Fig. 2
From: Photo-activated raster scanning thermal imaging at sub-diffraction resolution

Proof-of-principle experiments. a, f Transmitted-light images of microfiche samples. b, e Temporal maximum projection of the raw thermo-camera image stacks acquired with modulated illumination on the samples in a and f, respectively; acquisition parameters: NxxNy = 120 × 36, δx = 34.4 μm, Δx = 60, Δy = 6, τon = 300 ms, P = 4.6 mW, beam 1/e2 diameter 56 ± 2 μm in b, NxxNy = 160 × 42, δx = 15.3 μm, Δx = 160, Δy = 6, τon = 300 ms, P = 15 mW, beam diameter 22 ± 1 μm in e. c, g Super-resolution images of the samples in a and f, obtained from the image stacks employed for b and e, respectively; ΔTmin = 0.3 °C in c, 0.7 °C in g. d Black: intensity profile along the dashed line in a upon a lookup-table inversion on the image; red: ΔTmax profile along the dashed line in c. h Black: average intensity profile along the vertical direction in f upon lookup-table inversion; red: average ΔTmax profile along the vertical direction in g with contrast percentages between adjacent peaks. In d, h, uncertainties on ΔTmax values equal the thermo-camera sensitivity 0.1 °C and x-axis error bars for non-zero ΔTmax values are extrapolated from the σx, y-versus-ΔTmax plot. Scale bars = 500 μm.