Dragonfly-Eye-Inspired Artificial Compound Eyes with Sophisticated Imaging

Abstract: Underwater superoleophobic surfaces have attracted increasing interest because of their remarkable antioil ability and wide range of promising applications. In the meantime, femtosecond laser microfabrication becomes a rising star in the field of micro/nanomanufacturing based on the advantages of negligible heat‐affected zone, no‐contact process, precise ablation threshold, and high resolution. The collision of femtosecond laser microfabrication and achieving underwater superoleophobicity finally produces some colorful fireworks. In this review, the recent progress of femtosecond‐laser‐induced underwater superoleophobic surfaces, mainly including materials, fabrication, properties, multifunctions, and applications, is summarized. The related background is first introduced to show the principle for creating an underwater superoleophobic surface and the unique features of femtosecond laser. Based on the principle of “from in‐air superhydrophilicity to underwater superoleophobicity,” underwater superoleophobicity is achieved on different kinds of materials surfaces by simple femtosecond laser ablation. Furthermore, the femtosecond‐laser‐induced underwater superoleophobic surfaces can also be endowed with some additional properties such as controllable oil adhesion, underwater anisotropic oil wettability, good transparency, and durability, leading to the resultant surfaces that have various practical applications. The development of underwater superoleophobicity is still in its “toddler stage,” so the existing challenges and future prospects of this growing field are discussed finally.

TL;DR: In this article , an inside-out femtosecond laser deep scribing technology in combination with etching process for fabricating bio-inspired micro/nanostructures with high-aspect-ratio on sapphire was reported.

TL;DR: In this paper, the femtosecond (fs) laser-structured superhydrophobic or underwater superoleophobic porous materials have been applied in effective oil/water separation.

TL;DR: In this article, the characteristics and development of femtosecond laser direct writing, spatial light modulator-based fabrication and interference-based approaches are reviewed and typical applications and approaches related to the manufacturing of cutting-edge optical devices including microlens arrays, micro/nano gratings, photonic crystals, and optical fibers are summarized.

TL;DR: A lack of blood flow can kill nerve cells, by causing a massive influx of calcium ions, but what's happened to the cellular mechanisms for coping with excess calcium?

TL;DR: Experimental results show that the system can detect an object with angular accuracy of better than 1 mrad, demonstrating the feasibility of the proposed compound eye system.

TL;DR: The cross-sectional anatomical structures of ten different types of compound eyes provide a clear indication to understand their functions and even to utilize the optical schemes for advanced photonic sensors, as illustrated in Figure 1.

TL;DR: In this paper, the rotational displacement microlens array (MLA) diffuser is applied to the laser homogenization system to obtain the best optical performance, and the double-sided MLAs diffusers with new design parameter were successfully fabricated using single pulse femtosecond laser assisted chemical wet etching.