High-color-purity, high-brightness and angle-insensitive red structural color

We propose a simple five-layer structure for creating red structural color, which has high color purity and brightness. The design is based on the superposition of silver substrate multilayer silicon material. Absorption at shorter wavelengths effectively guaranteed, reflection longer well enhanced. peak reflectivity 91% colorimetric 0.9. Moreover, designed displays angle-invariant performance up to 60°. This kind scheme environmentally friendly with low fabrication cost, it can play an important role in variety fields, such as image sensors.