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

Abstract

The original Kerker effect was introduced for a hypothetical magnetic sphere, and initially it did not attract much attention due to a lack of magnetic materials required. Rejuvenated by the recent explosive development of the field of metamaterials and especially its core concept of optically-induced artificial magnetism, the Kerker effect has gained an unprecedented impetus and rapidly pervaded different branches of nanophotonics. At the same time, the concept behind the effect itself has also been significantly expanded and generalized. Here we review the physics and various manifestations of the generalized Kerker effects, including the progress in the emerging field of meta-optics that focuses on interferences of electromagnetic multipoles of different orders and origins. We discuss not only the scattering by individual particles and particle clusters, but also the manipulation of reflection, transmission, diffraction, and absorption for metalattices and metasurfaces, revealing how various optical phenomena observed recently are all ubiquitously related to the Kerker's concept.

Generalized Kerker effects in nanophotonics and meta-optics [Invited]

“…As already mentioned, the original Kerker effect was introduced for a single magnetic sphere in free space with an incident plane wave [1]. It has been greatly generalized, not only to various nonmagnetic particles of different shapes [7,10,[12][13][14], but also to other engineered incident waves [40][41][42][43][44][45][46][47], with the effects of substrates also studied in detail for practical applications [48][49][50][51][52]. Figure 2 includes three experimental studies on efficient beam steering based on interferences of multipoles excited with individual particles [43, 53,54].…”

Highly-Efficient Longitudinal Second-Harmonic Generation from Doubly-Resonant AlGaAs Nanoantennas

“…It is worth mentioning that the nanodisc supports other modes around the SH wavelength of 775 nm besides Mode B. These modes are not excited under normal plane wave incidence, while they can be excited under proper pump irradiation conditions, for example using special vector beam irradiation, which has large spatial overlap between the electric fields of the pump beam and the resonator mode [37,38]. In the following, we will focus on exploring the SHG process in the vicinity of the above-mentioned Mode A (near the pump wavelength) and Mode B (near the harmonic wavelength) to achieve doubly-resonant normal SH emission in AlGaAs nanoantennas.…”

Optomechanics of Chiral Dielectric Metasurfaces

“…The main peculiarity of our device resides instead in the use of a chiral pattern, with the consequent possibility to enable polarization‐dependent optomechanical effects; moreover, as highlighted above, the choice of a dielectric material (GaAs) allows for almost lossless operation. GaAs has also other advantages: it is easily machinable, it can host active elements, and it has strong nonlinear optical response . Furthermore, being its refractive index similar to that of silicon, the design presented here can be straightforwardly exported to complementary metal‐oxide‐semiconductor (CMOS)‐compatible platforms for eventual integrability with electronics.…”