(Nature Publishing Group UK, 2018) Groever, Benedikt; Rubin, Noah; Mueller, J. P. Balthasar; Devlin, Robert C.; Capasso, Federico
We present here a compact metasurface lens element that enables simultaneous and spatially separated imaging of light of opposite circular polarization states. The design overcomes a limitation of previous chiral lenses reliant on the traditional geometric phase approach by allowing for independent focusing of both circular polarizations without a 50% efficiency trade-off. We demonstrate circular polarization-dependent imaging at visible wavelengths with polarization contrast greater than 20dB and efficiencies as high as 70%.
