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Figure 4: Nanocomposites array for information encryption. (a) Digital image of the fabricated film which consists of six building blocks. The sequence of the six columns is film 0, 1, 2, 0, 1, 2. Scale bar is 1.0 cm. (b) Digital image showing the IR light source, sample stage and photodiode part of the homemade IR-photoelectric coupling system (on the right), and a common anode LED which connected to the system through ARDUINO (on the left). (c, d) Scheme showing the two decryption methods for the fabricated polymer film when using linearly Y-polarized light (c) and Z-polarized light (d), respectively. (e, f) Different voltage readings of the film when measured under the illumination of linearly Y-polarized light (e) and Z-polarized light (f). Insets: corresponding LED color when reading the specific column of the film.