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 AmericaFull Article | PDF Article
OSA Recommended Articles
Seyyed Mojtaba Taheri Balanoi and Arash Sabatyan
J. Opt. Soc. Am. B 35(11) 2667-2673 (2018)
Jila Rafighdoost and Arash Sabatyan
J. Opt. Soc. Am. B 34(3) 608-612 (2017)
J. Opt. Soc. Am. B 36(11) 3111-3116 (2019)