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(a) Schematic illustration the fabrication route of the blank P-paper, (b) Schematic illustrations of the mechanism of preparing the invisible photonic prints, (c, d) Scanning-electron micrographs of P-paper, (c): unirradiated region; (d): irradiated region, (e-h) Obtained optical microscopy images of a cross-section of the printed P-paper under a vertically aligned external magnetic field.The depth of the destruction layer by UV-irradiation is approximately 350 μm deep.
