Trifoci metalens element using twofold polarization-selective metasurfaces for linearly polarized visible light

摘要

In the trifoss metalens device using a polarization-selective metasurface for linear polarization, the triposi metalens device includes a first rectangular shape formed of hydrogenated amorphous silicon (a-Si:H) in a central portion of a first SiO 2 substrate. A PMM unit cell comprising a nano-pillar, wherein a cross-section of one side of the first nano-pillar is aligned parallel to the x-axis of the first substrate; A second SiO 2 In the central portion of the substrate, including a quadrangular second nano-pillar formed of hydrogenated amorphous silicon (a-Si:H), one side cross-section of the second nano-pillar is 45° of the x-axis of the second substrate. PCM unit cells aligned in parallel; Including, wherein the triposi metalens is a functional interleaving arrangement by mixing the PMM unit cell and the PCM unit cell, wherein the PMM unit cell performs an independent phase shift with respect to two orthogonal polarizations, and a PCM unit cell is characterized in that the arrangement is performed to simultaneously perform linear polarization conversion and phase shift.