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Unidirectional wave propagation in nonreciprocal structures enables excitingopportunities to control and enhance wave-matter interactions in extreme ways.Within this context, here we investigate the possibility of using terminatedunidirectional plasmonic waveguides to enhance typically weak nonlinear effectsby orders of magnitude. We theoretically demonstrate remarkable levels ofelectric field enhancement and confinement (field hot-spots) when theunidirectional waveguiding structure is terminated with a suitable boundarythat fully stops the one-way mode. Such a large field enhancement, originatingfrom a nonresonant effect, is fundamentally different from the narrow-bandfield concentration effects in resonant plasmonic structures. Instead, it isanalogous to the broadband response of plasmonic tapers, but without the needfor any adiabatic impedance matching. We show that this effect can indeed leadto a substantial boosting of nonlinear light-matter interactions, exemplifiedby an improvement of several orders of magnitude in thethird-harmonic-generation efficiency, which is of large significance forseveral applications. More broadly, our findings show the potential of extremenonreciprocal configurations for enhanced wave-matter interactions.

Broadband field enhancement and giant nonlinear effects in terminated unidirectional plasmonic waveguides