Based on the brilliant property of butterfly Trogonoptera brookiana wings,the SiO2 replica of this bionic functional surface was successfully synthesized using a simple and high effective synthesis method combining a sol-gel process and subsequent selective etching.Firstly,the reflectivity of butterfly wing scales was carefully examined.It was found that the whole reflectance spectroscopy of the butterfly wings showed a lower level(less than 10%)in the visible spectrum.Thus,it was confirmed that the butterfly wings possessed a super light trapping effect.Afterwards,the morphologies and detailed architectures of the butterfly wing scales were carefully investigated using the ultra-depth three-dimensional microscope and field emission scanning electronic microscopy(FESEM).It was composed by the parallel ridges and quasi-honeycomb-like structure between them.Based on the biological properties and function above,an exact SiO2 negative replica was fabricated through a synthesis method combining a sol-gel process and subsequent selective etching.