Results 61 to 70 of about 1,347 (193)

Birefringent Fresnel zone plates in silica fabricated by femtosecond laser machining [PDF]

, 2002
We demonstrate maskless, single-step fabrication of strongly birefringent Fresnel zone plates by focusing of femtosecond laser pulses deep within silica substrates.
Baumberg, Jeremy J., Kazansky, Peter G., Klappauf, Bruce G., Mills, John D., Bricchi, Erica   +4 more
core   +1 more source

Extraordinary spin to orbital angular momentum conversion on guided zone plates

Scientific Reports, 2021
Focusing systems with high numerical aperture can be used to convert spin angular momentum into orbital angular momentum with efficiencies of 50%, while for low numerical apertures this conversion vanishes.
Pablo Acebal, Luis Carretero, Salvador Blaya   +2 more
doaj   +1 more source

Autonomous X‐Ray Fluorescence Mapping for Nanoscale Chemical Speciation of Fine Particulate Matter

Advanced Intelligent Discovery, EarlyView.
We present X‐AutoMap, an autonomous X‐ray fluorescence mapping framework that integrates real‐time analysis with rule‐based computer vision to selectively target chemically relevant regions. By avoiding background‐dominated areas, the method reduces acquisition time by fourfold while enabling accurate particle‐level speciation.
Carlos Deleon, Dmitri Gavrilov, Peggy O’Day, Ajith Pattammattel   +3 more
wiley   +1 more source

Fabrication of high-aspect-ratio Fresnel zone plates by e-beam lithography and electroplating [PDF]

, 2019
The fabrication of gold Fresnel zone plates, by a combination of e-beam lithography and electrodeposition, with a 30 nm outermost zone width and a 450 nm-thick structure is described.
Wang, C. L., Yang, C. C., Margaritondo, G., Je, J. H., Lin, H. M., Wu, S. R., Yin, G. C., Liu, C. J., Wang, J. Y., Chen, Y. T., Chiu, C. W., Hwu, Y., Lo, T. N., Jeng, S. T., Chen, C. H., Shiue, J.   +15 more
core   +5 more sources

Double-Illumination All-Optical Nanoalignment for Stacking X-Ray Fresnel Zone Plates

Advanced Devices & Instrumentation
Fresnel zone plate (FZP) stacking is an approach to enhance diffraction efficiency in x-ray focusing and imaging by physically aligning 2 or more FZPs to increase the effective thickness and optical efficiency.
Siqi Wang, Cheng Jiang, Robert Peters, Mirwais Aktary, Jinyang Liang   +4 more
doaj   +1 more source

The ORCA‐TWIN qCMOS Experiment I. Science Case and Commissioning at Calar Alto Observatory

Astronomische Nachrichten, EarlyView.
ABSTRACT We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. The experiment involves direct imaging with novel qCMOS image sensor technology that combines fast readout with sub‐electron readout noise.
Martin M. Roth, Paško Roje, Stella Vješnica, Stefan Cikota, Alex J. Brown, Mike Kretlow, Marco Azzaro, Santiago Reinhart, Jesús Aceituno, Harry Dawson, Carsten Denker, Torsten Enßlin, Stephan Geier, Thomas Granzer, Thomas Kupfer, Gianluca Li Causi, Samaya Nissanke, José Luis Ortiz, Fernando Pedichini, Katja Poppenhäger, Axel Schwope   +20 more
wiley   +1 more source

Pancharatnam–Berry Phase Driven by Electrical Restructuring of Liquid Crystal Polarization Grating Period

Laser &Photonics Reviews, EarlyView.
Electrically controlled liquid‐crystal twist diffraction element based on the Pancharatnam–Berry phase enables switchable structural periodicity and simultaneous generation of orthogonal circularly polarized coherent waves for multifunctional planar photonic devices.
Elena Melnikova, Katsiaryna Pantsialeyeva, Alexei Tolstik, Veranika Stanevich, Daminika Dashkevich, Anatoli Murauski, Alexander Muravsky, Alina Karabchevsky   +7 more
wiley   +1 more source

Ultra Short Pulse Laser Welding of Glass to Metal in the Low Fluence Regime

Laser &Photonics Reviews, EarlyView.
Ultrashortpulse laser welding enables precise joining of glass and metal with minimal thermal damage. We introduce the TwoThresholds Criteria to identify suitable laser parameters by combining the nonlinearabsorption threshold in glass with the metalmodification fluence threshold.
Lukas Günther, Anne Friedrich, Jens Ulrich Thomas, Andreas Koglbauer, Dominique de Ligny   +4 more
wiley   +1 more source

Focusing Microwaves in the Fresnel Zone With a Cavity-Backed Holographic Metasurface

IEEE Access, 2018
We present the design and experimental demonstration of a cavity-backed, holographic metasurface capable of focusing microwaves in the Fresnel zone. The circular cavity consists of two stacked plates: microwaves are injected into the bottom plate via a ...
Vinay R. Gowda, Mohammadreza F. Imani, Timothy Sleasman, Okan Yurduseven, David R. Smith   +4 more
doaj   +1 more source

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