Fig. 1. (a) Top view of the printed lens. (b) Side view of the printed lens.

Fig. 2. Characterizations of the polymer “FullCure835 VeroWhite.” The black curve is the refractive index, and the blue curve is the absorption coefficient.

Fig. 3. Diagram of a lens illuminated by a Gaussian beam. R, curvature radius; r, radius of the lens; t, thickness; f, focal length.

Fig. 4. (a) 2D FDTD simulated intensity distribution of the focused Gaussian beam. (b) Axial normalized intensity distribution behind the printed lens [cutting along the red line in (a)]. (c) Lateral normalized intensity distribution [cutting along the green line in (a)].

Fig. 5. Experimental setup: Transmitter, Gunn Diode; Collimator, spherical lens; Detector, Schottky diode.

Fig. 6. (a) 2D Gaussian beam intensity profile images obtained by the point-scanning method. (b) Curve fitting (the red line) of the measured radial intensity distribution at d=95  mm. (c) FWHM (the red line) and the axial maximal intensity distribution (the blue line) over the propagation distance.