Abstract

We aim here to show that azimuthal structuring of the optical beam may be realized by apodizing a spiral zone plate using an azimuthal-modulated Bessel function. Furthermore, we demonstrate that the azimuthal modulation of a Bessel beam may cause its transmittance to take negative values in azimuth. Accordingly, when a diffractive element (herein, spiral zone plate) is apodized by such a modulated Bessel function, its transmittance undergoes an azimuthal phase change. Consequently, the phase change is imposed on a beam passing through the element. This means that the technique enables us to produce a variety of azimuthal beam shapes, such as spiral, ring-lattice, light-arm, and multi-spot beams. In this research, we illustrate how these structures and shapes are produced and tailored. To verify the consequences of the simulation, corresponding experiments were planned.

© 2019 Optical Society of America

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References

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Supplementary Material (3)

NameDescription
» Visualization 1       It describes transverse varying of the intensity of a diffracted plane beam from azimuthal modulated spiral zone plate (ABSZP) upon propagation along the propagation axis around the focus. Feature of ABSZP is m = 2, p = 2, n = 0, η = 0.2.
» Visualization 2       It describes transverse varying of the intensity of a diffracted plane beam from azimuthal modulated spiral zone plate (ABSZP) upon propagation along the propagation axis around the focus. Feature of ABSZP is m = 5, p = 2, n = 0, η = α = 0.
» Visualization 3       It describes transverse varying of the intensity of a diffracted plane beam from azimuthal modulated spiral zone plate (ABSZP) upon propagation along the propagation axis around the focus. Feature of ABSZP is m = 5, p = 1, n = 0, η = α = 0.

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Figures (17)

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Equations (8)

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