Focusing properties of power order space-variant phase modulate Bessel-Gaussian vortex beam

Optik ◽  
2021 ◽  
pp. 168235
Author(s):  
Haoran Zhang ◽  
Jinsong Li ◽  
Yueyang Chen
Keyword(s):  
Vortex Beam ◽  
Space Variant ◽  
Focusing Properties

scholarly journals Longitudinal Component Properties of Circularly Polarized Terahertz Vortex Beams

2021 ◽  
Vol 9 ◽  
Author(s):  
Miao Wang ◽  
Xinke Wang ◽  
Peng Han ◽  
Wenfeng Sun ◽  
Shengfei Feng ◽  
...  
Keyword(s):  
Spot Size ◽  
Longitudinal Component ◽  
Transverse Component ◽  
Quarter Wave Plate ◽  
Phase Plate ◽  
Vortex Beam ◽  
Circularly Polarized ◽  
Left Hand ◽  
Quarter Wave ◽  
Focusing Properties

A circularly polarized vortex beam possesses similar focusing properties as a radially polarized beam. This type of beam is highly valuable for developing optical manufacturing technology, microscopy, and particle manipulation. In this work, a left-hand circularly polarized terahertz (THz) vortex beam (CPTVB) is generated by utilizing a THz quarter wave plate and a spiral phase plate. Focusing properties of its longitudinal component Ez are detailedly discussed on the simulation and experiment. With reducing the F-number of the THz beam and comparing with a transverse component Ex of a general circularly polarized THz beam, the simulation results show that the focal spot size and intensity of its Ez component can reach 87 and 50% of Ex under a same focusing condition. In addition, the experimental results still demonstrate that the left-hand CPTVB can always maintain fine Ez focusing properties in a broad bandwidth, which manifest the feasibility of this class of THz beams.

Tight-focusing properties of linearly polarized circular Airy Gaussian vortex beam

2020 ◽  
Vol 45 (2) ◽  
pp. 296 ◽  
Author(s):  
Jingli Zhuang ◽  
Liping Zhang ◽  
Dongmei Deng
Keyword(s):  
Vortex Beam ◽  
Tight Focusing ◽  
Linearly Polarized ◽  
Focusing Properties

Focusing Properties of Vortex Beam with an Axicon

2012 ◽  
Vol 49 (2) ◽  
pp. 022601
Author(s):  
刘晓云 Liu Xiaoyun ◽  
代雪峰 Dai Xuefeng ◽  
单丽艳 Shan Liyan ◽  
王楠 Wang Nan ◽  
徐送宁 Xu Songning
Keyword(s):  
Vortex Beam ◽  
Focusing Properties

Tight focusing properties of phase modulated azimuthally polarized doughnut Gaussian vortex beam by high NA parabolic mirror

2020 ◽  
Vol 26 ◽  
pp. 3539-3543
Author(s):  
N. Umamageswari ◽  
M. Lavanya ◽  
M. Udhayakumar ◽  
K.B. Rajesh ◽  
Z. Zaroszewicz
Keyword(s):  
Vortex Beam ◽  
Parabolic Mirror ◽  
Tight Focusing ◽  
High Na Parabolic Mirror ◽  
Focusing Properties

Experimental study of the focusing properties of a Gaussian Schell-model vortex beam

2011 ◽  
Vol 36 (16) ◽  
pp. 3281 ◽  
Author(s):  
Fei Wang ◽  
Shijun Zhu ◽  
Yangjian Cai
Keyword(s):  
Experimental Study ◽  
Vortex Beam ◽  
Focusing Properties

An improved magnetic prism design for a transmission electron microscope energy filter

1978 ◽  
Vol 36 (1) ◽  
pp. 40-41 ◽  
Author(s):  
John W. Andrew ◽  
F.P. Ottensmeyer ◽  
E. Martell
Keyword(s):  
Energy Resolution ◽  
Symmetry Plane ◽  
Fringe Field ◽  
Focal Distance ◽  
Electron Trajectories ◽  
Focusing Effect ◽  
Transmission Electron ◽  
Path Lengths ◽  
Electron Microscopes ◽  
Focusing Properties

Energy selecting electron microscopes of the Castaing-Henry prism-mirror-prism design suffer from a loss of image and energy resolution with increasing field of view. These effects can be qualitatively understood by examining the focusing properties of the prism shown in Fig. 1. A cone of electrons emerges from the entrance lens crossover A and impinges on the planar face of the prism. The task of the prism is to focus these electrons to a point B at a focal distance f2 from the side of the prism. Electrons traveling in the plane of the diagram (i.e., the symmetry plane of the prism) are focused toward point B due to the different path lengths of different electron trajectories in the triangularly shaped magnetic field. This is referred to as horizontal focusing; the better this focusing effect the better the energy resolution of the spectrometer. Electrons in a plane perpendicular to the diagram and containing the central ray of the incident cone are focused toward B by the curved fringe field of the prism.

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