Plasmonic fork-shaped hologram for vortex-beam generation and separation

Abstract

We introduce a multifunctional compact device that integrates a polarization beam splitter and an orbital angular momentum generator based on a plasmonic nano-aperture assisted detour phase meta-hologram. The proposed metasurface, which combines a phase singularity characterized fork hologram and polarization featured Λ -shaped antenna, achieves vortex generation and spin-based vortex splitting in transmission mode. Experimental demonstrations are launched under a linearly polarized incident beam, with polarization tomography as the analysis method. We expect this work to have applications in chip-level beam shaping and high-capacity communication.

Vortex beam: generation and detection of orbital angular momentum [Invited]

“…Other than the geometry phase, another dominant approach to design a metasurface is modifying the transmission phase by changing the meta-atoms, known as dynamic phase. The geometries of meta-atoms can be any shape ranging from cross slits [47,48] , nanofin [49] , and u-shaped slot [50] to v-shaped antenna [51,52] , etc. A typical metasurface based on dynamic phase is shown in Fig.…”

Plasmonic vortices: a review

“…Recently, metasurface technology has been widely applied as multifunctional metadevices in many aspects [70,71]. Meanwhile, such prominent manipulation ability makes it a great candidate to generate vortex beams as well [72,73]. Combined with the existing PVLs, specific phase distribution can be generated by plasmonic metasurfaces that further increase the degree of freedom to manipulate excited plasmonic field.…”

Design of Polarization-Independent Reflective Metalens in the Ultraviolet–Visible Wavelength Region

“…Metasurfaces [ 5 , 6 ], delicate arrays of subwavelength optical scatterers/resonators, can generate abrupt local phase change at a 2D interface, providing a unique opportunity to planarize and miniaturize most traditional optical elements. Due to their great capability to manipulate multiple degrees of freedom of light, including amplitude, phase, polarization and wave vector, metasurfaces are believed to be able to revolutionize traditional optical components such as flat lenses [ 7 , 8 ], beam deflectors [ 9 , 10 , 11 ], wave plates [ 12 , 13 ], meta-holograms [ 14 , 15 ], sensors [ 16 ], perfect absorbers [ 17 , 18 , 19 ], orbital angular momentum generators [ 20 , 21 , 22 ], etc.…”