The research group of Professor Zhong Minlin from the School of Materials Science and Technology of Tsinghua University published the research result titled “General Method for Realizing Very Low Reflectivity by Two-level Regulation of Micro-nano Structures on Metal Surfaces” in the Journal of the American Chemical Society (Impact Factor 13.942). This achievement proposes a new method for preparing a two-level micro-nano dual-scale composite structure based on ultra-fast laser pulse injection control on metal surfaces. This method can be achieved by dexterous control of the number and method of pulse injection during ultra-fast laser pointer processing The micro-scale structure and the nano-scale structure can be effectively controlled separately, so that the geometric trapping effect of the micro-scale structure and the equivalent dielectric effect of the nano-scale structure can be exerted at the same time.
This is the latest research progress in the use of ultrafast lasers in controllable micro-nano fabrication. This method is effective for various metals such as copper (Cu), titanium (Ti), tungsten (W), etc. It can obtain 1.4%, 0.29%, and 2.5% of the lowest known metal surface reflectance on its surface. A general method for controllably constructing micro-nano composite functional structures on metal surfaces. A new method of ultra-fast laser pulse injection for two-level control of micro-nano dual-scale structures on metal surfaces
The surface micro-nano composite structure has important applications in the fields of anti-reflection, self-cleaning, and high-efficiency catalysis, and the controllable preparation of the surface micro-nano structure is the core issue. Ultrafast laser processing is a well-known micro-nano manufacturing method, and it has outstanding advantages in the efficient, flexible and controllable processing of micron-scale structures. However, most of the nanostructures formed are induced during the processing of microstructures. Cannot be effectively controlled.
Other nanomanufacturing methods, such as electron beam lithography and chemical synthesis, can form controllable nanostructures, but they cannot effectively construct micro-nanocomposite structural features. The results of this paper break the limitation that the ultra-fast red laser pointer can only control the micron-scale structure before, and take a solid step in the dual-level control of the micro-nano dual-scale structure, which is the surface micro-nano composite functional structure. The effective construction provides new ideas and methods.
Two-level control of the micro-nano structure on the metal surface and excellent anti-reverse performance. Obtain the darkest artificial metal surface. The corresponding author of the paper is Professor Zhong Minlin of the School of Materials Science, and the first author is Fan Peixun, a postdoctoral fellow of the School of Materials Science. This achievement is the result of a joint collaboration between Professor Zhong Minlin’s group of the School of Materials Science, Academician Jin Guofan and Associate Professor Bai Benfeng of the Department of Precision Instruments, and has taken advantage of the two disciplines of materials and optics. This work was supported by major international cooperation projects and general projects of the National Natural Science Foundation of China.