Fig. 1. Diffraction intensity patterns obtained for pairs of dielectric rectangles with different heights H=0.53, 0.80, 1.20 μm from left to right and width W=0.4μm.

Fig. 2. Phase distribution obtained for pairs of dielectric rectangles with different heights H=0.53, 0.80, 1.20 μm from left to right and width W=0.4μm.

Fig. 3. Variation of the normalized focusing power (black curve with squares) and the optimized π-dephasing rectangle heights (blue curve with disks) with respect to the width.

Fig. 4. Diffraction intensity patterns obtained for pairs of dielectric rectangles with optimized dimensions (W=0.40μm and H=0.80μm). The first and the second rows represent the TE and TM polarizations. From left to right, the columns represent the blue, green, and red wavelengths, respectively.

Fig. 5. Schematic of the experimental characterization set-up.

Fig. 6. Experimental 3D intensity distribution below the diffractive polymer microlines.

Fig. 7. First and second rows: intensity distributions along the longitudinal focal axis (x=0, z) and intensity distributions along the lateral focal axis (x, z=Zf). Solid black and red lines represent TE and TM polarization for simulations. Dotted lines for experimental data after deconvolution. Left, middle, and right columns are for blue, green, and red color splitting, respectively.