In view of the current controversy relating to the optimum design of compact disks, we investigate the phase behavior of focused electromagnetic beams in the neighborhood of the geometrical focus. The analysis indicates that the spacing of the co-phasal surfaces of the electric field depends strongly on numerical aperture.
© 2004 Optical Society of America
J. T. Foley and E. Wolf, "On the phase behavior in focused electromagnetic waves," in Frontiers in Optics 2004/Laser Science XXII/Diffractive Optics and Micro-Optics/Optical Fabrication and Testing, OSA Technical Digest Series (Optical Society of America, 2004), paper FTuM4.
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