Results 111 to 120 of about 8,681 (211)

Casimir force between designed materials: what is possible and what not

, 2005
We establish strict upper limits for the Casimir interaction between multilayered structures of arbitrary dielectric or diamagnetic materials. We discuss the appearance of different power laws due to frequency-dependent material constants.
Born M., C Henkel, Casimir H. B. G., Israelachvili J. N., K Joulain, Landau L. D., Lifshitz E. M., Lifshitz E. M., Ramakrishna S. A., Richmond P., Smith D. R., Tomaš M. S., Yeh P., Zhou F.   +13 more
core   +2 more sources

Instruments of RT-2 Experiment onboard CORONAS-PHOTON and their test and evaluation IV: Background Simulations using GEANT-4 Toolkit

, 2010
Hard X-ray detectors in space are prone to background signals due to the ubiquitous cosmic rays and cosmic diffuse background radiation that continuously bombards the satellites which carry the detectors.
Chakrabarti, Sandip K., Debnath, Dipak, Kotoch, Tilak B., Mandal, Samir, Nandi, Anuj, Rao, A. R., Sarkar, Ritabrata   +6 more
core   +1 more source

Novel Focusing Performances of High-Numerical-Aperture Micro-Fresnel Zone Plates with Selective Occlusion

Photonics
In this study, novel focusing performances of high-numerical-aperture (NA) micro-Fresnel zone plates (FZPs) with selective occlusion are identified and investigated through numerical calculations based on vectorial angular spectrum (VAS) theory, and ...
Qiang Liu, Yunpeng Wu, Yuanhao Deng, Junli Wang, Wenshuai Liu, Xiaomin Yao   +5 more
doaj   +1 more source

Exploiting atomic layer deposition for fabricating sub-10 nm X-ray lenses

, 2018
Moving towards significantly smaller nanostructures, direct structuring techniques such as electron beam lithography approach fundamental limitations in feature size and aspect ratios.
Belkhou, Rachid, Bosgra, Jeroen, David, Christian, Döring, Florian, Fink, Rainer H., Guzenko, Vitaliy A., Kirk, Eugenie, Koch, Frieder, Meyer, Markus, Ornelas, Joshua L., Raabe, Jörg, Rösner, Benedikt, Stanescu, Stefan, Swaraj, Sufal, Watts, Benjamin   +14 more
core   +1 more source

Aberration-free ultra-thin flat lenses and axicons at telecom wavelengths based on plasmonic metasurfaces

, 2012
The concept of optical phase discontinuities is applied to the design and demonstration of aberration-free planar lenses and axicons, comprising a phased array of ultrathin subwavelength spaced optical antennas.
Aieta F., Artl J., Blanchard R., Bobb D. A., Cai W., Encinar J. A., Fattal D., Federico Capasso, Francesco Aieta, Genevet P., Hecht E., Huang F. M., Huang F. M., Jarutis V., Kats M. A., Kinglsake R., Koppens F. H.L., Liu Z., Lu F., Manek I., McGrath D. T., McLeod J. H., McLeod J. H., Mikhail A. Kats, Nanfang Yu, Ni X., Padilla P., Patrice Genevet, Pendry J. B., Pozar D. M., Pozar D. M., Ren. Q., Rogers E. T. F., Romain Blanchard, Ryan C. G. M., Smith D. R., Tetienne J. P., Verslegers L, West P. R., Yu N., Zeno Gaburro   +40 more
core   +1 more source

Micro-optic lens for data storage [PDF]

A new type of microlens for data storage applications that has improved off-axis performance is described. The lens consists of a micro Fresnel pattern on a curved substrate. The radius of the substrate is equal to the focal length of the lens.
Erwin, J. Kevin, Froehlich, F. F., Milster, T. D., Trusty, R. M., Wang, M. S.   +4 more
core   +1 more source

Measurement and compensation of misalignment in double-sided hard X-ray Fresnel zone plates. [PDF]

J Synchrotron Radiat, 2020
Yurgens V, Koch F, Scheel M, Weitkamp T, David C.   +4 more
europepmc   +1 more source

Author Correction: Nanofocusing of hard X-ray free electron laser pulses using diamond based Fresnel zone plates. [PDF]

Sci Rep, 2020
David C, Gorelick S, Rutishauser S, Krzywinski J, Vila-Comamala J, Guzenko VA, Bunk O, Färm E, Ritala M, Cammarata M, Fritz DM, Barrett R, Samoylova L, Grünert J, Sinn H.   +14 more
europepmc   +1 more source

Reference Phase of Fresnel Zone Plates

, 2003
The standard zone plate assumes that the shortest ray connecting a radiation source and a detection point has a phase of 0 deg thereby defining a reference phase. Here we examine the experimental consequences of varying this reference phase from 0 deg to 360 deg. It is concluded that reference phase is an intrinsic and useful property of zone plates.
openaire   +2 more sources

Producing focused extreme ultraviolet vortex with Fermat-spiral photon sieves

PhotoniX
Extreme ultraviolet (EUV) light is difficult to focus due to strong absorption of most materials. Photon sieves (PS), rather than Fresnel zone plates (FZP), can focus EUV to smaller spot and suppress the higher orders of secondary maxima by several ...
Junyong Zhang, Huaiyu Cui, Yuanyuan Liu, Xiuping Zhang, You Li, Dongdi Zhao, Yongpeng Zhao, Qiwen Zhan   +7 more
doaj   +1 more source