Metasurface Based Spin‐Selective Wollaston‐and‐Rochon‐Prism‐Like Circularly Polarized Beam Splitter

Abstract

AbstractMultifunctional ultra‐thin devices which can manipulate the wavefront in a desired manner are preferably required for compact systems. In recent years, metasurfaces have been treated as an intuitive and powerful platform to expand the operational capacity of planar devices. In this work, a non‐interleaved device based on metasurfaces is proposed which utilizes transmitted co‐and‐cross polarization channels of circularly polarized (CP) light to design a spin‐switchable Wollaston‐and‐Rochon‐prism‐like CP beam splitter. In addition, this scheme facilitates the design of meta‐hologram that can decrypt two independent holographic images, one on each CP transmitted channel, under the right‐handed circularly polarized light. While, under the left‐handed circularly polarized light, the co‐polarization channel reconstructs the holographic image and no image appears on the cross‐polarization channel. The intended approach provides a promising route which will find application in information encryption/decryption, multichannel communication systems, and imaging.