Abstract
An elliptic spiral forked plate (ESFP) is proposed to generate two off-axis elliptic optical vortices, whose topological charges are identified by the numbers of lines in the vortices. Moreover, the number of lines minus one is equal to the absolute value of the topological charge. a and c are the vertical ellipticity factors, which adjust the lengths of the vertical axes for the elliptical vortices generated by φ and ϕ, respectively. b and d are the horizontal ellipticity factors, which adjust the lengths of the horizontal axes for the elliptical vortices generated by φ and ϕ, respectively. φ and ϕ present the elliptic spiral phase plates for the elliptic forked grating and elliptic spiral zone plate, respectively. When ellipticity factors (a, b, c, d) satisfy a = c = 1 and b = d = 0.5, the topological charge identification is the most obvious. At this time, the elliptic vortices are vertical. On the contrary, i.e., a = c = 0.5 and b = d = 1, the elliptic vortices are horizontal. The elliptical vortex can rotate by adjusting the horizontal modulation parameter g. For the vertical and horizontal elliptical vortices, the slopes of the long axes are equal to − 1/g and g, respectively. The ESFP consists of the elliptic forked grating and elliptic spiral zone plate with the topological charges l1 and l2 respectively. The left and right elliptic vortices have the topological charges of l2 – l1 and l2 + l1, respectively. The method of constructing the ESFP is illustrated. It is proved in the simulations and experiments that the topological charges of the two elliptic vortices can be identified by the numbers of the lines. The proposed zone plate is used for optical trapping, optical communication and optical imaging.
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The research was financially supported by the Fundamental Research Funds for the Central Universities of Central South University, China (Grant No. 2020zzts043), and the Central South University of College Students’ Innovation and Entrepreneurship Project (20210010020032, 20210010020015).
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Xia, T., Huang, X., Zhao, H. et al. Two off-axis elliptic optical vortices generated by an elliptic spiral forked plate. Appl. Phys. B 128, 176 (2022). https://doi.org/10.1007/s00340-022-07895-8
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DOI: https://doi.org/10.1007/s00340-022-07895-8