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Abstract
An all-dielectric nanoantenna is expected to greatly boost the nonlinear performance owing to its large mode volume and low material loss. However, it still suffers from the relatively weak near-field enhancement and the inferior far-field directivity. In this work, by successively introducing an upper metal ring and a bottom metal film, the plasmonic resonance and the perfect electric conductor (PEC) mirror effect are employed to significantly enhance and tailor the third harmonic generation (THG) from the high-index silicon nanoantenna. Numerical results show that benefiting from both of these two metal components, not only the THG efficiency is increased by more than 1 and 3.5 orders of magnitude compared with those with only single metal component and without any metal component, respectively, but also an improved radiation directivity can be obtained. The dependences of geometric parameters are discussed as well. This work suggests a route to enhance and manipulate the nonlinear radiation by a hybrid nanoantenna and facilitates its practical applications such as biosensing and nonlinear light sources.
Highlights
T HE combination of nanotechnology and near-field optics has led to the emergence of a new discipline, nanophotonics, in the high-tech field
Benefiting from both the plasmonic resonance and the perfect electric conductor (PEC) mirror effect by these two metal components, the electric field inside silicon is greatly enhanced with a maximum enhancement factor |Emax/Einc| = 11, more than 5 times as large as that of resonator on insulator (RI) structure in Fig. 3(a), which promises a preeminent nonlinear performance
In order to fully explore the effect of the double metal components on the third harmonic generation (THG) efficiency, the influence of inner radius r1 and outer radius r2 of the Au ring in the a resonator on metal (ARM) structure is where I0 is the pump intensity, S is the Poynting vector of the third harmonic (TH) field, and n is the unit vector normal to a surface A enclosing the silicon nanoparticle
Summary
T HE combination of nanotechnology and near-field optics has led to the emergence of a new discipline, nanophotonics, in the high-tech field. Nanoantennas and nanoparticles made from high-refractive-index dielectrics have been reported to enlarge the mode volume, reduce the loss, and boost the nonlinear performance of the optical systems [13]–[15]. These high-refractive-index dielectrics allow low losses and strong near field enhancements due to the presence of electric and magnetic multipole modes [16], [17]. We propose a metal-dielectric hybrid nanoantenna with a THG efficiency 5.7 × 10−4 under pump intensity I0 = 0.5 GW/cm and a tailored nonlinear far-field scattering. By optimizing the geometric parameters, the nonlinear radiation patterns are tailored, achieving a preeminent directivity performance
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