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Giant nonlinear response at a plasmonic nanofocus drives efficient four-wave mixing over micron length scales (Conference Presentation)

Paper Abstract

Efficient optical frequency mixing typically must accumulate over large interaction lengths because nonlinear responses in natural materials are inherently weak. This limits the efficiency of mixing processes owing to the requirement of phase matching. Here, we report efficient four-wave mixing (FWM) over micrometer-scale interaction lengths at telecommunications wavelengths on silicon. We used an integrated plasmonic gap waveguide that strongly confines light within a nonlinear organic polymer. The gap waveguide intensifies light by nanofocusing it to a mode cross-section of a few tens of nanometers, thus generating a nonlinear response so strong that efficient FWM accumulates over wavelength-scale distances. This technique opens up nonlinear optics to a regime of relaxed phase matching, with the possibility of compact, broadband, and efficient frequency mixing integrated with silicon photonics.

Paper Details

Date Published: 4 March 2019
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Proc. SPIE 10922, Smart Photonic and Optoelectronic Integrated Circuits XXI, 109220D (4 March 2019); doi: 10.1117/12.2511459
Show Author Affiliations
Rupert F. Oulton, Imperial College London (United Kingdom)
Michael P. Nielsen, Imperial College London (United Kingdom)
Paul Dichtl, Imperial College London (United Kingdom)
Xingyuan Shi, Imperial College London (United Kingdom)
Stefan A Maier, Imperial College London (United Kingdom)


Published in SPIE Proceedings Vol. 10922:
Smart Photonic and Optoelectronic Integrated Circuits XXI
Sailing He; El-Hang Lee, Editor(s)

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