Results 81 to 90 of about 775,307 (358)

Gravitational lensing [PDF]

Classical and Quantum Gravity, 2010
Invited review article to appear in Classical and Quantum Gravity, 85 pages, 15 ...
openaire   +3 more sources

Femtosecond Single‐ and Double‐Pulse Fabrication of Periodic Nanostructures on Stainless Steel for Surface‐Enhanced Raman Spectroscopy

Advanced Engineering Materials, EarlyView.
Periodic submicron features are fabricated on 304 stainless steel using single and double femtosecond laser pulses. By adjusting polarization, fluence, and inter‐pulse delay, 1D and 2D nanostructures are formed. Enhanced hydrophobicity and dense surface‐enhanced Raman spectroscopy hotspots enable analyte detection down to 10−10 M with good ...
Balaji Baskar, Atiqul Islam Ahad, Carla Berrospe‐Rodriguez, Guillermo Aguilar   +3 more
wiley   +1 more source

Numerical and Experimental Study on Multi-Focal Metallic Fresnel Zone Plates Designed by the Phase Selection Rule via Virtual Point Sources

Applied Sciences, 2018
We propose a novel design method for multi-focal metallic Fresnel zone plates (MFZPs), which exploits the phase selection rule by putting virtual point sources (VPSs) at the desired focal points distant to the MFZP plane.
Jinseob Kim, Hyuntai Kim, Gun-Yeal Lee, Juhwan Kim, Byoungho Lee, Yoonchan Jeong   +5 more
doaj   +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

Strong lensing in the MareNostrum Universe: biases in the cluster lens population [PDF]

, 2010
Strong lensing is one of the most direct probes of the mass distribution in the inner regions of galaxy clusters. It can be used to constrain the density profiles and to measure the mass of the lenses. Moreover, the abundance of strong lensing events can
Ameglio, Ascasibar, Bartelmann, Bartelmann, Bartelmann, Bartelmann, Beckwith, Benjamin, Borgani, Borgani, Bradac, Broadhurst, Bryan, C. Fedeli, Cacciato, Clowe, Coe, Dahle, Diego, Dolag, F. Pace, Fedeli, Fedeli, Fedeli, Fedeli, Flores, Fu, Fukazawa, G. Yepes, Gao, Gavazzi, Gavazzi, Gladders, Gottlöber, Gunn, Hennawi, Hennawi, Hilbert, Hoekstra, Jing, Jing, Kaiser, Keeton, Klypin, Kneib, Komatsu, Li, Liedahl, Limousin, Limousin, Luppino, M. Meneghetti, Mantz, Mao, Markevitch, Massey, Meneghetti, Meneghetti, Meneghetti, Meneghetti, Meneghetti, Meneghetti, Meneghetti, Meneghetti, Meneghetti, Merten, Mewe, Mewe, Nagai, Navarro, Oguri, Oguri, Oguri, Oguri, Puchwein, Puchwein, Rasia, Rasia, Rasia, Refregier, Rowley, S. Gottlöber, Sand, Sand, Schindler, Sereno, Shaw, Sheth, Soucail, Spergel, Springel, Torri, Wambsganss, Wambsganss, Yepes, Zaritsky   +95 more
core   +2 more sources

Periscopic Lenses [PDF]

The American Journal of the Medical Sciences, 1904
n ...
openaire   +1 more source

Devil’s lenses

Optics Express, 2007
In this paper we present a new kind of kinoform lenses in which the phase distribution is characterized by the "devil's staircase" function. The focusing properties of these fractal DOEs coined devil's lenses (DLs) are analytically studied and compared with conventional Fresnel kinoform lenses.
Fernando Giménez, Walter D. Furlan, Juan A. Monsoriu, Genaro Saavedra   +3 more
openaire   +3 more sources

Multimaterial Approach to Improve the Mechanical Properties of a Novel Modified Auxetic Reentrant Honeycomb Structure

Advanced Engineering Materials, EarlyView.
A multimaterial approach is introduced to improve upon auxetic structures by combining two different polymers into the same reentrant honeycomb structure via additive manufacturing. The deformation behavior as well as the resulting Poisson's ratio are thereby improved significantly.
Alexander Engel, Oraib Al‐Ketan, Anne Jung   +2 more
wiley   +1 more source

A comparison of posterior capsular opacification after implantation of three different hydrophobic square edge intraocular lenses

Indian Journal of Ophthalmology, 2019
Purpose: To compare the posterior capsular opacification (PCO) after implantation of three types of hydrophobic square edge intraocular lenses (IOLs). Methods: A single-center, hospital-based, cross-sectional, observational study was conducted wherein ...
H Vijaya Pai, Atiya Pathan, Yogish Subraya Kamath   +2 more
doaj   +1 more source

A unified evaluation of iterative projection algorithms for phase retrieval [PDF]

, 2006
Iterative projection algorithms are successfully being used as a substitute of lenses to recombine, numerically rather than optically, light scattered by illuminated objects.
Abrahams J. P., Bates R. H. T., Brègman L. M., Buerger M. J., Gerchberg R., Goodman J. W., Marchesini S., Polak E., Polak E., Press W. H., Rossmann M. G., S. Marchesini, Stark H.   +12 more
core   +2 more sources