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. 2023 Mar 10;10(6):1726–1734. doi: 10.1021/acsphotonics.2c01727

Figure 3.

Figure 3

Volumetric reconstruction of a complex 3D object via refocusing: Teflon and sugar particles on plastic slabs. (a) Optical image of the sample. (b) Conceptual illustration of the sample’s composition. (c) Temporal response of the sample. (d) Fixed-time reconstructed images at the peak time. (e) Conceptual sketch of the imaging scheme: refocusing planes highlighted. (f, g) Spectral and phase images at 0.5 THz at the initial focal plane z = 0 μm. (h, i) Spectral and phase images at 0.5 THz averaged between z = 310 μm and z = 370 μm, showing Teflon’s contribution. (j, k) Spectral and phase images at 0.5 THz averaged between z = 510 μm and z = 570 μm, highlighting the sugar’s contribution. In all panels, the field of view is 4 mm × 4 mm with a 32 × 32 spatial sampling. The white bar represents the 500 μm scale. Supplementary videos are reported for the raw data (Videos S3 and S4).