scholarly journals Investigation of the polarization state of dual APPLE-II undulators

2016 ◽  
Vol 23 (1) ◽  
pp. 176-181 ◽  
Author(s):  
Matthew Hand ◽  
Hongchang Wang ◽  
Sarnjeet S. Dhesi ◽  
Kawal Sawhney
Keyword(s):  
Polarization State ◽  
Polarized Light ◽  
Photon Flux ◽  
Beam Polarization ◽  
Polarization Angle ◽  
Circularly Polarized Light ◽  
X Ray ◽  
Processing Procedure ◽  
Polarization Characteristics ◽  
Data Acquisition And Processing

The use of an APPLE II undulator is extremely important for providing a high-brilliance X-ray beam with the capability to switch between various photon beam polarization states. A high-precision soft X-ray polarimeter has been used to systematically investigate the polarization characteristics of the two helical APPLE II undulators installed on beamline I06 at Diamond Light Source. A simple data acquisition and processing procedure has been developed to determine the Stokes polarization parameters for light polarized at arbitrary linear angles emitted from a single undulator, and for circularly polarized light emitted from both undulators in conjunction with a single-period undulator phasing unit. The purity of linear polarization is found to deteriorate as the polarization angle moves away from the horizontal and vertical modes. Importantly, a negative correlation between the degree of circular polarization and the photon flux has been found when the phasing unit is used.

Development and performance of a versatile soft X-ray polarimeter

2010 ◽  
Vol 1 (SRMS-7) ◽  
Author(s):  
H. Wang ◽  
U. H. Wagner ◽  
S. S. Dhesi ◽  
K. J. S. Sawhney ◽  
F. Maccherozzi ◽  
...  
Keyword(s):  
Light Source ◽  
Rare Earths ◽  
Polarization State ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
X Ray ◽  
Arbitrary Polarization ◽  
And Performance ◽  
Transmission Phase

With modern undulators generating light of an arbitrary polarization state, experiments exploiting this feature in the soft X-ray region are becoming increasingly widespread. Circularly polarized light in the soft X-ray region is of particular interest to investigate of magnetic metals such as Fe, Co and Ni, and the rare earths. A versatile multilayer polarimeter has been designed and developed to characterize the polarization state of the soft X-ray beam. A W/B4C multilayer transmission phase retarder and reflection analyser has been used for polarimetry measurements on the beamline (I06) at Diamond Light Source. The design details of the polarimeter and preliminary polarimetry results are presented.

Linear and Circular Dichroism in Angle Resolved Fe 3p Photoemission

1994 ◽  
Vol 375 ◽  
Author(s):  
E. Tamura ◽  
G. D. Waddill ◽  
J. G. Tobin ◽  
P. A. Sterne
Keyword(s):  
Polarized Light ◽  
Exchange Splitting ◽  
Orbit Splitting ◽  
Green Function Method ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
X Ray ◽  
Spin Orbit Splitting ◽  
Magnetic Dichroism ◽  
Spin Polarized

AbstractUsing a recently developed spin-polarized, fully relativistic, multiple scattering approach based on the layer KKR Green function method, we have reproduced the Fe 3p angle-resolved soft x-ray photoemission spectra and analyzed the associated large magnetic dichroism effects for excitation with both linearly and circularly polarized light. Comparison between theory and experiment yields a spin-orbit splitting of 1.0 – 1.2 eV and an exchange splitting of 0.9 – 1.0 eV for Fe 3p. These values are 50 – 100 % larger than those hitherto obtained experimentally.

scholarly journals Circularly Polarized Light Detection by Chiral Photonic Cellulose Nanocrystal with ZnO Photoconductive Layer in Ultraviolet Region

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3098
Author(s):  
Boyu Zhang ◽  
Sixiang Zhao ◽  
Yingying Yu ◽  
Ming Li ◽  
Liancheng Zhao ◽  
...  
Keyword(s):  
Self Assembly ◽  
Polarization State ◽  
Polarized Light ◽  
Cellulose Nanocrystal ◽  
Ultraviolet Region ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Left Handed ◽  
Chiral Nematic ◽  
Wide Range

Circularly polarized light (CPL) detection and polarization state recognition are required for a wide range of applications. Conventional polarization detection with optical components causes difficulties for miniaturization and integration. An effective design strategy is proposed for direct CPL detection with chiral material. Here, we realized direct CPL detection based on the combination of chiral photonic cellulose nanocrystal (CNC) and ultraviolet-sensitive ZnO photoconductive material. The CNC layer deposited by evaporation-induced self-assembly established the left-handed chiral nematic structure with a photonic bandgap (PBG) to recognize left-handed CPL (LCPL) and right-handed CPL (RCPL) at specific wavelengths. The PBG of CNC layer has been modulated by the adjustment of chiral nematic pitch to match the semiconductor bandgap of ZnO film in ultraviolet region. The photocurrents under RCPL and LCPL are 2.23 × 10−6 A and 1.77 × 10−6 A respectively and the anisotropy factor Δgpc of 0.23 is acquired for the CPL detection based on the chiral photonic CNC. This design provides a new approach to the detection of CPL polarization state with competitive performance.

Laser Induced Periodic Surface Structure

1982 ◽  
Vol 13 ◽  
Author(s):  
H.M. Van Driel ◽  
Jeff F. Young ◽  
J.E. Sipe
Keyword(s):  
Surface Structure ◽  
Polarized Light ◽  
Beam Polarization ◽  
Time Resolved ◽  
Periodic Surface ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Surface Modes ◽  
Periodic Surface Structure ◽  
Damage Structure

ABSTRACTLaser induced periodic surface structure can be understood as a universal phenomenon which occurs when high intensity pulses are absorbed near the surface of solids or liquids. The phenomenon occurs on metals, semiconductors and insulators because of the interference between the incident pulse and an induced “radiation remnant”. This scattered field may be enhanced by the existence of true surface modes such as surface plasmons or phonon-polaritons but this is not essential. The universality characteristics include beam polarization, since we show that circularly polarized light can induce surface ripples, with the damage structure showing a dependence on the sense of rotation. We also present time resolved results of the formation of the ripples to illustrate the essential dynamical processes that occur.

Three-dimensional optical transforms

1961 ◽  
Vol 264 (1318) ◽  
pp. 339-354 ◽  
Keyword(s):  
Fourier Transforms ◽  
Three Dimensional ◽  
Polarized Light ◽  
Continuous Phase ◽  
Optical Diffraction ◽  
X Ray Diffraction ◽  
Circularly Polarized Light ◽  
X Ray ◽  
Half Wave ◽  
Diffraction Patterns

In recent years optical diffraction patterns have been used to assist in the solution of certain X-ray diffraction problems. The most useful technique—which is based partly on the properties of Fourier transforms and partly on optical experiments—is usually known as the optical-transform technique. It has, however, so far been confined to problems involving the projection of crystal structures on to a plane. The present work is aimed at extending the application to full three-dimensional structures. It is shown that this is most simply achieved by controlling the relative phases of beams of light; a method of phase control using circularly polarized light and half-wave plates of mica is described. The theory of the method, experimental details, and the demonstration of its validity are given. In order to gain experience in the use of three-dimensional optical transforms for solving X-ray diffraction problems a known structure has been examined, and the results of this work are included. Although this work has been primarily concerned with applications to X-ray diffraction, it is thought that the method of continuous phase changing, which is simple and linear, may find uses in other fields.

Effect of residual linear orientation on the optical properties of cholesteric films

1988 ◽  
Vol 66 (9) ◽  
pp. 2229-2233 ◽  
Author(s):  
Anna M. Ritcey ◽  
Gérard Charlet ◽  
Derek G. Gray
Keyword(s):  
Liquid Crystalline ◽  
Potential Problem ◽  
Polarization State ◽  
Polarized Light ◽  
Hydroxypropyl Cellulose ◽  
Reflection Band ◽  
Selective Reflection ◽  
Circularly Polarized Light ◽  
Oriented Film ◽  
Simple Consideration

The apparent circular dichroism arising from the selective reflection of circularly polarized light by cholesteric films of (hydroxypropyl)cellulose is extremely sensitive to residual linear orientation. The introduction of a uniaxially oriented film in the spectropolarimeter beam in front of a liquid crystalline sample may change both the intensity and the sign of the observed mesophase reflection band. The results can be understood by a simple consideration of the way in which the polarization state of light is altered as it traverses the birefringent film. These observations emphasize a potential problem in the use of circular reflectivity as a method to characterize the reflection properties of polymeric cholesteric liquid crystals. The presence of linear orientation in such samples can give rise to artifacts.

scholarly journals Multifunctional Metasurface Lens With Tunable Focus Based on Phase Transition Material

2021 ◽  
Vol 9 ◽  
Author(s):  
Yongkang Song ◽  
Weici Liu ◽  
Xiaolei Wang ◽  
Faqiang Wang ◽  
Zhongchao Wei ◽  
...  
Keyword(s):  
Phase Transition ◽  
Light Field ◽  
Focal Point ◽  
Incident Light ◽  
Polarization State ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Multiple Focus ◽  
Linearly Polarized

Metasurfaces have powerful light field manipulation capabilities, which have been extensively studied in the past few years and have developed rapidly in various fields. At present, the focus of metasurface research has shifted to the tunable functionality. In this paper, a temperature-controllable multifunctional metasurface lens based on phase transition material is designed. First of all, by controlling the temperature of the desired working area and the polarization of the incident light, switching among multiple focus, single focus, and no focus at any position can be achieved, and the intensity and helicity of the output light can be adjusted. In addition, a polarization-sensitive intensity-tunable metalens based on the P-B phase principle is designed, when the incident light is linearly polarized light, left-handed circularly polarized light, or right-handed circularly polarized light, it has the same focal point but with different light field intensities. Therefore, the focused intensity can be tunable by the polarization state of the incident light.

scholarly journals The GALAXIES inelastic hard X-ray scattering end-station at Synchrotron SOLEIL

2019 ◽  
Vol 26 (1) ◽  
pp. 263-271 ◽  
Author(s):  
J. M. Ablett ◽  
D. Prieur ◽  
D. Céolin ◽  
B. Lassalle-Kaiser ◽  
B. Lebert ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Polarized Light ◽  
Research Direction ◽  
High Energy ◽  
High Energy Resolution ◽  
X Rays ◽  
Circularly Polarized Light ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

GALAXIES is an in-vacuum undulator hard X-ray micro-focused beamline dedicated to the study of the electronic structure of materials with high energy resolution using both photoelectron spectroscopy and inelastic X-ray scattering and under both non-resonant (NR-IXS) and resonant (RIXS) conditions. Due to the penetrating power of hard X-rays and the `photon-in/photon-out' technique, the sample environment is not a limitation. Materials under extreme conditions, for example in diamond anvil cells or catalysis chambers, thus constitute a major research direction. Here, the design and performance of the inelastic X-ray scattering end-station that operates in the energy range from ∼4 keV up to 12 keV is reported, and its capabilities are highlighted using a selection of data taken from recently performed experiments. The ability to scan `on the fly' the incident and scattered/emitted X-ray energies, and the sample position enables fast data collection and high experimental throughput. A diamond X-ray transmission phase retarder, which can be used to generate circularly polarized light, will also be discussed in the light of the recent RIXS–MCD approach.

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