Fig. 1. Microlens array of a Gabor superlens.

Fig. 2. Parameters of a liquid tunable lens that works by electrowetting.

Fig. 3. Micro-tunable lenses are placed in the third array (MLA3).

Fig. 4. Variation of the second radius of curvature produced by a voltage range between 0 V and 115 V.

Fig. 5. Simulation of GSL with an array of micro-tunable liquid lens with V=115V and a radius of curvature of −0.061 in the middle surface of the third array.

Fig. 6. Spot registered by the detector in the simulation of the GSL with an array of micro-tunable liquid lenses as MLA3 applying a voltage (V) and a radius of curvature (rc) in the middle surface of the third array: (a) V=0V and rc=∞, (b) V=100V and rc=−0.204, (c) V=105V and rc=−0.117, (d) V=110V and rc=−0.081, and (e) V=115V and rc=−0.061.

Fig. 7. Total Seidel aberration coefficients plotted for increasing values of the focal distance. Observe that the central channel with all aberrations is close to zero except for the spherical aberration, as shown in (a). Other channels show an increase of all aberration coefficients except for field curvature, as shown in (b) and (c).

Fig. 8. Zoom of the ray tracing at the detector (image plane) of the GSL system with (a) V=100V and rc=−0.204, and (b) V=115V and rc=−0.061. An apparent trade-off between transverse and longitudinal ray aberrations is observed as a zoom is performed close to the focal plane. This explains the behavior of the focal spot size as the focal distance varies.

Table 1. Optical Parameters of the GSL System When the Second Radius of Curvature of the Liquid Micro-Tunable Lens Is rc and Gabor Focal Length Is F^a

Table 2. Peak Incoherent Irradiance Distribution for Each Voltage

Table 3. Radius of Curvature (rc), Focal Length of the Doublets f, and Gabor Focal Length (F) of the GSL System as Functions of the Change of Voltage from 100 V to 115 V