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25 October 2018 Polarization-dependent reflective colors incorporating meta-gratings with an asymmetric profile
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A reflective color filter based on the standing-wave resonance is proposed, incorporating an asymmetric cross-shaped aluminum grating on top, a sandwiched silicon nitride layer and an aluminum mirror at bottom. By varying the length of grating arms or the polarization of incident lights, reflective colors as cyan, magenta and yellow can be obtained conveniently. Specially, reflections show good angular tolerance up to 60° for transverse electric polarization, while they demonstrate high sensitivity to incident angles of transverse magnetic polarization. Furthermore, the black color can be realized in reflection by encoding four gratings into one pixel at the optical diffraction limit. The color filter proposed here has great potential in applications as reflective LCD, full color printing and anti-counterfeiting.
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Shangliang Wu Sr., Yan Ye, and Linsen Chen "Polarization-dependent reflective colors incorporating meta-gratings with an asymmetric profile", Proc. SPIE 10824, Plasmonics III, 1082418 (25 October 2018);

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