Modular nonlinear hybrid plasmonic circuit

Alessandro Tuniz (), Oliver Bickerton, Fernando J. Diaz, Thomas Käsebier, Ernst-Bernhard Kley, Stefanie Kroker, Stefano Palomba and C. Martijn de Sterke
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Alessandro Tuniz: The University of Sydney
Oliver Bickerton: The University of Sydney
Fernando J. Diaz: The University of Sydney
Thomas Käsebier: Friedrich Schiller Universität Jena
Ernst-Bernhard Kley: Friedrich Schiller Universität Jena
Stefanie Kroker: Physikalisch-Technische Bundesanstalt
Stefano Palomba: The University of Sydney
C. Martijn de Sterke: The University of Sydney

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Photonic integrated circuits (PICs) are revolutionizing nanotechnology, with far-reaching applications in telecommunications, molecular sensing, and quantum information. PIC designs rely on mature nanofabrication processes and readily available and optimised photonic components (gratings, splitters, couplers). Hybrid plasmonic elements can enhance PIC functionality (e.g., wavelength-scale polarization rotation, nanoscale optical volumes, and enhanced nonlinearities), but most PIC-compatible designs use single plasmonic elements, with more complex circuits typically requiring ab initio designs. Here we demonstrate a modular approach to post-processes off-the-shelf silicon-on-insulator (SOI) waveguides into hybrid plasmonic integrated circuits. These consist of a plasmonic rotator and a nanofocusser, which generate the second harmonic frequency of the incoming light. We characterize each component’s performance on the SOI waveguide, experimentally demonstrating intensity enhancements of more than 200 in an inferred mode area of 100 nm2, at a pump wavelength of 1320 nm. This modular approach to plasmonic circuitry makes the applications of this technology more practical.

Date: 2020
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DOI: 10.1038/s41467-020-16190-z

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