Open AccessPropagation Property of a Second-order Noncanonical Optical Vortex Beam in a Strongly Focusing System
Author(s) -
Han Zhang,
Weiwei Xiao,
Tianhu Zhang,
Zhaoxinying,
Xiaoyan Pang
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2112/1/012022
Subject(s) - optical vortex , physics , vortex , optics , field (mathematics) , beam (structure) , cardinal point , transverse plane , plane (geometry) , phase (matter) , azimuth , order (exchange) , quantum mechanics , geometry , mechanics , mathematics , structural engineering , finance , pure mathematics , economics , engineering
The noncanonical optical vortex is an optical vortex with a nonconstant phase gradient around its center, i.e. the phase is not a linear function of the azimuthal angle. The expression of the strongly focused field of a (conventional) second order noncanonical vortex beam has been derived analytically and the field distribution is discussed. It has been found that the intensity distribution at the focal plane can exbibit rich patterns, which is more complicated than that of the first-order. The transverse focal shift phenomenon in current case also exits and is changed with the semi-aperture angle α in a different way. It also can be seen that the intensity maxima can be one to four on the focal plane. Our research may provide a new method for controlling of the structured optical field, and will give theoretical supports for the study of higher-order noncanonical optical vortices.