High Efficient Anti-reflection Tailoring The Nano Lattice Structure Of Compound Eyes

The nanometer-scale architectures that biological members using are proved to be an ideal ultra-black structure; there exist some special examples of nano-lattice structure in nature, the micro-structures of which are of great significance for our research work. Compound eye structure is one of the most famous. For instance, some butterflies/moths use hexagonal arrays of nonclose-packed (ncp) nipples as anti-reflection coatings (ARCs) to reduce reflectivity from their compound eyes.In this work , a vacuum sintering process is invited to fabricate anti-reflection nano structures from certain butterflies/moths compound eyes on technologically important carbon materials, in order to improve the performance of light harvesting for carbon materials.Then, the samples are characterized by Fluorescence microscope, Three-dimensional microscope of KEYENCE, field emission scanning electron microscope (FESEM), Raman spectra measurements and analysis software, UV-Vis spectroscopy and Near Infrared spectroscopy. The results show that a new nano lattice structure ultra-black material was obtained with better anti-reflection properties than ordinary ones. Through this effective bio-inspired templating technique, the replicas well retained the original microstructure and geometry features, which significantly improved the ultra-black level in the near ultraviolet and visible light, due to the enhancement of photon collection efficiency. The optical properties of the nano structure carbon materials showed an obvious enhanced light harvesting capability in the UV-Vis-NIR wavelength range.With this interesting process to fabricate the nano lattice structure of butterflies/moths compound eyes on technologically important carbon materials, we provide a new idea and design to improve ultra-black material properties. And Nature inspires us that, even with relatively simple materials, so long as we have the rational structure of micro-compact design, we can effectively improve the optical properties of our materials.