Direct characterization of plasmonic slot waveguides and nanocouplers

Abstract

We demonstrate the use of amplitude- and phase-resolved near-field mapping for direct characterization of plasmonic slot waveguide mode propagation and excitation with nanocouplers in the telecom wavelength range. We measure mode's propagation length, effective index and field distribution and directly evaluate the relative coupling efficiencies for various couplers configurations. We report 26- and 15-fold improvements in the coupling efficiency with two serially connected dipole and modified bow-tie antennas, respectively, as compared to that of the short-circuited waveguide termination.

References in corpus (4)

• Impedance matching and emission properties of optical antennas in a nanophotonic circuit
• Functional plasmonic nano-circuits with low insertion and propagation losses
• Experimental cross-polarization detection of coupling far-field light to highly confined plasmonic gap modes via nanoantennas
• Nanocouplers for infrared and visible light

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• Mono-crystalline Gold Platelets: A High Quality Platform for Surface Plasmon Polaritons
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• Interferometric near-field characterization of plasmonic slot waveguides in single- and poly-crystalline gold films
• Experimental Investigation of Stub Resonators Built in Plasmonic Slot Waveguides