scholarly journals A Tunable Graphene 0–90° Polarization Rotator Achieved by Sine Equation Voltage Adjustment

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 849 ◽  
Author(s):  
Jinsong Dai ◽  
Zhongchao Wei ◽  
Lin Zhao ◽  
Qiyuan Lin ◽  
Yuyao Lou
Keyword(s):  
Fermi Level ◽  
Polarized Light ◽  
Light Polarization ◽  
Polarization Angle ◽  
Polarization Rotator ◽  
Terahertz Region ◽  
Linearly Polarized ◽  
Optic Communication ◽  
Radially Polarized ◽  
Sine Equation

Polarization Manipulation has been widely used and plays a key role in wave propagation and information processing. Here, we introduce a polarization rotator in the terahertz range with a polarization conversion ratio up to 99.98% at 4.51 terahertz. It has a single graphene layer on top of the structure patterned by 45° tilted space elliptical rings. By changing the Fermi level from 0.3 ev to 0.7 ev of the graphene, we can turn the reflective light polarization direction between 0° to 90° with nearly unique magnitude. Surface currents theories and graphene characteristics clarify the relationship between polarization angle and Fermi level to be a sine equation adjusted voltage. We firstly put forward an equation to thetunable graphene changing the reflective light polarization angle. It can be widely used in measurement, optic communication, and biology. Besides, with nearly the unique reflective light in different directions, the rotator is designed into a novel radially polarization converter. The latter can be switched from radially polarized light to linearly polarized light, and vice versa, in the terahertz region.

scholarly journals Constraints on Lorentz Invariance Violation with Multiwavelength Polarized Astrophysical Sources

Galaxies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 44
Author(s):  
Qi-Qi Zhou ◽  
Shuang-Xi Yi ◽  
Jun-Jie Wei ◽  
Xue-Feng Wu
Keyword(s):  
Gamma Ray ◽  
Lorentz Invariance ◽  
Polarized Light ◽  
Polarization Plane ◽  
Polarization Angle ◽  
Intrinsic Polarization ◽  
Frequency Dependent ◽  
Invariance Violation ◽  
Linearly Polarized ◽  
Order Of Magnitude

Possible violations of Lorentz invariance (LIV) can produce vacuum birefringence, which results in a frequency-dependent rotation of the polarization plane of linearly polarized light from distant sources. In this paper, we try to search for a frequency-dependent change of the linear polarization angle arising from vacuum birefringence in the spectropolarimetric data of astrophysical sources. We collect five blazars with multiwavelength polarization measurements in different optical bands (UBVRI). Taking into account the observed polarization angle contributions from both the intrinsic polarization angle and the rotation angle induced by LIV, and assuming that the intrinsic polarization angle is an unknown constant, we obtain new constraints on LIV by directly fitting the multiwavelength polarimetric data of the five blazars. Here, we show that the birefringence parameter η quantifying the broken degree of Lorentz invariance is limited to be in the range of −9.63×10−8<η<6.55×10−6 at the 2σ confidence level, which is as good as or represents one order of magnitude improvement over the results previously obtained from ultraviolet/optical polarization observations. Much stronger limits can be obtained by future multiwavelength observations in the gamma-ray energy band.

ROTATIONAL PROPERTIES OF MICRO-SLABS DRIVEN BY LINEARLY-POLARIZED LIGHT

2005 ◽  
Vol 14 (03) ◽  
pp. 375-382 ◽  
Author(s):  
CHIH-LANG LIN ◽  
IRÈNE WANG ◽  
MARC PIERRE ◽  
ISABELLE COLOMBIER ◽  
CHANTAL ANDRAUD ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Polarized Light ◽  
Polarization Plane ◽  
Light Polarization ◽  
Good Prediction ◽  
Polarization Anisotropy ◽  
Two Photon ◽  
Flat Slabs ◽  
Linearly Polarized ◽  
Optical Torque

We study the rotational motion of objects trapped in a focused laser beam (optical tweezers). Micrometer-sized flat slabs are fabricated using two-photon photopolymerization. These objects, trapped by linearly-polarized light, tend to align parallel to the polarization plane. This alignment effect is attributed to the polarization anisotropy resulting from the object shape and we present a simple electromagnetic approach to estimate the resulting optical torque. Micro-rotors of different sizes are studied experimentally. We characterize the behavior of micro-objects when the light polarization is rotated at constant speed. Our theoretical approach gives a good prediction of how the size of micro-objects affects their rotation efficiency.

A self-powered phosphorene photodetector with excellent spin-filtering and spin-valve effects

2019 ◽  
Vol 21 (14) ◽  
pp. 7613-7617 ◽  
Author(s):  
Yongzhi Luo ◽  
Yiqun Xie ◽  
Xiang Ye ◽  
Yin Wang
Keyword(s):  
Spin Valve ◽  
Polarized Light ◽  
Polarization Angle ◽  
Spin Polarized ◽  
Linearly Polarized ◽  
Self Powered ◽  
Spin Filtering

Spin-polarized photocurrent as a function of the polarization angle under illumination with linearly polarized light.

scholarly journals Manipulating Weyl quasiparticles by orbital-selective photoexcitation in WTe2

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Meng-Xue Guan ◽  
En Wang ◽  
Pei-Wei You ◽  
Jia-Tao Sun ◽  
Sheng Meng
Keyword(s):  
Quantum Dynamics ◽  
Near Infrared ◽  
Coherent Control ◽  
Polarized Light ◽  
Light Polarization ◽  
Effective Electron ◽  
Structural And Electronic Properties ◽  
Linearly Polarized ◽  
Shear Motion ◽  
New Perspective

AbstractOptical control of structural and electronic properties of Weyl semimetals allows development of switchable and dissipationless topological devices at the ultrafast scale. An unexpected orbital-selective photoexcitation in type-II Weyl material WTe2 is reported under linearly polarized light (LPL), inducing striking transitions among several topologically-distinct phases mediated by effective electron-phonon couplings. The symmetry features of atomic orbitals comprising the Weyl bands result in asymmetric electronic transitions near the Weyl points, and in turn a switchable interlayer shear motion with respect to linear light polarization, when a near-infrared laser pulse is applied. Consequently, not only annihilation of Weyl quasiparticle pairs, but also increasing separation of Weyl points can be achieved, complementing existing experimental observations. In this work, we provide a new perspective on manipulating the Weyl node singularity and coherent control of electron and lattice quantum dynamics simultaneously.

scholarly journals Polarization-Sensitive Light Sensors Based on a Bulk Perovskite MAPbBr3 Single Crystal

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1238
Author(s):  
Yuan Wang ◽  
Laipan Zhu ◽  
Cuifeng Du
Keyword(s):  
Single Crystal ◽  
Polarized Light ◽  
Light Polarization ◽  
Polarization Sensitivity ◽  
Anisotropy Ratio ◽  
Spin Orbit Coupling ◽  
Band Tail ◽  
Linearly Polarized ◽  
Halide Perovskites ◽  
Shed Light

Organic-inorganic halide perovskites have attracted much attention thanks to their excellent optoelectronic performances. Here, a bulk CH3NH3PbBr3 (MAPbBr3) single crystal (SC) was fabricated, whose temperature and light polarization dependence was investigated by measuring photoluminescence. The presence of obvious band tail states was unveiled when the applied temperature was reduced from room temperature to 78 K. Temperature dependence of the bandgap of the MAPbBr3 SC was found to be abnormal compared with those of traditional semiconductors due to the presence of instabilization of out-of-phase tail states. The MAPbBr3 SC revealed an anisotropy light absorption for linearly polarized light with an anisotropy ratio of 1.45, and a circular dichroism ratio of up to 9% was discovered due to the spin-orbit coupling in the band tail states, exhibiting great polarization sensitivity of the MAPbBr3 SC for the application of light sensors. These key findings shed light on the development of potential optoelectronic and spintronic applications based on large-scaled organic-inorganic perovskite SCs.

Electronic Structure of the Ultrathin Cs/Si(100)-(2 × 1) and Cs/Si(111)-(7 × 7) Interfaces in the Threshold Energy Region

1998 ◽  
Vol 05 (01) ◽  
pp. 91-95 ◽  
Author(s):  
G. V. Benemanskaya ◽  
D. V. Daineka ◽  
G. E. Frank-Kamenetskaya
Keyword(s):  
Fermi Level ◽  
Direct Evidence ◽  
Electronic Band Structure ◽  
Great Part ◽  
Polarized Light ◽  
Threshold Energy ◽  
Photoemission Spectroscopy ◽  
Electronic Band ◽  
Linearly Polarized ◽  
Light Excitation

The electronic band structure of the Cs/Si(100)-(2 × 1) and Cs/Si(111)-(7 × 7) interfaces has been studied near the Fermi level at submonolayer coverages. The technique of threshold photoemission spectroscopy with linearly polarized light excitation has been employed. Surface photoemission spectra reveal on Cs-induced band which can be either below the VBM or at the Fermi level, depending on the substrate. Parameters of the Cs band and the change in ionization energy and work function are obtained as a function of Cs coverage. Experimental data provide direct evidence that the Cs/Si(100)-(2 × 1) interface exhibits semiconducting charcter in a great part of the submonolayer range, in contrast to the metallic-like Cs/Si(111)-(7 × 7) interface.

Split and Merge of Left–Right Circular Polarized Light through Coupled Magnetic Resonators

2012 ◽  
Vol 67 (8-9) ◽  
pp. 491-497
Author(s):  
Jijun Wang ◽  
Jing Cao ◽  
Min Zhu ◽  
Zhipan Zhu ◽  
Yun-tuan Fang
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Transfer Matrix Method ◽  
Polarized Light ◽  
Light Polarization ◽  
Transmission Properties ◽  
Left Handed ◽  
Linearly Polarized ◽  
Split And Merge ◽  
Control Light

In order to obtain the means to control light polarization, we designed a structure of coupled magnetic resonators and studied its transmission properties by the 4x4 transfer matrix method. The incidence of linearly polarized light results in two transmission resonant peaks of left-handed circular polarization at shorter wavelengths and two transmission resonant peaks of right-handed circular polarization at longer wavelengths, respectively. Through adjusting the magnetizations, the inner left-handed circular polarization and right-handed circular polarization can be merged into one linear polarization, while the two outside resonant peaks keep their circular polarization. The polarized direction of the output linearly polarized light can be controlled by the polarized direction of incidence light. The incidence light with one polarization can output light with three kinds of polarizations through the designed structure.

scholarly journals THE ORIENTATION OF THE E-VECTOR OF LINEARLY POLARIZED LIGHT DOES NOT AFFECT THE BEHAVIOUR OF THE PIGEON COLUMBA LIVIA

1994 ◽  
Vol 191 (1) ◽  
pp. 107-123 ◽  
Author(s):  
M Coemans ◽  
J Hzn ◽  
J Nuboer
Keyword(s):  
Polarized Light ◽  
Columba Livia ◽  
Light Polarization ◽  
Homing Pigeon ◽  
Qualitative Studies ◽  
Polarization Sensitivity ◽  
Directional Response ◽  
Linearly Polarized ◽  
Vector Orientation ◽  
Indirect Reference

Orientation with reference to the time-compensated sun-azimuth compass has been established for the homing pigeon Columba livia. Previous qualitative studies claim that pigeons are sensitive to the orientation of a polarizer and it has been suggested that these animals are able to use sky-light polarization as an indirect reference to the sun's position when the latter is shielded from view. We report experiments which were undertaken to quantify the sensitivity of the homing pigeon to the orientation of linearly polarized light. The results of our initial experiments suggested that the animals responded to secondary cues. Further experiments were carried out to avoid such artefacts. Under circumstances where secondary cues were rigorously avoided, we were, however, not able to demonstrate any directional response that was caused by the E-vector orientation of the illumination. These results throw doubt on the suggested polarization-sensitivity of birds in general.

scholarly journals Changes in Optical Properties of Azopolymers in an Electric Field

2020 ◽  
Vol 65 (8) ◽  
pp. 686
Author(s):  
V. Smokal ◽  
O. Kharchenko ◽  
O. Krupka ◽  
S. Studzinsky ◽  
N. Davidenko ◽  
...  
Keyword(s):  
Electric Field ◽  
Polarized Light ◽  
Light Polarization ◽  
Optically Active ◽  
Reversible Change ◽  
Active Molecule ◽  
Electric Field Direction ◽  
Linearly Polarized ◽  
Dc Electric Field ◽  
Film Absorption

We report the preliminary results obtained for polymers incorporating the azobenzene side-group as an optically active molecule. The reversible change of the thin film absorption is observed when illuminating it with monochromatic linearly polarized light under the applied external DC field. The magnotude of a change depends on the angle between the light polarization and the DC electric field direction.

scholarly journals DEVELOPMENT OF "KERR EFFECT" DEVICES TO MEASURE URINE GLUCOSE LEVELS OF DIABETES MELITUS (DM) PATIENTS

2019 ◽  
Vol 11 (2) ◽  
pp. 38
Author(s):  
Nurun Nayiroh ◽  
Kusairi K
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Electric Fields ◽  
Kerr Effect ◽  
Parallel Plate ◽  
Polarized Light ◽  
Light Polarization ◽  
Polarization Angle ◽  
Urine Glucose ◽  
Glucose Levels

<p>The development of the "Kerr Effect" device has been carried out to measure urine glucose levels of Diabetes Mellitus (DM) patients by applying an external electric field of two parallel plate capacitors. The purpose of this research was to design and construct a new "Kerr Effect" device to measure urine glucose levels of DM patients, to determine the effects of external electric fields and glucose concentrations on light polarization. The measurement of the polarization changes was done by emitting polarized light through a glucose standard solution sample and urine samples of DM patients. In this measurement, the sample was irradiated with an external electric field (0 kV / m - 80 kV / m) of parallel plate capacitors, and the changes of light polarization in the sample were observed. The obtained data of the measurement have been collected and plotted as a graph. The results showed that as the electric field increased the changes in polarization have a tendency to increase. In addition, the amount of glucose concentration in the urine also affected the magnitude of the change in the rotational polarization angle of the light. Therefore, the changes in the rotational polarization angle increase linearly due to the influence of the external electric field and the concentration of glucose in the urine.</p>

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