We report the first experimental demonstration of far-field lensing using a plasmonic slit array. We implement a planar
nano-slit lens using a combination of thin film deposition and focused ion beam milling. Our lens structures consist of
optically thick gold films with micron-size arrays of closely-spaced, nanoscale slits of varying widths milled using a
focused ion beam. We demonstrate experimentally that it acts as a far-field cylindrical lens for light at optical
frequencies. We show excellent agreement between the full electromagnetic field simulations of the design, which
include both evanescent and propagating modes, and the far-field, diffraction-limited confocal measurements on
manufactured structures. The flexibility offered by these slit-based planar lenses allows for the design of microlenses
that compensate for oblique illumination in integrated opto-electronic systems, such as complementary metal-oxide
semiconductor (CMOS) image sensors.
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