Abstract
Here, we have reviewed some typical plasmonic structures based on Archimedes’ spiral (AS) architectures, which can produce polarization-sensitive focusing phenomenon and generate plasmonic vortices (PVs) carrying controllable orbital angular momentum (OAM) because of the relation between the incident polarized states and the chiralities of the spiral structures. These features can be used to analyze different circular polarization states, which has been one of the rapidly developing researching topics in nanophotonics in recent years. Many investigations demonstrate that the multifunctional spiral-based plasmonic structures are excellent choices for chiral selection and generating the transmitted field with well-defined OAM. The circular polarization extinction ratio, as an evaluation criterion for the polarization selectivity of a designed structure, could be effectively improved by properly modulating the parameters of spiral structures. Such functional spiral plasmonic nanostructures are promising for applications in analyzing circular polarization light, full Stokes vector polarimetric sensors, near-field imaging, and so on.
Highlights
Polarization, as one of the basic properties of the light, is widely used in modern sensor systems [1], by which the important information of reflecting objects can be obtained and recognized because there are different polarization characteristics for different objects
\textOmega brought about extensive investigations for optical in polarization selection, extrinsic component of the orbital angular momentum (OAM) originating from the spiral of the beam around the axis of
The field into the far-field region effectively, if the rotation direction of polarization light is opposite the chirality analyzer are increased by 39.53%
Summary
Polarization, as one of the basic properties of the light, is widely used in modern sensor systems [1], by which the important information of reflecting objects can be obtained and recognized because there are different polarization characteristics for different objects. The emerged nano-scale metallic structures, which produce a strongly polarization-dependent optical response, can be a promising alternative for obtaining polarization information. Such Archimedes’ spiral plasmonic structures can be used as the circular polarization analyzer for replacing a quarter wave plate combined with a linear polarizer, which will offer the possibility for potentially miniature integration. \textPsi spiral phase profile of the beam around the axis of 03A8 propagation These spiral structures have the spin angular momentum (SAM), associated with the handedness of circular polarizations, and the. \textOmega brought about extensive investigations for optical in polarization selection, extrinsic component of the OAM originating from the spiral of the beam around the axis of.
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