All-dielectric metasurface with ultrahigh color filtering and polarization-independent/dependent characteristics

The all-dielectric metasurface-based color filter (CF) has attracted huge interest in many fields due to its excellent optical properties. We present four metasurface-based CFs with different shapes on quartz substrates to generate blue (B), green (G), and red (R) spectra with high color purity. CFs show the maximum reflection intensities of 99.6% (B), 99.7% (G), and 95.1% (R), and their spectra bandwidths are 14, 16, and 13 nm for RGB colors, respectively. These proposed metasurface-based CFs possess high color saturation and ultra-narrow bandwidths. In addition, CFs with different shapes show the tunability of color switching and polarization-dependent characteristics. These CF designs will potentially benefit reflective display technologies, and the ultrahigh color filtering characteristics of CF-1 and CF-2 are particularly useful for high-resolution color printing and micro-LED. Moreover, the polarization-dependent characteristics of CF-3 and CF-4 make it possible for them to be applied as polarization switches, tunable color switches, and so on.