Fig. 4: Optical information writing and readout. | Light: Science & Applications

Fig. 4: Optical information writing and readout.

From: Reversible 3D optical data storage and information encryption in photo-modulated transparent glass medium

Fig. 4: Optical information writing and readout.

a, b, d The raw (a) and enlarged (b, d) photochromic logo patterns. c, e The enlarged luminescent logo pattern upon the 365 nm excitation. d, e The information data were hidden into the photochromic (d) or luminescent (e) two-dimensional code pattern, and the information “I love KUST” can be obtained by scanning the two-dimensional code pattern. Scale bar: 500 μm. f The scanning line width of focused 473 lasers. Scale bar: 40 μm. g The “KUST” alphabet (left) and the “tian dao chou qin” idiom (right) recorded into the transparent glass by binary format. Scale bar: 20 μm.

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