Effect of Complex Phase Plate on Tight Focusing of Azimuthally Polarized Dark and Anti-dark Gaussian Beam
J. Environ. Nanotechnol., Volume 8, No 3 (2019) pp. 01-06
Abstract
This study was focused on azimuthally polarized Dark and Anti-dark Gaussian (DADG) beams passing through a high numerical aperture lens (NA). The Vector Diffraction theory was used to study the lens theoretically. It was reported that with appropriate phase modulation of the input DADG beam, the intensity distribution of the focused region can be modified to be a focal hole segment with numerous focal holes separated by varied axial distances. A chain of focal hole segments like this can be used for multiple trapping of low refractive index particles as well as an erase beam for STED microscopy with a high screening rate.
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Reference
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