In In this paper, two low profile, single fed cavity backed slot antennas providing a circularly polarized (CP) wave are introduced. One of the antennas presents a right-handed CP (RHCP) wave, while the other one offers a left handed CP (LHCP) wave. The proposed antennas consist of a square shaped Substrtae Integrated Waveguide (SIW) cavity incorporatng two couples of radiating slots to radiate...

We have experimentally and theoretically shown that the circularly polarized beam bearing a singly charged optical vortex propagating through a uniaxial crystal can be split after focusing into the radially and azimuthally polarized beams in the vicinity of the focal area provided that the polarization handedness and the vortex topological charge have opposite signs.

We demonstrate the observation of spin-polarized photocurrent in InSb films grown on GaAs and InP substrates and InSb quantum wells where a nonequilibrium spin population has been achieved by using circularly polarized radiation. The characteristics of our observations indicated that the circular photo galvanic effect could be responsible for the generation of the photocurrents. © 2009 American...

Graduate School of Engineering, Chiba University, Chibashi, 263–8522 Japan 広帯域な円偏波特性をもつアンテナとしては,軸 モードのヘリカルアンテナ [2] や,直交する 2点から 90◦ 位相差で給電するパッチアンテナ [3] が報告され ている.一般に衛星通信移動局用アンテナでは,前述 の広帯域特性をもつアンテナをアレー化して利用して いる.ゆえに,10%程度の周波数帯域幅をもつ円偏波 の素子アンテナが必要となる.これまでに,このよう な衛星通信システムに適用可能な円偏波アレーアンテ ナの構成法について,いくつかの報告がなされている. 報告例を大別すると,広帯域な円偏波特性をもつ素子 アンテナで必要な帯域幅を確保する方法 [4]~[6] とア レーアンテナの構成を工夫して必要な帯域幅を確保す る方法がある [...

The existence of circular polarization in room-temperature protein phosphorescence is demonstrated, and time-resolved circularly polarized phosphorescence (TR-CPP) is used to characterize unique tryptophan environments in multitryptophan proteins. Circularly polarized luminescence studies provide information regarding the excited state chirality of a lumiphore which can be used to extract sensi...

Synthetic Aperture Radar (SAR) is a multipurpose sensor that can be operated in all-weather and day-night time. Recently, the SAR sensor is operated in linear polarization (HH, VV and its combination) with limited retrieved information. The characteristic of the conventional SAR sensor is bulky, high power, sensitive to Faraday rotation effect etc. Recently, we are developing the Circularly Pol...

We propose to measure the spin-dependent total cross section for circularly polarized photons absorbed on longitudinally polarized protons and neutrons in the photon energy range 2.5 < k < 5.5 GeV. This will be the first measurement of the difference between leftand right-handed polarized photoproduction above the resonance region. These data are needed to learn about the high energy convergenc...

We present a vector theory of four-wave mixing and use it to study the polarization-dependent nature of fourwave mixing and the conditions under which the gain of a dual-pump fiber-optic parametric amplifier becomes polarization independent. We find that in the absence of selfand cross-phase modulations, any pair of orthogonally polarized pumps can provide polarization-independent gain, but thi...

This paper presents the effect on circular polarization of multilayer circular annular ring patch (CARP). A CARP have been fabricated on FR4 substrate of dielectric constant 4.2 and thickness 1.52mm. Experimental resonant frequency impedance bandwidth and Axial ratio of simple CARP, covered CARP, spaced dielectric CARP and CARP with two superstrates have been measured and simulated using full w...

Traditionally, Atomic Beam Sources (ABSs) are used to produce targets of nuclear polarized Hydrogen (H) or Deuterium (D) for experiments using storage rings. Laser-Driven Sources (LDSs) o er a factor of 20-30 gain in the target thickness (however, with lower polarization) and may produce a higher overall gure of merit. The LDS is based on the technique of spin-exchange optical pumping where alk...