Third-harmonic generation from Mie-type resonances of isolated all-dielectric nanoparticles

Subwavelength silicon nanoparticles are known to support strongly localized Mie-type modes, including those with resonant electric and magnetic dipolar polarizabilities. Here we compare experimentally the efficiency of the third-harmonic generation from isolated silicon nanodiscs for resonant excitation at the two types of dipolar resonances. Using nonlinear spectroscopy, we observe that the magnetic dipolar mode yields more efficient third-harmonic radiation in contrast to the electric dipolar (ED) mode. This is further supported by full-wave numerical simulations, where the volume-integrated local fields and the directly simulated nonlinear response are shown to be negligible at the ED resonance compared with the magnetic one.The authors acknowledge financial support from Russian Foundation for Basic Research (grant nos. 16-29-11811 and 16-02-01092) and the Australian Research Council

Nonlinear anisotropy in silicon nanoparticle oligomers

In this work, we demonstrate experimentally and numerically an anisotropic nonlinear optical response from silicon nanoparticle oligomers. By monitoring the third-harmonic generation from symmetric silicon nanodisk trimers as a function of the linear pump polarization orientation, we observe considerable variations in the nonlinear signal stemming from the polarization sensitivity of the local field profiles, which otherwise play no role in the symmetry of the nanostructure linear response.The authors acknowledge the support by the Russian Ministry of Education and Science (#14.W03.31.0008), the Russian Foundation for Basic Research (#16-29-11811), and the Australian Research Council

Third-harmonic spectroscopy of all-dielectric oligomers with both electric and magnetic resonances

We characterize experimentally the nonlinear optical response of silicon nanodisk oligomers using third-harmonic generation spectroscopy and reveal the contributions of magnetic and electric dipolar resonances, local field enhancement, and nonlinear interference

Selective Third-Harmonic Generation by Structured Light in Mie-Resonant Nanoparticles

We study the third-harmonic generation by structured light in subwavelength silicon nanoparticles which support both electric and magnetic multipolar Mie resonances. By tailoring the vectorial structure of the pumping light, we may control both strength and polarization composition of the excited harmonic fields. In this way, we generate nonlinear fields with radial or azimuthal polarizations by addressing selectively a different type of multipolar Mie resonances, also enhancing or suppressing the optically induced nonlinear magnetic response.E.M.G. acknowledges the funding from the Student Mobility Scholarship of the President of the Russian Federation. R.C.M. acknowledges a grant from Consejo Nacional de Ciencia y Tecnologia (CONACYT), Me ́ xico. ́ The authors acknowledge a support of the Australian Research Council (ARC) and the Russian Ministry of Education and Science (#14.W03.31.0008)

Structured Light for Selective Third-Harmonic Generation in Subwavelength Resonators

We study the third-harmonic generation in subwavelength silicon particles supporting Mie-type optical modes. By tailoring the vectorial structure of the pumping light, we selectively excite electric or magnetic multipoles, also controlling the induced nonlinear response

Nonlinear interference and tailorable third-harmonic generation from dielectric oligomers

It is known that the nonlinear optical properties of photonic nanostructures can be modified substantially due to strong field confinement and optical resonances. In this contribution, we study third-harmonic generation from low-loss subwavelength silicon nanodisks arranged in the form of trimer oligomers with varying distance between the nanoparticles. Each of the nanodisks exhibits both electric and magnetic Mie-type resonances that are shown to affect significantly the nonlinear response. We observe the third-harmonic radiation intensity that is comparable to that of a bulk silicon slab and demonstrate a pronounced reshaping of the third-harmonic spectra due to interference of the nonlinearly generated waves augmented by an interplay between the electric and the magnetic dipolar resonances

Nonlinear Interference and Tailorable Third-Harmonic Generation from Dielectric Oligomers

It is known that the nonlinear optical properties of photonic nanostructures can be modified substantially due to strong field confinement and optical resonances. In this contribution, we study third-harmonic generation from low-loss subwavelength silicon nanodisks arranged in the form of trimer oligomers with varying distance between the nanoparticles. Each of the nanodisks exhibits both electric and magnetic Mie-type resonances that are shown to affect significantly the nonlinear response. We observe the third-harmonic radiation intensity that is comparable to that of a bulk silicon slab and demonstrate a pronounced reshaping of the third-harmonic spectra due to interference of the nonlinearly generated waves augmented by an interplay between the electric and the magnetic dipolar resonances