Vectorial Diffraction Analysis of Near-Field Focusing of Perfect Black Fresnel Zone Plates Under Various Polarization States

2011 ◽  
Vol 29 (6) ◽  
pp. 822-829 ◽  
Author(s):  
Luis Carretero Lopez ◽  
Manuel Perez Molina ◽  
Pablo Acebal Gonzalez ◽  
Salvador Blaya Escarre ◽  
Antonio Fimia Gil ◽  
...  
Keyword(s):  
Diffraction Analysis ◽  
Fresnel Zone ◽  
Near Field ◽  
Fresnel Zone Plates ◽  
Zone Plates ◽  
Polarization States

Near-Field Electromagnetic Analysis of Perfect Black Fresnel Zone Plates Using Radial Polarization

2011 ◽  
Vol 29 (17) ◽  
pp. 2585-2591 ◽  
Author(s):  
Luis Carretero ◽  
Manuel Perez-Molina ◽  
Salvador Blaya ◽  
Pablo Acebal ◽  
Antonio Fimia ◽  
...  
Keyword(s):  
Fresnel Zone ◽  
Near Field ◽  
Electromagnetic Analysis ◽  
Radial Polarization ◽  
Fresnel Zone Plates ◽  
Zone Plates

scholarly journals Analysis of Predistortion Techniques on Fresnel Zone Plates in Ultrasound Applications

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5066
Author(s):  
José Miguel Fuster ◽  
Sergio Pérez-López ◽  
Francisco Belmar ◽  
Pilar Candelas
Keyword(s):  
Intensity Distribution ◽  
Fresnel Zone ◽  
Focal Depth ◽  
Acoustic Intensity ◽  
Fresnel Zone Plates ◽  
Therapeutic Applications ◽  
Zone Plates ◽  
Ultrasound Applications

In this work, we analyze the effect of predistortion techniques on the focusing profile of Fresnel Zone Plates (FZPs) in ultrasound applications. This novel predistortion method is based on either increasing or decreasing the width of some of the FZP Fresnel rings by a certain amount. We investigate how the magnitude of the predistortion, as well as the number and location of the predistorted rings, influences the lens focusing profile. This focusing profile can be affected in different ways depending on the area of the lens where the predistortion is applied. It is shown that when the inner area of the lens, closer to its center, is predistorted, this technique allows the control of the focal depth at the main focus. However, when the predistortion is applied to an area farther from the center of the lens, the acoustic intensity distribution among the main focus and the closest adjacent secondary foci can be tailored at a certain degree. This predistortion technique shows great potential and can be used to control, modify and shape the FZP focusing profile in both industrial and therapeutic applications.

APD-based x-ray imaging telescope using Fresnel zone plates for extremely high spatial resolution

2005 ◽  
Author(s):  
Michael R. Squillante ◽  
Richard A. Myers ◽  
Mitchell Woodring ◽  
James F. Christian ◽  
Frank Robertson ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Fresnel Zone ◽  
Fresnel Zone Plates ◽  
X Ray ◽  
Zone Plates ◽  
X Ray Imaging ◽  
Imaging Telescope

Fresnel zone plates for two wavelengths

1995 ◽  
Author(s):  
Eugene O. Curatu ◽  
Roxana N. Radvan ◽  
Roxana Savastru
Keyword(s):  
Fresnel Zone ◽  
Fresnel Zone Plates ◽  
Zone Plates

Diffraction phenomena inside thick Fresnel zone plates

Radio Science ◽  
1996 ◽  
Vol 31 (6) ◽  
pp. 1815-1822 ◽  
Author(s):  
Yuri V. Kopylov ◽  
Alexei V. Popov ◽  
Alexander V. Vinogradov
Keyword(s):  
Fresnel Zone ◽  
Fresnel Zone Plates ◽  
Zone Plates
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