Results 121 to 130 of about 4,697 (265)

Fabrication and tolerance reduction of a Si-based pickup module for optical storage

, 2011
We develop a miniaturized optical signal pickup module, with a working wavelength of 650 nm, and an image numerical aperture (NA) of 0.6, comprised of several SiNX optical phase elements on stacked Si substrates, for use in optical storage systems.
Lee, Chien-chien; Wang, Chin-ming; Huang, S.K.; Chang, J. Y.;Chi, Gou-chung; Hsu, S. C.; Liu, C. Y.
core   +1 more source

Emergent Chaos‐Like Dynamics of Spin–Orbit‐Torque‐Driven Magnetic Transitions

Small, EarlyView.
By combining anisotropy‐engineered nanometer‐scale nucleation sites with time‐resolved x‐ray holography and micromagnetic modeling, magnetization dynamics are directly imaged, revealing chaos‐like fluctuations and skyrmion shedding and highlighting the intrinsic complexity of spin‐orbit torque driven systems.
L.‐M. Kern, K. Litzius, V. Deinhart, M. Schneider, C. Klose, K. Gerlinger, R. Battistelli, D. Metternich, D. Engel, C. M. Günther, M.‐J. Huang, K. Höflich, F. Büttner, S. Eisebitt, B. Pfau   +14 more
wiley   +1 more source

High‐Efficiency Generation of Vectorial Terahertz Beams via Surface‐Wave‐Excited Dielectric Metasurfaces

Small, EarlyView.
ABSTRACT Generating pre‐designed vectorial beams via on‐chip devices can yield many fascinating applications, but traditional diffraction‐based devices are bulky and inefficient. While plasmonic metasurfaces exhibit ultra‐compact sizes and deep‐subwavelength resolutions, their working efficiencies are limited by metallic losses.
Yu He, Yuanxi Liu, Yao Yao, Qingnan Cai, Dumeng Zhang, Xiangyu Jin, Shulin Sun, Zhuo Wang, Lei Zhou   +8 more
wiley   +1 more source

Holographic optical elements: Fabrication and testing

, 1974
The basic properties and use of holographic optical elements were investigated to design and construct wide-angle, Fourier-transform holographic optical systems for use in a Bragg-effect optical memory. The performance characteristics are described along
Zech, R. G., Shareck, M., Ralston, L. M.
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Holographic optical elements for Bragg image processing

, 2005
In this work we analyse the very specific properties offered by volume holography when applied to image processing with no Fourier plane. Bragg diffraction, exhibited by holographic optical elements (HOEs), modifies the impulse response of an imaging ...
Sergi Gallego, Pascual Villalobos, Inmaculada, Cristian Neipp, Pascual, Inmaculada, Gallego Rico, Sergi, Márquez Ruiz, Andrés, Ortuño, Manuel, Gallego, Sergi, Beléndez, Augusto, Beléndez Vázquez, Augusto, Neipp, Cristian, A. Belendez, Ortuño Sánchez, Manuel, M. Ortuno, I. Pascual, A. Marquez, Márquez, Andrés, Neipp López, Cristian   +17 more
core   +1 more source

Study on Impurity Particle Detection in Transformer Oil Based on Microflow Imaging Method

High Voltage, EarlyView.
ABSTRACT The concentration of particles in transformer oil has a significant influence on its electrical performance, making oil cleanliness a critical parameter in the operation and maintenance of power transformers. However, the light obstruction (LO) method recommended by current standards has inherent limitations, including low sensitivity to ...
Chen Chen, Lijun Yang, Wu Zhao, Zhengyu Chen, Xinxi Yu, Yong Li, Ruijin Liao   +6 more
wiley   +1 more source

Full‐field X‐ray fluorescence imaging using a Fresnel zone plate as a coded aperture: optimized reconstruction algorithm and first trial of hyperspectral XANES mapping

Journal of Synchrotron Radiation, EarlyView.
The full‐field X‐ray fluorescence imaging method, where a Fresnel zone plate is employed as a coded aperture, was tested for the first time at a beamline, and its corresponding reconstruction code was optimized. It was also employed to perform, also for the first time using full‐field and fluorescence modes, hyperspectral XANES mapping.This study ...
Gautier Landrot, Arkadiusz Dawiec, Björn Eckert, Petra Majewski, Michael Brunner, Andrew Fram, Martin Huth, Guillaume Alizon, Claude Menneglier, Enrico Piasentier, Karine Chaouchi, Stéphanie Blanchandin, Pascal Mercere, Martin Chauvin, Emiliano Fonda   +14 more
wiley   +1 more source

Diffractive wavefront correction for Fe L‐edge spectroscopy on the meV scale

Journal of Synchrotron Radiation, EarlyView.
We propose an aberration‐corrected, wavelength‐dispersive instrument for soft X‐ray spectroscopy at an energy‐resolving power of (5–6) × 104, designed for, for example, resonant inelastic X‐ray scattering at synchrotron beamlines or X‐ray free‐electron lasers.We propose a wavelength‐dispersive instrument for high‐resolution soft X‐ray spectroscopy at ...
Christoph Braig, Andrey Sokolov, Frank Siewert, Christian Seifert   +3 more
wiley   +1 more source

Holographic Photopolymerizable Glass: Enhancing Exposure Sensitivity by Tailoring Photoinitiating Systems Based on BODIPY Dyes

Advanced Photonics Research
The photoinitiating system (PIS) is a key component of holographic materials which needs to be carefully selected and optimized to achieve efficient photopolymerization and, as a result, highly efficient holographic structures.
Tatsiana Mikulchyk, Aimee Sheehan, Metodej Dvoracek, Izabela Naydenova, Mikhail A. Filatov   +4 more
doaj   +1 more source

Diffractional analysis of holographic optical elements recorded on cylindrical substrates

, 1993
The image quality of holographic optical elements recorded with spherical wavefronts on cylindrical substrates is analyzed using diffraction theory. The computation of point spread functions for aberration-free and angular misadjustment cases is done by ...
Carretero López, Luis, Beléndez, Augusto, Beléndez Vázquez, Augusto, Fimia Gil, Antonio, Fuentes Rosillo, Rosa   +4 more
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