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UV/IR cut filters block ultraviolet (UV) and infrared (IR) light, filtering out specific wavelength ranges to protect image sensors and enhance image quality. For example, they prevent color distortion caused by infrared light and block UV to avoid sensor degradation.
Based on design, they are divided into absorptive and interference types: absorptive types use special materials to absorb targeted wavelengths and have a simple structure; interference types use evaporation or sputtering techniques to stack high and low refractive index films, allowing precise control over cutoff wavelengths and optical properties.
These film layers can also be extended to applications such as wearable devices, laser windows, and architectural glass, where they are designed as infrared reflective or Low-E coatings to improve thermal management and protective performance.
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