Fig. 1. Schematic diagram of patterned Cu micro-nano structure prepared by laser ablation

Fig. 2. SEM images of Cu micro-nano structure prepared at scanning speed of 100 mm/s with different laser powers（Illustration is Fast Fourier Transform spectrum）

Fig. 3. SEM images of Cu micro-nano structure prepared at laser power of 2 W with different scanning speeds （Illustration is a Fast Fourier Transform spectrum）

Fig. 4. SEM images of Cu micro-nano structure prepared with different scanning times at laser power of 2 W and scanning speed of 50 mm/s（illustration is Fast Fourier Transform spectrum）

Fig. 5. EDS and element mapping images of Cu micro-nano structure prepared by scanning 4 times

Fig. 6. XRD spectra of patterned Cu micro-nano structure

Fig. 7. Evolution of patterned Cu micro-nano structure by laser ablation in liquid

Fig. 8. Schematic of droplets on superhydrophobic surfaces with low adhesion （Cassie-Baxter state） and high adhesion （Cassie-impregnating state）

Fig. 9. Water contact angle and oil contact angle of patterned Cu micro-nano structure with different scanning times

Fig. 10. Shape of droplets when patterned Cu micro-nano structure were vertical and inverted