Results 21 to 30 of about 8,681 (211)
Chromatically-corrected, high-efficiency, multi-colour, multi-plane 3D imaging [PDF]
, 2012 It is shown that grisms, a grating and prism combination, are a simple way to achieve chromatic control in 3D multi-plane imaging. A pair of grisms, whose separation can be varied, provide a collimated beam with a tuneable chromatic shear from a ...
Dalgarno, Paul A +5 more
core +1 more source
Deployable Fresnel Zone Plate Antenna for CubeSats
IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium, 2023 Earth observation satellite missions are becoming increasingly important and have been also boosted by the appearance of small satellites, affordable to small companies and universities. Technology miniaturization and the reduction in power consumption have been a key point in the reduction of the dimensions of these spacecrafts, being able to ...
Garcia Morilla, Alejandro +7 more
openaire +1 more source
Optimized square Fresnel zone plates for microoptics applications [PDF]
, 2009 Polygonal Fresnel zone plates with a low number of sides have deserved attention in micro and nanoptics, because they can be straightforwardly integrated in photonic devices, and, at the same time, they represent a balance between the high-focusing ...
Alda, Javier +3 more
core +1 more source
Pinhole Zone Plate Lens for Ultrasound Focusing
Sensors, 2017 The focusing capabilities of a pinhole zone plate lens are presented and compared with those of a conventional Fresnel zone plate lens. The focusing properties are examined both experimentally and numerically.
Constanza Rubio +5 more
doaj +1 more source
Bifocal Ultrasound Focusing Using Bi-Fresnel Zone Plate Lenses
Sensors, 2020 In this work, we present a bifocal Fresnel zone plate (BiFZP) capable of generating focusing profiles with two different foci. The performance of the BiFZP is demonstrated in the ultrasound domain, with a very good agreement between the experimental ...
Sergio Pérez-López +5 more
doaj +1 more source
Generalised photon sieves: fine control of complex fields with simple pinhole arrays [PDF]
, 2015 Spatial shaping of light beams has led to numerous new applications in fields such as imaging, optical communication, and micromanipulation. However, structured radiation is less well explored beyond visible optics, where methods for shaping fields are ...
Li, F. +3 more
core +1 more source
Lacunar fractal photon sieves [PDF]
, 2007 We present a new family of diffractive lenses whose structure is based on the combination of two concepts: photon sieve and fractal zone plates with variable lacunarity. The focusing properties of different members of this family are examined.
Andersen +18 more
core +2 more sources
Design of Binary-Sequence Zone Plates in High Wavelength Domains
Sensors, 2018 The design of zone plates is an important topic in many areas of physics, such as optics, X-rays, microwaves or ultrasonics. In this paper, a zone plate design method, which provides high flexibility in the shaping of the focusing profile, is analyzed ...
José Miguel Fuster +3 more
doaj +1 more source
Компьютерная оптика, 2021 Binary Fresnel zone plates (ZP) are one of the most frequently used focusing elements of inplane optical schemes in micro- and nanophotonics. With a decrease in the diameter and focal distance of the ZP to meso-wavelength sizes, the parameters of the ...
Y.E. Geints +3 more
doaj +1 more source
Zone-plate focusing of Bose-Einstein condensates for atom optics and erasable high-speed lithography of quantum electronic components [PDF]
, 2009 We show that Fresnel zone plates, fabricated in a solid surface, can sharply focus atomic Bose-Einstein condensates that quantum reflect from the surface or pass through the etched holes.
A M Martin +17 more
core +2 more sources