Open AccessTight focusing of circularly polarized light limited by semicircular aperture
Author(s) -
В. Д. Зайцев,
Sergey S. Stafeev,
V. V. Kotlyar
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 - 10.1088/1742-6596/2103/1/012164
Subject(s) - optics , physics , polarization (electrochemistry) , azimuth , circular polarization , cardinal point , wavelength , aperture (computer memory) , angular aperture , elliptical polarization , focal length , lens (geology) , linear polarization , laser , chemistry , acoustics , microstrip
In this work, the focusing of a circularly polarized plane wave (wavelength 532 nm) was simulated by a lens with a numerical aperture NA = 0.95. The wave front was considered flat. When integrating according to the Richards-Wolf formulas, the semicircular aperture was set by limiting the azimuthal angle from 0 to π. It was shown that when focusing light with right and left circular polarization, the focal spot turns out to be elliptical - elongated along the y axis, and, depending on the direction of polarization, its center shifts by about 0.05 μm in different directions along the x axis. It was also shown that the reverse flow region is located near the focal spot (at a distance of 0.25 μm from the center). Depending on the direction of polarization, it is located either to the right or to the left of the focal spot. Thus, the polarization state of the incident radiation can be determined from the displacement of the spot in focus.