Fig. 1. Assembly diagrams of electroplating cathode. (a) Fixing the sapphire plate and sticking Cu tape; (b) sticking protective tape for protection

Fig. 2. Diagram of the electroplating setup

Fig. 3. Schematic diagrams of microstructure replication process. (a) Sapphire plate with microstructure; (b) electroplating; (c) Ni plate with microstructure; (d) imprinting; (e) Sn plate with microstructure

Fig. 4. SEM images. (a) Sapphire plate; (b) Ni plate; (c) Sn plate

Fig. 5. Schematic diagram of the experimental setup

Fig. 6. Characteristic line intensity of Sn versus laser focus position

Fig. 7. Emission spectra of Sn lines at 380.1 nm with and without microstructure

Fig. 8. Signal intensity of Mn 260.57 nm analytical lines measured on the substrate with microstructure enriched different mass concentrations of Mg

Fig. 9. Calibration curves of Mn. (a) Substrate with microstructure; (b) substrate without microstructure