We present dual-cavity based reflective structural color filters that can produce RGB additive colors featuring high purity and high efficiency. We decided to design a filter with a new wavelength by combining two classical MDM structure Fabry-Perot cavities with different resonant wavelength. A cavity medium with high refractive index leads to angle-invariant performance up to 50˚. Moreover, only deposition is involved so that the device can be easily scaled over a large area. The described approach may provide new avenues for various applications, such as reflective displays and surface coatings for decoration and solar cells.
We propose quad-layered transmissive structural color filters that can generate RGB primary colors with high purity and high brightness by utilizing interferences in dual Fabry-Perot (FP) cavities. Since there is a trade-off between color purity and brightness in a conventional single FP cavity, a peak separation in multiple FP cavities is exploited to achieve a more square-shaped spectral curve. Besides, controlling a resonance order in each cavity leads to a great suppression of a higher-order resonance for a red color filter. The presented results may be applied to various applications including display panels, decorations, and image sensors.
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