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arXiv · 1908.11552

Modular Hybrid Plasmonic Integrated Circuit -- Rotation, Nanofocusing and Nonlinear Enhancement

Alessandro Tuniz·Oliver Bickerton·Fernando J. Diaz·Thomas Käsebier·Ernst-Bernhard Kley·Stefanie Kroker·Stefano Palomba·C. Martijn de Sterke
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Abstract

We introduce a modular approach for efficiently interfacing photonic integrated circuits with deep-sub-wavelength hybrid plasmonic functionality. We demonstrate that an off-the-shelf silicon-on-insulator waveguide can be post-processed into an integrated hybrid plasmonic circuit by evaporating a silica and gold nanolayer. The circuit consists of a plasmonic rotator and a nanofocusser module, which together result in nano-scale, nonlinear wavelength conversion. We experimentally characterize each module, and demonstrate an intensity enhancement of $>200$ in a calculated mode area of $50\,{\rm nm}^2$ at $\lambda = 1320\,{\rm nm}$ using second harmonic generation. This work opens the door to customized plasmonic functionalities on industry-standard waveguides, bridging conventional integrated photonic circuits with hybrid plasmonic devices. This approach promises convenient access to nanometre-scale quantum information processing, nonlinear plasmonics, and single-molecule sensing.

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Alessandro Tuniz, Oliver Bickerton, Fernando J. Diaz, Thomas Käsebier, Ernst-Bernhard Kley, Stefanie Kroker, Stefano Palomba, C. Martijn de Sterke. 2019-08-30. Modular Hybrid Plasmonic Integrated Circuit -- Rotation, Nanofocusing and Nonlinear Enhancement. https://doi.org/10.1038/s41467-020-16190-z

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