A reflective color filter showing polarization dependent is proposed, where on a SiO2 substrate, a Si-grating is embedded inside a dielectric Si3N4 overlay. By varying the period of the grating, cyan, magenta and yellow (CMY) colors are gained for the transverse electric (TE) polarized incidence. With the polarization of incident light changed from TE polarization to transverse magnetic (TM) polarization, the structure’s reflective color varies accordingly. Therefore, the proposed structure has application prospects in the field of anti-counterfeiting and color display.
By imparting local, space-variant phase changes on an incident electromagnetic wave, metasurfaces are capable of manipulating lights. These surfaces have been constructed from nanometallic optical antennas as well as high-index dielectric antennas. We introduce a unique scalable Fourier transform 4-f system that is applied to lithography. We demonstrate the experimental realization of a flexible Fresnel element, where pixelated one dimensional gratings with space-variant frequencies and orientations are assembled in low-index material as the UV resin on polyethyleneterephthalate (PET) substrate, achieving good concentration performance in the visible spectrum.