Sum frequency generation from touching wires: A transformation optics approach

Abstract

We employ transformation optics to study analytically nonlinear wave mixing from a singular geometry of touching plasmonic wires. We obtain the analytic solution of the near-field and complement it with a solution of the far-field properties. We find, somewhat surprisingly, that optimal efficiency (in both regimes) is obtained for the degenerate case of the Second-harmonic generation. We exploit the analytic solution obtained to trace this behaviour to the spatial overlap of the input fields near the geometric singularity.

References in corpus (5)

• Origin of optical second-harmonic generation in spherical gold nanoparticles: Local surface and nonlocal bulk contributions
• Revisiting the boundary conditions for second-harmonic generation at metal-dielectric interfaces
• A transformation optics approach to singular metasurfaces
• Surface second-harmonic from metallic nanoparticle configurations - a transformation optics approach
• Optimization of second-harmonic generation from touching plasmonic wires