Recently, the MIT Photonics and Modern Electromagnetics Research Group has achieved significant breakthroughs in the field of light wave conduction and control. They have developed a novel mechanism to precisely control the direction in which light waves travel. This groundbreaking research was recently published in the prestigious scientific journal *Science*. Researchers from the Department of Information and Electronic Engineering at Zhejiang University also played a crucial role in supporting this study. According to a reporter from China Economic Net, this innovative research, known as "Directional Selective Filter," is part of the MIT Solid State Photovoltaic Battery project. One of the most promising applications of this technology lies in improving industrial solar panels, with the potential to boost power generation efficiency from the current 15% to an impressive 80-90%. MIT researchers, in collaboration with Zhejiang University, have developed a new material system that allows light to pass through only from a specific direction, while light coming from other angles is reflected. This ensures that absorbed light is not scattered or lost, significantly enhancing the performance of solar panels. This advanced material system consists of two extremely thin layers, with each layer's thickness precisely controlled. According to a professor involved in the research, "Normally, when light hits the interface between two materials, some reflection occurs. However, there is a special angle called Brewster’s angle, where light incident at this angle does not reflect at all." The team utilized this principle to create a directional filter that controls the path of light waves with high precision. Shen Yichen, a third-year Ph.D. student in the Department of Applied Physics at MIT, explained, “Although only a small portion of light is reflected at each interface, when multiple layers are used, the cumulative effect causes most of the light to be reflected—except for the beam traveling along the Brewster angle. We used 80 carefully designed layers to achieve directional control over the entire visible light spectrum.†According to the reporter from China Economic Net, this technology has wide-ranging applications in photovoltaic cells, optical detection systems, and vehicle anti-jamming technologies. For example, traditional solar panels made of single-crystal silicon can only absorb sunlight with wavelengths below 1.2 μm, which accounts for about 37% of the total solar energy. This limitation greatly affects the efficiency of conventional solar panels. In contrast, MIT's Solid State Photovoltaic Cell Project introduces a new approach by capturing all wavelengths of sunlight and converting them into usable energy more effectively, leading to a significant improvement in power generation efficiency. In addition, directional selective filters can enhance optical detection systems such as telescopes, microscopes, and cameras. When used in photography, these filters allow the camera to capture only the light coming directly from the subject, reducing interference from backlighting and producing clearer images. In the automotive industry, applying this technology to windshields could help block glare from oncoming vehicles, improving driver safety. The U.S. military is also exploring the potential use of these filters to protect fighter pilots from laser-based interference, showing the broad impact of this innovation across multiple fields. Hard panel light, led film lighting, photography lighting, film shooting lights EV LIGHT Guangzhou Co., Ltd , https://www.evlightpro.com
Solid State Photovoltaic Battery 
Directional filter effect chart