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BPSSZPs with different topological charge and their simulated diffraction image in the focal plane. [(a) and (e)] corresponds to BPSSZP, [(b) and (f)] to , [(c) and (g)] to , and [(d) and (h)] to . In the simulation, the wavelength of incident light is 355 nm, and the focal length is 1.5 cm. The total simulation area is .
Phase profile near the center vortex core in the focal plane of (a) , (b) , and (c) BPSSZPs. The total simulation area is .
Experimental results. (a) ×50 microscopy image of our BPSSZP near the center. (b) ×500 microscopy image of the BPSSZP near the outermost zones. (c) Experimental system for optical demonstration of a BESSZP. Diffraction patterns of the BPSSZP are imaged by CCD at (d) , (e) , and (f) .
Topological charge of BPSSZP and the center vortex core in the focal plane.
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