Circular polarization

About: Circular polarization is a research topic. Over the lifetime, 15201 publications have been published within this topic receiving 234418 citations.

Structure and polarization of active region microwave emission

Abstract: Active region radio emission observations made at 6.16 cm wavelength during May 20-27, 1980, are the bases of maps of total intensity and circular polarization presented for the three regions whose Hale numbers are 16850, 16863, and 16864. A detailed comparison is made between these maps and on- and off-band H-alpha pictures and magnetograms. The neutral lines with which the strongest sources were associated have their two opposite polarities close to each other, implying a high magnetic field gradient, and are also associated with arch filament systems. A detailed analysis is undertaken of observations of the circular polarization sense inversion in region 16863. The large scale structure of the magnetic field can be approximated by a dipole with its axis inclined by 11 deg with respect to the photosphere, and with a dipole moment of about 2 x 10 to the 31 power cgs units.

Comparison of linearly and circularly polarized probes of second-order optical activity of chiral surfaces

Abstract: We compare two nonlinear‐optical techniques for measuring chirality of isotropic surfaces. One technique measures the difference in the efficiency of surface second‐harmonic generation between the cases of left‐hand and right‐hand circularly polarized fundamental light and the other measures the difference in the efficiency between the cases of fundamental light linearly polarized −45° and +45° with respect to the p‐polarized direction. A nonzero difference in either case indicates chirality, where no difference should be measured for an isotropic achiral surface. We examine the complementariness of these two techniques theoretically and experimentally. In experiments utilizing thin films of a chiral poly(isocyanide), we measure the second‐harmonic response as a function of the state of polarization of the fundamental light when manipulated by both quarter and half waveplates. We extract the circular and linear differences from these more complete measurements and find the largest circular and linear diff...

Polarization gating and circularly-polarized high harmonic generation using plasmonic enhancement in metal nanostructures

Abstract: We investigate possibilities to utilize field enhancement by specifically designed metal nanostructures for the generation of single attosecond pulses using the polarization gating technique. We predict the generation of isolated 59-attosecond-long pulses using 15-fs pump pulses with only a 0.6 TW/cm2 intensity. Our simulations also indicate the possibility to generate previously inaccessible high-harmonics with circular polarization by using an ensemble of vertically and horizontally orientated bow-tie structures. In the numerical simulation we used an extended Lewenstein model, which includes the spatial inhomogeneity in the hot spots and collisions of electrons with the metal surface.

A linear to circular polarization converter based on Jerusalem-Cross frequency selective surface

Abstract: In this paper a transmission type polarizer is presented to convert linear polarization to circular polarization Based on a frequency-selective surface, this polarizer consists of Jerusalem Crosses printed on a RT 5870 substrate The tuning of inductive arms and capacitive coupling between the unit cells have helped in achieving desired axial-ratio performance for the transmitted wave The polarizer works at 178 GHz and provides the required 90° phase difference between the two orthogonal components, which are equal in magnitude The structure provides around 99% polarization purity at the resonance Theoretical analysis and results of numerical investigations related to the structure are presented

3D stereo OLED display

Abstract: A switchable stereoscopic display system, wherein the switchable stereoscopic display system can display two-dimensional and three-dimensional images, includes: an organic light emitting diode (OLED) display device; Electronics that rapidly updates individual OLEDs; and a linearly polarizer for the OLED display device. Additionally, a circular polarizing layer changes light from linearly polarized light to circular polarized light. A polarization layer, on top of the circular polarization layer, switches a polarization direction of emitted light within the OLED display device. Other electronics switches the polarization direction within independent segments of the polarization layer. Refreshed OLEDs are synched with the independent segments of the polarization layer.