Scientists are looking for new materials to make thin optical films for a specific range of light. By using unconventional materials, they can make films that work better and cover more colors of light. The way the films are made affects how well they work. The scientists made some new thin films and tested how they work with different colors of light. They found out the films' properties like how much light they absorb and how they bend light. This helps improve how we make things like lenses and filters for different colors of light.