Results 51 to 60 of about 1,516 (173)

Wavelength and Full‐Polarization Encrypted Orbital Angular Momentum Meta‐Holography

Laser &Photonics Reviews, EarlyView.
By multiplexing three independent degrees of freedom of light, a single‐layer geometric‐phase metasurface encrypts 24 distinct holographic images across 3 wavelengths, 12 pairs of orthogonal polarizations, and 4 OAM channels, taking advantage of axial chromatic dispersion to reconstruct the color images at the same plane. ABSTRACT Multiplexing multiple
Yue Han, Mingna Xun, Yuqing He, Sheng Ye, Weiping Wan, Yan Li   +5 more
wiley   +1 more source

Invariance Properties and Measurement of Correlation Between Two Propagating or Evanescent Waves

Laser &Photonics Reviews, EarlyView.
This work analyses the strength of correlation between two propagating or evanescent plane waves generally expressed in different frames. Interferometric and nanoscattering‐based methods, respectively, are demonstrated for their measurement. The results show that the applied measure of correlation remains invariant under unitary polarization ...
Zhen Dong, Kimmo Saastamoinen, Andreas Norrman, Yahong Chen, Ari T. Friberg, Tero Setälä   +5 more
wiley   +1 more source

Enhanced Transmit Efficiency of a Loop Array Combined With Out‐of‐Phase Passive Dipoles for Thoracic Spinal Cord MRI at 7T

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose The design of radiofrequency (RF) coils tailored for the target anatomy is necessary to overcome the transmit field homogeneity and penetration issues at Ultra‐High‐Field (UHF). For the spinal cord, the optimal design has not yet been determined. This work intends to demonstrate the added value of a pair of passive dipoles placed under
Hugo Amat, Marc Dubois, Aurelien Destruel, Sajad Hosseinnezhadian, Djamel Berrahou, Charles Betemps, Amira Trabelsi, David Bendahan, Stefan Enoch, Virginie Callot, Redha Abdeddaim   +10 more
wiley   +1 more source

Monitoring shallow geothermal aquifers with active‐source distributed acoustic sensing: A prognostic feasibility study on the University of Leeds Geothermal Campus

Near Surface Geophysics, EarlyView.
Abstract The United Kingdom's shallow aquifers offer significant but underdeveloped geothermal energy resource. Seismic methods can help address this by improving the understanding of aquifer heterogeneity and potentially allowing long‐term monitoring of thermal plumes.
Adam D. Booth, Roger A. Clark, Andy Nowacki, Ravi Myanger, Joseph Kelly, Sjoerd de Ridder, Arka Dyuti Sarkar, Fleur Loveridge, Richard Collier, Emma Bramham, David Healy   +10 more
wiley   +1 more source

Supersampled Scanning Transmission X‐Ray Microscopy for High‐Resolution Vibration‐Independent Time‐Resolved Imaging

Small, EarlyView.
ABSTRACT Scanning transmission x‐ray microscopy (STXM) is a nanoscale imaging technique that can utilize several powerful contrast mechanisms for the quantitative mapping of chemical and physical materials properties. Spatial resolutions down to 7 nm at the soft x‐ray energy range have been demonstrated.
Simone Finizio, Benjamin Watts, Benedikt Rösner, Tim A. Butcher, Sebastian Wintz, Markus Weigand, Jörg Raabe   +6 more
wiley   +1 more source

Interlayer‐Catalyst Method for Metal‐Assisted Chemical Etching of Ultra‐High Aspect Ratio Silicon Nanostructures

Small Methods, EarlyView.
An advanced patterning method is presented for metal‐assisted chemical etching. The interlayer replaces the resist and enables catalyst deposition on a clean interface. The prepared samples show improved performance with a more reproducible etching profile, higher aspect ratio, and increased consistency over a larger area.
Bryan Peter Jost Benz, Marco Stampanoni, Lucia Romano   +2 more
wiley   +1 more source

A beam‐direction cross‐vessel metrology method and error analysis for the ptychography setup at HEPS ID09

Journal of Synchrotron Radiation, EarlyView.
A beamline‐direction cross‐vessel metrology method and error analysis for ptychography setup at HEPS ID09 is proposed and implemented. A 12.3 nm reconstruction resolution of ptychography demonstrates the validity of metrology.A metrology method dedicated to position monitoring and correction for the ptychography setup at the High Energy Photon Source ...
Ruiying Liao, Zina Ou, Haihan Yu, Xuan Wang, Jie Dong, Aiyu Zhou, Wenkai Kang, Liang Zhou, Shanzhi Tang, Ming Li, Weifan Sheng   +10 more
wiley   +1 more source

Transmission zone plates as analyzers for efficient parallel 2D RIXS-mapping

Scientific Reports, 2017
We have implemented and successfully tested an off-axis transmission Fresnel zone plate as spectral analyzer for resonant inelastic X-ray scattering (RIXS).
Felix Marschall, Zhong Yin, Jens Rehanek, Martin Beye, Florian Döring, Katharina Kubiček, Dirk Raiser, Sreevidya Thekku Veedu, Jens Buck, André Rothkirch, Benedikt Rösner, Vitaliy A. Guzenko, Jens Viefhaus, Christian David, Simone Techert   +14 more
doaj   +1 more source

Implementation and Verification of Fresnel Zone Plate Patterns Designed by Optimization of Surface Phase [PDF]

한국정밀공학회지
In this study, we present a numerical simulation approach for designing Fresnel zone plate (FZP) patterns. By optimizing surface phase parameters using desired merit functions in ray-tracing software, the obtained surface phase was converted into an FZP ...
Huy Vu, Joohyung Lee
doaj   +1 more source

A real‐time correction method for sample drift in STXM based on Fourier transform image registration

Journal of Synchrotron Radiation, EarlyView.
This study proposes an online drift‐correction method for scanning transmission X‐ray microscopy that integrates Fourier‐transform image registration with laser‐interferometer feedback, suppressing sample drift in a 100‐image stack scan from over 1 mm to below 120 nm and thereby eliminating redundant scan area while markedly enhancing experimental ...
Yuchen Jiao, Zijian Xu, Tianxiao Sun, Yufei Zhang, Yao Luo, Zhi Guo, Yong Wang, Xiangjun Zhen, Jian He, Renzhong Tai, Xiangzhi Zhang   +10 more
wiley   +1 more source