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

Validation of vectorial theories for the focusing of high numerical aperture Fresnel zone plates

2018 ◽  
Vol 429 ◽  
pp. 119-126 ◽  
Author(s):  
Qiang Liu ◽  
Tao Liu ◽  
Shuming Yang ◽  
Tong Wang ◽  
Yiming Wang
Keyword(s):  
Fresnel Zone ◽  
Numerical Aperture ◽  
Fresnel Zone Plates ◽  
High Numerical Aperture ◽  
Zone Plates

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 spin to orbital angular momentum conversion on guided zone plates

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Pablo Acebal ◽  
Luis Carretero ◽  
Salvador Blaya
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Fresnel Zone ◽  
Numerical Aperture ◽  
Diffraction Theory ◽  
Fresnel Zone Plates ◽  
Zone Plates ◽  
Guided Mode ◽  
Fdtd Methods ◽  
Selection Of

AbstractFocusing systems with high numerical aperture can be used to convert spin angular momentum into orbital angular momentum with efficiencies of 50%, while for low numerical apertures this conversion vanishes. In this paper, based on the properties of binary Fresnel zone plates, we propose a structure that is achieved by making an accurate selection of the width and the depth of the rings. This allows us to obtain a large increase in the spin to orbital angular momentum conversion of the resulting focusing fields, and it also has the special characteristic that the obtained conversion is higher for low numerical aperture structures, where standard focusing systems do not work. The ability of the system to perform this extraordinary conversion is demonstrated by FDTD methods and an analytical model developed using a combination of guided mode theory for the structure and Stratton–Chu diffraction theory.

scholarly journals Extraordinary Spin to Orbital Angular Momentum Conversion on Guided Zone Plates

2021 ◽  
Author(s):  
Pablo Acebal ◽  
Luis Carretero ◽  
Salvador Blaya
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Fresnel Zone ◽  
Numerical Aperture ◽  
Diffraction Theory ◽  
Fresnel Zone Plates ◽  
Zone Plates ◽  
Guided Mode ◽  
Fdtd Methods ◽  
Selection Of

Abstract Focusing systems with high numerical aperture can be used to convert spin angular momentum into orbital angular momentum with efficiencies of 50%, while for low numerical apertures this conversion vanishes. In this paper, based on the properties of binary Fresnel zone plates, we propose a structure that is achieved by making an accurate selection of the width and the depth of the rings. This allows us to obtain a large increase in the spin to orbital angular momentum conversion of the resulting focusing fields, and it also has the special characteristic that the obtained conversion is higher for low numerical aperture structures, where standard focusing systems do not work. The ability of the system to perform this extraordinary conversion is demonstrated by FDTD methods and an analytical model developed using a combination of guided mode theory for the structure and Stratton-Chu diffraction theory.

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.

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