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Nano Lett. 2013 Sep 11;13(9):4539-45. doi: 10.1021/nl402580c. Epub 2013 Aug 23.

Functional plasmonic nanocircuits with low insertion and propagation losses.

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Institute of Optics, Information and Photonics, Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nuremberg (FAU) and Max Planck Institute for the Science of Light , 91058 Erlangen, Germany.


We experimentally demonstrate plasmonic nanocircuits operating as subdiffraction directional couplers optically excited with high efficiency from free-space using optical Yagi-Uda style antennas at λ0 = 1550 nm. The optical Yagi-Uda style antennas are designed to feed channel plasmon waveguides with high efficiency (45% in coupling, 60% total emission), narrow angular directivity (<40°), and low insertion loss. SPP channel waveguides exhibit propagation lengths as large as 34 μm with adiabatically tuned confinement and are integrated with ultracompact (5 × 10 μm(2)), highly dispersive directional couplers, which enable 30 dB discrimination over Δλ = 200 nm with only 0.3 dB device loss.

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