An ultra-compact, ultra-broadband vertical coupler for dense photonic integrated circuits is reported with a 1.07 � 0.62 μm 2 wavelength-scale footprint. This hybrid plasmonicphotonic coupler uses a unique two-plane plasmonic nanoantenna array on a siliconon-insulator waveguide. The in-and out-of-plane interference of the multipole moments and dual-feed nanoantennas results in efficient, unidirectional coupling. Finiteelement simulations show that, for a 0.8 μm diameter Gaussian beam, the maximum coupling efficiency (CE) is −3.4 dB across the telecommunication C-, L-and U-bands with a 3-dB bandwidth of 230 nm. The CE is > 9 dB higher than recently reported ultra-compact plasmonic couplers. The maximum directivity and polarisation extinction ratio across the C-to U-bands are 9.2 and 24.1 dB, respectively. Finally, as an out-coupler, it has a vertical directivity of >8.5 dB, enabling its use for vertical optical interconnects between two vertically separated circuits.

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