Fig. 1. Design and preparation of biomimetic structure. (a) Grid structure of butterfly wings^[30]; (b) biomimetic model；(c) sample preparation process

Fig. 2. Surface morphologies of processed samples

Fig. 3. Wettability test of samples. (a) Contact angle (CA) measurement results for different laser processing spacing values; (b) stability of static contact angle; (c) stability of rolling angle (SA); (d) droplet bounce performance, where (d-1) represents polished sample and (d-2) represents biomimetic sample; (e) adhesion test of biomimetic specimen surface

Fig. 4. Contamination/self-cleaning behavior of samples in different pollution environments. (a) Polished sample in dust environment; (b) biomimetic sample in dust environment; (c) polished sample in mud environment; (d) biomimetic sample in mud environment

Fig. 5. XPS test spectra of samples surfaces. (a1)－(c1) Polished sample; (a2)－(c2) biomimetic sample

Fig. 6. Schematics of droplet on biomimetic sample surface. (a) Surface contact diagram of droplet placed horizontally; (b) adhesion analysis diagram of droplet placed on a tilted surface