Results 211 to 220 of about 99,715 (244)

Tunable focusing properties using optofluidic Fresnel zone plates

Lab on a Chip, 2016
This paper demonstrates the real-time tunable focusing properties of Fresnel zone plate using solid–liquid hybrid structure.
Y, Shi, X Q, Zhu, L, Liang, Y, Yang
openaire   +2 more sources

Fresnel Zone Plate Generation

Applied Optics, 1967
J, Camus, F, Girard, R, Clark
openaire   +2 more sources

Millimeter-wave Fresnel zone plate antennas

SPIE Proceedings, 1994
Fresnel zone plate antennas have seen extensive research in recent years. Both transmission and reflection types have been analyzed and tested, and found to give excellent performance. Parameters such as far-field patterns, gain, efficiency, frequency dependence, aberrations, scan capability, focal region properties, and off-axis performance have been ...
openaire   +1 more source

[Thyroid scintigraphy with Fresnel zone plates].

Nuklearmedizin. Nuclear medicine, 1985
Coded apertures supply a decoupling of resolution and sensitivity in scintigraphic imaging. The reconstructed images are focussed on different planes. The approach presented replaces the conventional collimator by three Fresnel zone plates in order to simulate a complex projection.
J, Meinke, W, Müller-Schauenburg, W, Kaiser   +2 more
openaire   +1 more source

Variations on the Fresnel Zone Plate

Journal of the Optical Society of America, 1966
The effects of contrast in the Fresnel zone plate on the amplitude in the focal point due to a normally incident plane wave are obtained by direct evaluation of the Fresnel–Kirchhoff diffraction integral. The change in focal-point amplitude due to smoothing the ordinary, discontinuous, “square-wave” transmission function into a continuous, “sine-wave ...
openaire   +1 more source

Compact Folded Fresnel Zone Plate Lens Antenna for mm-Wave Communications

IEEE Antennas and Wireless Propagation Letters, 2018
Mohammad Reza Dehghani Kodnoeih, Y. Letestu, R. Sauleau, E. Motta Cruz, A. Doll   +4 more
semanticscholar   +1 more source

Fresnel Zone Plates

2011
openaire   +1 more source

Focusing Properties of Fresnel Zone Plate Lens Antennas in the Near-Field Region

IEEE Transactions on Antennas and Propagation, 2011
Shaya Karimkashi
exaly  

Fresnel Zone Plate

2013
openaire   +1 more source

Demonstration of 12 nm Resolution Fresnel Zone Plate Lens based Soft X-ray Microscopy

Optics Express, 2009
Weilun Chao, Peter Fischer
exaly