Daniel Headland. Chun-Chieh Chang, Derek Abbott, Withawat Withayachumnankul, Hou-Tong Chen,
http://ieeexplore.ieee.org/document/8067113/
We present a nonuniform metasurface that operates as a flat lens at 400 GHz. Efficiency is enhanced by the use of a novel, tri-layer polarization-converting nonuniform meta-surface structure. The device is fabricated and experimentally characterized. The results confirm that the flat lens is indeed capable of focusing radiation to a focal spot with ∼68% efficiency. Constrained by spatial dispersion, the −3 dB bandwidth is 150 GHz.
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