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 article, the authors proposed a method based on general relations between the reflection and transmission coefficients and the polarizabilities of arbitrary bi-anisotropic particles to synthesize different polarization-transforming devices realized as arrays of small particles.
Abstract: We study the possibility of analytically synthesizing different polarization-transforming devices realized as arrays of small particles. The proposed method is based on general relations between the reflection and transmission coefficients and the polarizabilities of arbitrary bi-anisotropic particles. As an example, we reveal all possible types of inclusions which can be used to realize twist polarizers, select one of them and synthesize a novel twist polarizer. The synthesized twist polarizer is then fitted on a standard printed circuit board, optimized numerically, and finally manufactured and measured. The experimental results for the twist polarizer show good correspondence with the simulations and the new method is found to be a useful tool for developing any polarization-transforming devices. As one more example, a novel circular polarization selective surface is synthesized.
209 citations
TL;DR: With these newly developed optical elements the complete polarization analysis of soft-x-ray synchrotron radiation can be extended to the water-window range from 300 to 600 eV.
Abstract: The design of a versatile high-precision eight-axis
ultrahigh-vacuum-compatible polarimeter is presented. This
multipurpose instrument can be used as a self-calibrating polarization
detector for linearly and circularly polarized UV and soft-x-ray
light. It can also be used for the characterization of reflection
or transmission properties (reflectometer) or polarizing and
phase-retarding properties (ellipsometer) of any optical
element. The polarization properties of Mo/Si, Cr/C, Cr/Sc,
and Ni/Ti multilayers used in this polarimeter as polarizers in
transmission and as analyzers in reflection have been investigated
theoretically and experimentally. In the soft-x-ray range, close to
the 2p edges of Sc, Ti, and Cr, resonantly enhanced phase
retardation of the transmission polarizers of as much as 18° has been
measured. With these newly developed optical elements the complete
polarization analysis of soft-x-ray synchrotron radiation can be
extended to the water-window range from 300 to 600 eV.
208 citations
TL;DR: In this paper, four compact asymmetric-slit microstrip antennas were proposed and studied for circular polarization by cutting asymmetrical slits in diagonal directions onto the square microstrip patches, the single coaxial feed microstrip patch antennas were realized for circularly polarized radiation with compact antenna size.
Abstract: Four compact asymmetric-slit microstrip antennas are proposed and studied for circular polarization. By cutting asymmetrical slits in diagonal directions onto the square microstrip patches, the single coaxial-feed microstrip patch antennas are realized for circularly polarized radiation with compact antenna size. The performances of the proposed antennas with several asymmetric-slit shapes onto the patch radiators are compared. The measured 10-dB return loss and 3-dB axial-ratio bandwidths of the antenna prototype are around 2.5% and 0.5%, respectively. The proposed asymmetric-slit configurations are useful for compact circularly polarized microstrip patch antennas and array design.
208 citations
TL;DR: The unit cell of the doubly-periodic metamaterial design is optimized using the genetic algorithm for maximum circular dichroism and for maximum optical activity.
Abstract: Planar chiral metamaterials comprising double-layer dielectricmetal- dielectric resonant structures in the shape of a gammadion are presented in the near-infrared regime. The unit cell of the doubly-periodic metamaterial design is optimized using the genetic algorithm for maximum circular dichroism and for maximum optical activity. A circular dichroism value in excess of 50% is predicted for the optimized design. Maximum polarization rotatory powers in terms of the minimum allowed transmittances are also obtained and presented.
207 citations
TL;DR: In this paper, several linearlypolarized and circularly-polarised transmit-arrays are designed and demonstrated in the 60 GHz band and a theoretical analysis is presented for the optimization of the power budget with respect to the F/D ratio.
Abstract: Several linearly-polarized and circularly-polarized transmit-arrays are designed and demonstrated in the 60-GHz band. These arrays have a fairly simple structure with three metal layers and are fabricated with a standard printed-circuit board technology. The simulation method is based on an electromagnetic model of the focal source and the unit-cells, associated to an analytical modeling of the full structure. A theoretical analysis is presented for the optimization of the power budget with respect to the F/D ratio. Several prototypes are designed and characterized in V-band. The experimental results are in very good agreement with the simulations and demonstrate very satisfactory characteristics. Power efficiencies of 50-61% are reached with a 1-dB gain bandwidth up to 7%, and low cross-polarization level.
203 citations