Fig. 4. (Color online) Lens prototypes created by 3D printer: (a) r = 2.69 mm (h = 1.7 mm, d = 5.0 mm), (b) r = 3.63 mm (h = 1.0 mm, d = 5.0 mm), (c) r = 3.63 mm (h = 1.0 mm, d = 5.0 mm), and (d) r = 6.63 mm (h = 1.0 mm, d = 10.0 mm), where r, h, and d are the radius of curvature, lens height, and lens diameter, respectively. Prototype c has the same lens profile as that of prototype b but has holes between the lenses.
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