Publications de Sergejs Boroviks

Monocrystalline Gold Metasurface to Control Anisotropic Second-Harmonic Generation

The tensorial nature of the nonlinear susceptibility of gold surfaces is revealed and exploited by comparing crystalline and polycrystalline thin films. The {111}-type surfaces of crystalline gold exhibit anisotropic features that are absent at the surface ...

WILEY-V C H VERLAG GMBH2025

Anisotropic nonlinearities in crystalline gold and how to exploit them

Olivier Martin, Sergejs Boroviks

We demonstrate a monocrystalline plasmonic metasurface which takes advantage of the anisotropic second-harmonic generation from 111-type gold surface. Furthermore, we provide a comprehensive description of this anisotropic nonlinearity that is rooted in th ...

2025

Selective enhancement and silencing of anisotropic nonlinearities at {111} gold surface

Olivier Martin, Sergejs Boroviks

Second-harmonic generation (SHG) and other second-order nonlinear processes do not occur in bulk gold due to its centrosymmetric crystal structure. However, the centrosymmetry is broken at the surface, giving rise to non-zero surface susceptibility tensor ...

2025

Influence of the plasmonic lattice Kerker effect on second-harmonic generation

Olivier Martin, Sergejs Boroviks

We study the Kerker effect associated with the excitation of multipolar surface lattice resonance and its influence on nonlinear optical response. Observing that appearance of the Kerker effect is associated the strong absorption, we show that it diminishe ...

2025

Symmetry-protected bound states in the continuum supported by single crystal silver gratings

Olivier Martin, Sergejs Boroviks, Siarhei Zavatski

2025

Engineering fluorescence with bound states in the continuum

Olivier Martin, Sergejs Boroviks

2025

Hybrid metasurfaces for light processing

Olivier Martin, Andrei Kiselev, Sergejs Boroviks

We explore the optical effects that result from the combination of two classes of materials: plasmonic metals with a dominant electric response - combined with high index dielectrics - with a magnetic response. Their interaction leads to complex spectral r ...

IEEE Computer Society2024

Bianisotropic metasurface enables a nonlinear pseudo-diode: asymmetric second-harmonic generation

Olivier Martin, Karim Achouri, Andrei Kiselev, Sergejs Boroviks

Bianisotropic metasurfaces empower planarized optical components with subwavelength thicknesses that are not amenable to conventional optics. In particular, bianisotropy gives control over the spatial dispersion and allows engineering of both spectral and ...

2024

Engineering quasi-bound states in the continuum in asymmetric waveguide gratings

Olivier Martin, Sergejs Boroviks

The occurrence of quasi-bound states in the continuum (qBIC) in all-dielectric asymmetric grating waveguide couplers with different degrees of asymmetry under normal light incidence is analysed from the viewpoint of identifying the most promising configura ...

2024

Fundamentals of Non-linear Optics in Nanostructures

Olivier Martin, Sergejs Boroviks

This chapter provides an overview of the formalism required to describe non-linear optical phenomena, including the non-linear wave equation and the different orders of susceptibilities, up to the third-order. Second- and third-order non-linear phenomena a ...

Royal Society of Chemistry2024