Topic
Circular polarization
About: Circular polarization is a research topic. Over the lifetime, 15201 publications have been published within this topic receiving 234418 citations.
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TL;DR: In this paper, the effect of magnetoactive plasma on the subpulse polarization patterns from radio pulsars is considered. But the effect is limited to the case where the magnetic field lines bend slowly out of the emission cone in the near magnetosphere.
Abstract: We consider the effect of the magnetoactive plasma on the subpulse polarization patterns from radio pulsars. The radiation is presumed to originate from a very relativistic plasma streaming out along open field lines, either from curvature acceleration of charge bunches or from the acceleration parallel to the guiding magnetic field associated with the formation of the bunches. The different polarizations of subpulse rays within a relativistically narrowed emission cone are ordered by adiabatic walking as the curved magnetic field lines bend slowly out of the emission cone in the near magnetosphere. Essentially 100% polarization averaged over the rays within the emission cone can be achieved even if the initial average polarization over these rays is very much less or even zero. Sudden orthogonal mode transitions appear to have a natural explanation. Expected asymmetries between the posively and negatively charged components of the magnetoactive plasma would introduce circular polarization components into the polarization pattern even while adiabatic walking continues in the far magnetosphere. These give rise to promising models for describing the rich variety of elliptical polarization and rapid position-angle variation seen in some subpulses.
93 citations
TL;DR: In this paper, isolated points of circular polarization in transverse fields of varying polarization are classified morphologically into three distinct types known as lemons, stars, and monstars, and these morphologies are interpreted here according to two natural parameters associated with the singularity, namely, the anisotropy of the C point and the polarization azimuth.
Abstract: C points, that is, isolated points of circular polarization in transverse fields of varying polarization, are classified morphologically into three distinct types known as lemons, stars, and monstars. These morphologies are interpreted here according to two natural parameters associated with the singularity, namely, the anisotropy of the C point and the polarization azimuth on the anisotropy axis. In addition to providing insight into singularity morphology, this observation applies to the densities of the various morphologies in isotropic random polarization speckle fields.
93 citations
TL;DR: In this article, the spin and electron hole recombination lifetimes in a CoFe∕MgO(100) tunnel spin injector are inferred from the circular polarization of light emitted from a GaAs-based quantum well (QW) detector.
Abstract: The spin polarization of electrons injected into GaAs from a CoFe∕MgO(100) tunnel spin injector is inferred from the circular polarization of light emitted from a GaAs-based quantum well (QW) detector. The circular polarization strongly depends on the spin and electron hole recombination lifetimes in the QW. Using time-resolved optical techniques, we show that these lifetimes are highly temperature dependent. A peak in the charge lifetime versus temperature is likely responsible for the previously observed dip in the electroluminescence polarization. Evidence for a temperature-independent spin injection efficiency of ∼70% from 10 K to room temperature is found.
93 citations
TL;DR: The present bottom-up method would allow the large-scale and cost-effective fabrication of chiral materials and further applications to functional materials and devices.
Abstract: The chirality of materials results in a wide variety of advanced technologies including image display, data storage, light management including negative refraction, and enantioselective catalysis and sensing. Here, we introduce chirality to plasmonic nanostructures by using circularly polarized light as the sole chiral source for the first time. Gold nanocuboids as precursors on a semiconductor were irradiated with circularly polarized light to localize electric fields at specific corners of the cuboids depending on the handedness of light and deposited dielectric moieties as electron oscillation boosters by the localized electric field. Thus, plasmonic nanostructures with high chirality were developed. The present bottom-up method would allow the large-scale and cost-effective fabrication of chiral materials and further applications to functional materials and devices.
92 citations
TL;DR: Both radially polarized and azimuthally polarized beams can be decomposed into linear combinations of circularly polarized vortex beams having opposite vortex charges using a specially designed vortex sensing diffraction grating.
Abstract: Both radially polarized and azimuthally polarized beams can be decomposed into linear combinations of circularly polarized vortex beams having opposite vortex charges. We show experimental evidence for this decomposition using a specially designed vortex sensing diffraction grating that generates multiple vortex patterns having different senses of circularly polarization in the different diffracted orders. When this grating is illuminated with a radially or azimuthally polarized beam, the grating separates the components into different diffracted orders. Experimental results are shown.
92 citations