polydimethylsiloxane). Adapted with permission from ref (99). Copyright 2013 Dr. Markus Selmke. (c) Photothermal signal zp scan for different Δzf offsets (different colors) for a gold nanoparticle with a radius of R = 30 nm in polydimethylsiloxane. Adapted from ref (25). Copyright 2012 American Chemical Society.