Open AccessDynamical generation of multiple focal spot pairs with controllable position and polarization
Author(s) -
Yuxing Zhang,
Jian Chen,
Chunli Bai,
Dawei Zhang,
Qiwen Zhan
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.400735
Subject(s) - optics , cardinal point , polarization (electrochemistry) , physics , diffraction , numerical aperture , ray , exit pupil , entrance pupil , stokes parameters , physical optics , wavelength , dipole , lens (geology) , scattering , pupil , chemistry , quantum mechanics
We report a flexible method to dynamically generate multiple sub-wavelength focal spot pairs with adjustable polarization, position and number at the focal plane of a high numerical aperture (NA) objective lens. The desired incident field on the pupil plane can be analytically derived by employing the time-reversed method combined with the dipole antenna radiation theory. The numerical simulations of the corresponding tightly focused field are conducted using the Richards-Wolf vectorial diffraction theory. The validity of the presented method is demonstrated through experimental generation of several designed pupil fields with a versatile vectorial optical field generator and characterization of the produced focused fields with Stokes parameter measurements.