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4 May 2018 Investigating the optical properties of nanogap optical antennas
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We investigate the optical properties of nanogap MIM nanoantennas with a 2.1 nm thick gap. These plasmonic nanoantennas consist of a gold film, an insulating layer deposited by Atomic Layer Deposition, and a periodically structured gold layer. MIM nanoantennas are characterized by a tunable spectral response and a high field confinement within the nanogap. Nanometric gaps enable high coupling between the plasmons of the top and bottom metal surfaces. We demonstrated an excellent agreement between optical measurements and classical electromagnetic simulations. In particular, we observed a fluctuation in the gap thickness of 0.2 nm.
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Ludivine Emeric, Claire Deeb, Alan Durnez, Nathalie Bardou, Riad Haïdar, Fabrice Pardo, and Jean-Luc Pelouard "Investigating the optical properties of nanogap optical antennas", Proc. SPIE 10672, Nanophotonics VII, 1067232 (4 May 2018);

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