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A comparison is presented of the effects of particle size, concentration, and detector depth on side scattering for linearly and circularly polarized incident Light. The scattering medium consists of various concentrations of part...
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A comparison is presented of the effects of particle size, concentration, and detector depth on side scattering for linearly and circularly polarized incident Light. The scattering medium consists of various concentrations of particles, which are either 1.24, 0.494, 0.36, 0.123, or 0.065 mu m in diameter, and which were mixed into filtered, distilled water and serve as the scattering centers. The results indicate that when this scattering medium is irradiated with linearly polarized laser light whose beam has been put through a quarter-wave plate in an effort to produce circularly polarized light, then there are two components scattered 90 degrees, that is, circularly and linearly polarized light. The amount of each component and the ratio to total intensity of scattered light are analyzed for the different particles. [References: 16]
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In this paper, we theoretically and experimentally report an achiral dual-band metasurface with linear birefringence. The unit cell of the achiral metasurface consists of non-twisted Q-shape metallic ring resonators with a stub br...
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In this paper, we theoretically and experimentally report an achiral dual-band metasurface with linear birefringence. The unit cell of the achiral metasurface consists of non-twisted Q-shape metallic ring resonators with a stub breaking the rotational symmetry. Moreover, due to the presence of the stub, we find the proposed metasurface emits dual-band circularly polarized wave with low transmission loss and high polarization extinction for a normal incident y-direction linearly polarized wave. We also systematically investigate the dependence of the electromagnetic response of the proposed structure on the geometric parameters. It is hoped that the proposed simple, easily fabricated model of achiral meta surface can be used in further polarization control applications (C) 2016 Elsevier B.V. All rights reserved.
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Atomic magnesium (Mg) is reported to ionize more efficiently in 400-nm laser fields with circular polarization (CP) than with linear polarization. This experimental result is reproduced qualitatively by numerical solutions of a tw...
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Atomic magnesium (Mg) is reported to ionize more efficiently in 400-nm laser fields with circular polarization (CP) than with linear polarization. This experimental result is reproduced qualitatively by numerical solutions of a two-electron time-dependent Schr?dinger equation. Theoretical analyses show that intermediate excited states play an important role during the ionization process. The 3s3p state and the 3s3d state are identified as the dominant intermediate states. The main ionization pathway is identified to be 3s~2 → 3s3p→ 3s3d → ionized states. CP laser fields are shown to be able to pump more population from the ground state to the 3s3d state, leading to more efficient ionization of the Mg atoms.
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It is found that the accelerated motion of a linear dielectric leads to its polarization. During the accelerated translational motion of a dielectric plate, the first surface in the acceleration direction becomes positively charge...
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It is found that the accelerated motion of a linear dielectric leads to its polarization. During the accelerated translational motion of a dielectric plate, the first surface in the acceleration direction becomes positively charged. For registration of polarization charges, the metal coatings were superimposed on the plate surfaces. The potential difference between the electrodes is proportional to the acceleration. At a constant acceleration, it increases with the increase in the dielectric surface area and dielectric constant and is almost independent of the thickness of the dielectric.
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In this work, first the necessary conditions for a versatile cross-polarization conversion meta-atom that operates both for linear and circular cross polarizations are discussed. Based on these, a versatile chiral metasurface cros...
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In this work, first the necessary conditions for a versatile cross-polarization conversion meta-atom that operates both for linear and circular cross polarizations are discussed. Based on these, a versatile chiral metasurface cross-polarization converter is proposed. The correspondence between its physical geometry and polarization domain characteristics is studied. To verify the design concept, a prototype is fabricated and measured. An effective vertical and horizontal linear cross-polarization conversion is achieved from 29.3 to 38.8 GHz (27.90%) and from 34.0 to 36.6 GHz (7.36%), respectively. Furthermore, the proposed converter also achieves circular polarization handedness rotation from 34.5 to 36.6 GHz (5.91%).
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In this paper we present the design, calibration method, and initial results of the Dual-Beam Imaging Polarimeter (DBIP). This new instrument is designed to measure the optical polarization properties of point sources, in particul...
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In this paper we present the design, calibration method, and initial results of the Dual-Beam Imaging Polarimeter (DBIP). This new instrument is designed to measure the optical polarization properties of point sources, in particular, Main Belt asteroids. This instrument interfaces between the Tek 2048 x 2048 camera and the University 2048 of Hawaii's 88 inch telescope and is available for facility use. Using DBIP we are able to measure linear polarization with a 1 sigma Poisson signal noise of 0.03% per measurement and a systematic error of order. In 0.06% +/- 0.02% addition, we discuss measurements of the polarization of the asteroid 16 Psyche that were taken as part of the instrument commissioning. We confirm Psyche's negative polarization of -1.037% +/- 0.006% but find no significant modulation of the signal with rotation above the 0.05% polarization level.
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? 2022 Elsevier B.V.We propose a bi-directional multi-function terahertz metasurface, which consists of photosensitive silicon and metal composite pattern, F4B-metal layer-Si3N4, photosensitive silicon and split metal ring composi...
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? 2022 Elsevier B.V.We propose a bi-directional multi-function terahertz metasurface, which consists of photosensitive silicon and metal composite pattern, F4B-metal layer-Si3N4, photosensitive silicon and split metal ring composite pattern from top to bottom layer. When terahertz wave is incident along +Z direction and the conductivity of the photosensitive silicon is 0 S/m, the metasurface behaves as y-polarization wave to x-polarization wave converter with a bandwidth of 3.82 THz. As the conductivity of the photosensitive silicon changes as 1 × 105 S/m, the proposed structure achieves linear-to-circular polarization converter. When terahertz wave is incident along -Z direction and the conductivity of the photosensitive silicon is 0 S/m, the structure exhibits as a band-stop filter with a stopband bandwidth of 20 GHz. Furthermore, the metasurface becomes a broadband tunable terahertz absorber when the conductivity of the photosensitive silicon changes as 1 × 105 S/m. Our proposed structure behaves bidirectional, switchable and multi-functional terahertz manipulation characteristics, providing a new perspective for multi-function terahertz device design.
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While halide perovskites (HPs) have achieved enormous success in the field of optoelectronic applications, much attention has been recently drawn to the unique polarization sensitivity of HPs, either intrinsic or extrinsic, which ...
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While halide perovskites (HPs) have achieved enormous success in the field of optoelectronic applications, much attention has been recently drawn to the unique polarization sensitivity of HPs, either intrinsic or extrinsic, which makes HPs a potential candidate for innovative applications in directly polarized luminescence and detection. Herein, the research status in the field of polarization-sensitive HPs, including linear polarization and circular polarization, is comprehensively summarized. To evaluate the effectiveness of HPs in generating and detecting linearly or circularly polarized light, the principles and characterization methods of polarized luminescence and detection are introduced. Sequentially, the state-of-the-art development of the strategies that induce the linear or circular polarization characteristics of HPs is systematically reviewed, based on which the application of polarization-sensitive HPs in the field of polarization luminescence and detection are summarized. Moreover, the current challenges and opportunities are discussed, and prospects of the future development in this promising field are outlined.
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Impact linear polarization in solar flares is studied with the Large Solar Vacuum Telescope (LSVT) using the spectral polarimetric method. This method makes it possible to minimize the effect of instrumental polarization with an e...
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Impact linear polarization in solar flares is studied with the Large Solar Vacuum Telescope (LSVT) using the spectral polarimetric method. This method makes it possible to minimize the effect of instrumental polarization with an error of up to 10-2 owing to the normalization of the spectral line intensity to the continuum spectrum intensity with negligible linear polarization. As a result, the Ha line intensity in two orthogonally polarized spectral stripes coincides in the absence of solar polarization. However, in the presence of linear polarization in a flare, the speciral polarimetric method does not rule out that the error can be present in determining the Stokes parameters Q and Ubecause of their possible relative "leakage." Linear instrument al polarization of LSVT has been performed using polaroid rotation before the major mirror. Twelve elements of a telescope matrix, characterizing linear polarization, have been determined. The usage of a matrix makes it possible to specify the observed Q and U values accurate to 10-3 of their magnitude
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