Abstract

This paper proposes a method for shaping a light spiral with the desired intensity and phase distributions based on the addition of an angular-dependent amplitude distribution to the phase transmission function of a generalized spiral phase plate. An expression for the amplitude distribution of the illuminating beam, which provides a given intensity distribution in the focal plane along the light spiral, was derived, with the numerically and experimentally obtained results confirming the analytical calculations. The ability to control the phase and intensity gradient along the generated light curves allows one to shape the desired transverse energy flow distribution in the focal plane, which is important for optical manipulation of nano- and microparticles as demonstrated by the laser guiding of trapped 5 µm polystyrene microspheres.

© 2021 Optical Society of America

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Supplementary Material (4)

NameDescription
» Visualization 1       Movement of 5-µm microspheres trapped by the light spiral generated with the only-phase non-encoded GSPP with the transmission functions exp(0.25i*f^3)
» Visualization 2       Movement of 5-µm microspheres trapped by the light spiral generated with the amplitude-phase encoded GSPP with the transmission functions A(r, f)exp(0.25i*f^3)
» Visualization 3       Movement of 5-µm microspheres trapped by the light spiral generated with the only-phase non-encoded GSPP with the transmission functions exp(-0.25i*f^3)
» Visualization 4       Movement of 5-µm microspheres trapped by the light spiral generated with the amplitude-phase encoded GSPP with the transmission functions A(r, f)exp(-0.25i*f^3)

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Equations (24)

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