Second-harmonic generation in plasmonic waveguides with nonlocal response and electron spill-out

Abstract

Plasmonic waveguides provide an integrated platform to develop efficient nanoscale ultrafast photonic devices. Theoretical models that describe nonlinear optical phenomena in plasmonic waveguides, usually, only incorporate bulk nonlinearities, while nonlinearities that arise from metallic constituents remained unexplored. In this work, we present a method that enables a generalized treatment of the nonlinearities present in plasmonic waveguides and use it to calculate second-harmonic generation from free electrons through a hydrodynamic nonlocal description. As a general application of our method we also consider nonlinearities arising from the quantum hydrodynamic theory with electron spill-out. Our results may find applicability in design and analysis of integrated photonic platforms for nonlinear optics incorporating wide variety of nonlinear materials such as heavily doped semiconductors for mid-infrared applications.

References in corpus (6)

• Entanglement of two qubits mediated by one-dimensional plasmonic waveguides
• Revisiting the boundary conditions for second-harmonic generation at metal-dielectric interfaces
• Free electron nonlinearities in heavily doped semiconductors plasmonics
• Enhancing second-harmonic generation with electron spill-out at metallic surfaces
• A nested hybridizable discontinuous Galerkin method for computing second-harmonic generation in three-dimensional metallic nanostructures
• Second-harmonic generation from singular metasurfaces

Cited by in corpus (1)

• Impact of surface charge depletion on the free electron nonlinear response of heavily doped semiconductors