Results 71 to 80 of about 8,681 (211)

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

Resolutions in Imaging with Fresnel Zone Plate

RADIOISOTOPES, 1978
A coarse Fresnel zone plate (FZP) may be used as a large-area coded aperture for imaging incoherent sources. The longitudinal and lateral spatial resolutions are discussed on the basis of experiment using an FZP having 18 or 19 zones as an aperture. In this paper, it is then shown that the lateral spatial resolution is about 5 mm and the longitudinal ...
G, Itaya, K, Kojima
openaire   +3 more sources

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

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

Imaging and Linking Spatial Magnetic Nanoparticle Distribution to Microbead Torques Using Soft X‐Ray Laminography

Advanced Physics Research, EarlyView.
Nanoscale 3D imaging of superparamagnetic microbeads via soft X‐ray laminography reveals the structural origin of the observed torques in cell movement experiments. These microbeads are found to have an uneven distribution of magnetic magnetite nanoparticles.
Findan Block, Finn Klingbeil, Dennis Seidler, Christine Arndt, Sandra Sindt, Katharina Witte, Benjamin Watts, Jörg Raabe, Christine Selhuber‐Unkel, Jeffrey McCord   +9 more
wiley   +1 more source

Casimir Force on Real Materials - the Slab and Cavity Geometry [PDF]

, 2006
We analyse the potential of the geometry of a slab in a planar cavity for the purpose of Casimir force experiments. The force and its dependence on temperature, material properties and finite slab thickness are investigated both analytically and ...
, , Antoci S, Bentsen V S, Brevik I, Brevik I, Brevik I, Brevik I Aarseth J B Høye J S Milton K A Milton K A, Buenzli P R, Casimir H B G, Chaudhury M K, Dzyaloshinskii I E, Ellingsen S A, Ellingsen S A, Høye J S, Iver Brevik, Lai H M, Lambrecht A, Lamoreaux S K, Langbein D, Lifshitz E M, Lifshitz E M, Lifshitz E M, Milton K A, Milton K A, Mostepanenko V M, Møller C, Nesterenko V V, Parsegian V A, Pirozhenko I, Pitaevskii L P, Raabe C, Raabe C Welsch D-G, Simen A Ellingsen, Zhang J Z   +34 more
core   +2 more sources

Exploring Low‐Concentrating Photovoltaic Systems and Solar Cell Solutions for Nigeria's Renewable Energy Future

Energy Science &Engineering, EarlyView.
This study explores the potential of solar PV and concentrating PV (CPV) technologies as sustainable energy solutions for Nigeria, highlighting their suitability in transitioning away from fossil fuels. By harnessing abundant solar resources, these technologies offer efficient, clean, and locally adaptable alternatives, supporting energy security ...
Sani Mohammed Lawal, Nazila Fough, Firdaus Muhammad‐Sukki, Mohd Khairul Amri Kamarudin, Nazmi Sellami   +4 more
wiley   +1 more source

Fractal Generalized Zone Plates [PDF]

, 2008
The construction of fractal generalized zone plates (FraGZPs) from a set of periodic diffractive optical elements with circular symmetry is proposed. This allows us to increase the number of foci of a conventional fractal zone plate (FraZP), keeping the ...
Bottema, Cavalieri, Dai, Davis, Davis, Dong, Furlan, Gladys Mínguez-Vega, Jesús Lancis, Juan A. Monsoriu, Mendoza-Yero, Mendoza-Yero, Mercedes Fernández-Alonso, Monsoriu, Monsoriu, Ni, Omel Mendoza-Yero, Saavedra, Sakdinawat, Shi, Tao, Vicent Climent, Waldman, Wang, Zheng   +24 more
core   +4 more sources

Optical Skyrmions with Tunable or Reconfigurable Topology Using Spin‐Decoupled Metaoptics

Laser &Photonics Reviews, EarlyView.
The work introduces advanced optical elements capable of generating and dynamically reconfiguring complex light patterns known as optical skyrmions. By precisely shaping light polarization at the nanoscale, a single engineered metasurface can generate and manipulate robust and tunable polarization textures in an efficient and scalable way.
Andrea Vogliardi, Daniele Bonaldo, Simone Dal Zilio, Vittorio Apolloni, Filippo Romanato, Gianluca Ruffato   +5 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