Core Viewpoint - A revolutionary light focusing technology has been developed that can confine light beams to extremely small spaces comparable to their own wavelength, potentially leading to breakthroughs in photonic chips and quantum communication [1] Group 1 - Researchers from the Netherlands Institute for Atomic and Molecular Physics, Delft University of Technology, and Cornell University have collaborated on this innovative technology [1] - The method utilizes the unique properties of photonic crystals, allowing for a broader wavelength range and the formation of extremely high-intensity localized light fields [1] - The findings have been published in the latest issue of the journal "Science Advances" [1]

Core Viewpoint - The article discusses the development of advanced stealth materials using photonic crystals, highlighting the innovative research and engineering efforts of a team led by Professor Shi Jiaming at the National University of Defense Technology, aimed at enhancing military equipment's stealth capabilities against various detection methods [1][2][3]. Group 1: Research and Development - The need for improved stealth protection for military equipment has become urgent due to advancements in electronic reconnaissance and precision-guided technologies [2]. - The research began with the exploration of photonic crystals, which can manipulate electromagnetic waves by adjusting their optical properties, although they were initially only in the experimental stage [2][3]. - The team successfully developed a theoretical model to block specific frequency electromagnetic waves by designing the periodic structure of photonic crystals [2][3]. Group 2: Engineering and Testing - The team progressed to the engineering phase, creating small samples of photonic crystals and testing their effectiveness on silicon substrates, which showed promising results [4]. - However, challenges arose when transitioning to flexible fabric substrates, leading to extensive trials and adjustments to the manufacturing process [5][6]. - After three years of dedicated efforts, the team overcame significant technical hurdles to enable the large-scale production of flexible photonic crystal films [6][7]. Group 3: Multi-band Detection Solutions - The team faced new challenges in achieving infrared stealth for high-temperature targets while also addressing laser and radar detection, which required different approaches [7]. - A novel concept called "spectral hole drilling" was developed to create specific transmission channels within the photonic crystal structure, allowing for effective stealth across multiple detection bands [7][8]. - Successful tests demonstrated that the stealth materials did not compromise the performance of the radar systems while effectively evading detection [8]. Group 4: Future Directions - The team continues to optimize their processes and technologies, with a focus on rapid innovation and adaptation to enhance combat capabilities [8]. - The emphasis on developing new quality combat power aligns with national directives to leverage advanced technologies for military applications [8].