scholarly journals Focusing properties of Fresnel zone plates with spiral phase

2010 ◽  
Vol 18 (12) ◽  
pp. 12818 ◽  
Author(s):  
Binzhi Zhang ◽  
Daomu Zhao
Keyword(s):  
Fresnel Zone ◽  
Fresnel Zone Plates ◽  
Zone Plates ◽  
Spiral Phase ◽  
Focusing Properties

Tunable focusing properties using optofluidic Fresnel zone plates

Lab on a Chip ◽  
2016 ◽  
Vol 16 (23) ◽  
pp. 4554-4559 ◽  
Author(s):  
Y. Shi ◽  
X. Q. Zhu ◽  
L. Liang ◽  
Y. Yang
Keyword(s):  
Real Time ◽  
Fresnel Zone ◽  
Hybrid Structure ◽  
Zone Plate ◽  
Fresnel Zone Plate ◽  
Fresnel Zone Plates ◽  
The Real ◽  
Zone Plates ◽  
Solid Liquid ◽  
Focusing Properties

This paper demonstrates the real-time tunable focusing properties of Fresnel zone plate using solid–liquid hybrid structure.

scholarly journals Extraordinary optical transmission and vortex excitation by periodic arrays of Fresnel zone plates

2013 ◽  
Vol 61 (4) ◽  
pp. 855-861 ◽  
Author(s):  
A. Roszkiewicz ◽  
W. Nasalski
Keyword(s):  
Optical Transmission ◽  
Fresnel Zone ◽  
Extraordinary Optical Transmission ◽  
Fresnel Zone Plates ◽  
Circularly Polarized ◽  
Periodic Arrays ◽  
Zone Plates ◽  
Short Transverse ◽  
Incident Plane ◽  
Focusing Properties

Abstract Extraordinary optical transmission and good focusing properties of a two-dimensional scattering structure is presented. The structure is made of Fresnel zone plates periodically arranged along two orthogonal directions. Each plate consists of two ring-shaped waveguides supporting modes that match the symmetry of a circularly polarized incident plane wave. High field concentration at the focal plane is obtained with the short transverse and long longitudinal foci diameters. Optical vortex excitation in a paraxial region of the transmitted field is also observed and analysed in terms of cross-polarisation coupling. The structure presented may appear useful in visualization, trapping and precise manipulations of nanoparticles.

Electromagnetic exploration of focusing properties of high-numerical-aperture micro-Fresnel zone plates

2018 ◽  
Vol 426 ◽  
pp. 41-45 ◽  
Author(s):  
Suqin Xue ◽  
Qiang Liu ◽  
Tao Liu ◽  
Shuming Yang ◽  
Pengfei Su ◽  
...  
Keyword(s):  
Fresnel Zone ◽  
Numerical Aperture ◽  
Fresnel Zone Plates ◽  
High Numerical Aperture ◽  
Zone Plates ◽  
Focusing Properties

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
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