Dependence of the focal spot parameters on the relief height of the amplitude zone plate

2017 ◽  
Author(s):  
Elena S. Kozlova ◽  
Victor V. Kotlyar ◽  
Anton G. Nalimov ◽  
Sergey S. Stafeev ◽  
Maria V. Kotlyar ◽  
...  
Keyword(s):  
Focal Spot ◽  
Zone Plate ◽  
Relief Height

scholarly journals Elongated Photonic Nanojet from Truncated Cylindrical Zone Plate

2012 ◽  
Vol 2012 ◽  
pp. 1-3 ◽  
Author(s):  
Sergey S. Stafeev ◽  
Victor V. Kotlyar
Keyword(s):  
Focal Spot ◽  
Zone Plate ◽  
Cylinder Surface ◽  
Dielectric Cylinder ◽  
Depth Of Focus ◽  
Photonic Nanojet

Previously (Chen et al., 2004), it was shown that dielectric cylinder can form focal spots with small diameters and long depth. This type of focal spot was called photonic nanojet. In this paper, it was shown that dielectric cylinder of radius 595 nm (1.12 of wavelength) forms near the surface a photonic nanojet with diameter equal to 0.31 of wavelength and depth of focus equal to 0.57 of wavelength. Adding truncated concentric rings with radiuses equal to radiuses of zone plate to the cylinder increases the depth of focus to 1.18 of the wavelength. The diameter and intensity of focal spot near the cylinder surface remain unchanged.

scholarly journals Comparison of the focused optical vortices produced by high-aperture phase conventional and spiral zone plates

2021 ◽  
Vol 2103 (1) ◽  
pp. 012175
Author(s):  
A A Savelyeva ◽  
E S Kozlova ◽  
V V Kotlyar
Keyword(s):  
Gaussian Beam ◽  
Focal Plane ◽  
Topological Charge ◽  
Focal Spot ◽  
Zone Plate ◽  
Fdtd Simulation ◽  
Optical Vortices ◽  
Phase Zone ◽  
Linearly Polarized ◽  
Sharp Focusing

Abstract Using the FDTD simulation, sharp focusing of a linearly polarized Gaussian beam with an embedded topological charge m = 3 by a phase zone plate and focusing of a Gaussian beam by a phase spiral zone plate with topological charge m = 3 were studied. The obtained results showed that proposed elements formed different patterns of intensity at a focal plane. The spiral zone plate forms a focal spot with three petals. At a distance of 13.5 μm from the focus, the lobe structure of the intensity (and energy flux) is replaced by an annular distribution.

scholarly journals Investigation of the influence of amplitude spiral zone plate parameters on produced energy backflow

2019 ◽  
Vol 43 (6) ◽  
pp. 1093-1097
Author(s):  
E.S. Kozlova
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Energy Flow ◽  
Optical Axis ◽  
Longitudinal Component ◽  
Zone Plate ◽  
Optical Vortices ◽  
Relief Height ◽  
Vortex Beams ◽  
Difference Time

Investigation of the influence of parameters of silver, aluminum, gold, and chromium spiral zone plates on the longitudinal component of Umov-Pointing vector in produced optical vortices by using the frequency-dependent finite-difference time-domain method is presented. It is shown that the aluminum spiral zone plate with a relief height of 50 nm gives an optical vortex with the smallest longitudinal component of Umov-Pointing vector on the optical axis. The gold spiral zone plate is the least effective for the formation of vortex beams with a reverse energy flow.

XRMF applications of a monolithic, polycapillary, focusing x-ray optic

1996 ◽  
Vol 54 ◽  
pp. 240-241
Author(s):  
D. A. Carpenter ◽  
Ning Gao ◽  
G. J. Havrilla
Keyword(s):  
Trace Elements ◽  
Point Source ◽  
Focal Spot ◽  
Fluorescence Analysis ◽  
X Rays ◽  
Focal Distance ◽  
Spot Diameter ◽  
X Ray ◽  
Focal Spot Diameter

A monolithic, polycapillary, x-ray optic was adapted to a laboratory-based x-ray microprobe to evaluate the potential of the optic for x-ray micro fluorescence analysis. The polycapillary was capable of collecting x-rays over a 6 degree angle from a point source and focusing them to a spot approximately 40 µm diameter. The high intensities expected from this capillary should be useful for determining and mapping minor to trace elements in materials. Fig. 1 shows a sketch of the capillary with important dimensions.The microprobe had previously been used with straight and with tapered monocapillaries. Alignment of the monocapillaries with the focal spot was accomplished by electromagnetically scanning the focal spot over the beveled anode. With the polycapillary it was also necessary to manually adjust the distance between the focal spot and the polycapillary.The focal distance and focal spot diameter of the polycapillary were determined from a series of edge scans.

HIGH RESOLUTION X-RAY MICROSCOPY WITH ZONE PLATE MICROSCOPES

1984 ◽  
Vol 45 (C2) ◽  
pp. C2-77-C2-81 ◽  
Author(s):  
G. Schmahl ◽  
D. Rudolph ◽  
B. Niemann
Keyword(s):  
High Resolution ◽  
Zone Plate ◽  
X Ray

Computational Technique for the Qualification of Focal Spot Size and Shape of Industrial Radioscopy Equipment Using Star Patterns

2020 ◽  
Vol 78 (4) ◽  
pp. 479-486
Author(s):  
Marcela Tatiana Fernandes Beserra ◽  
◽  
Ricardo Tadeu Lopes ◽  
Davi Ferreira de Oliveira ◽  
Claudio Carvalho Conti ◽  
...  
Keyword(s):  
Focal Spot ◽  
Spot Size ◽  
Computational Technique ◽  
Focal Spot Size ◽  
Size And Shape
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