Publications de Sergejs Boroviks

Publications associées (21)

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

Low-Loss Anisotropic Image Polaritons in van der Waals Crystal alpha-MoO3

Sergejs Boroviks

Orthorhombic molybdenum trioxide (alpha-MoO3), a newly discovered polaritonic van der Waals crystal, is attracting significant attention due to its strongly anisotropic mid-infrared phonon-polaritons. At the same time, coupling of polariton with its mirror ...

WILEY-V C H VERLAG GMBH2022

Extremely confined gap plasmon modes: when nonlocality matters

Sergejs Boroviks

Historically, the field of plasmonics has been relying on the framework of classical electrodynamics, with the local-response approximation of material response being applied even when dealing with nanoscale metallic structures. However, when the confineme ...

Nature Portfolio2022

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

Photon superbunching in cathodoluminescence of excitons in WS2 monolayer

Sergejs Boroviks

Cathodoluminescence spectroscopy in conjunction with second-order auto-correlation measurements of g(2)(tau) allows to extensively study the synchronization of photon emitters in low-dimensional structures. Co-existing excitons in two-dimensional transitio ...

IOP Publishing Ltd2023

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

Near-field probing of image phonon-polaritons in hexagonal boron nitride on gold crystals

Sergejs Boroviks

Near-field mapping has been widely used to study hyperbolic phonon-polaritons in van der Waals crystals. However, an accurate measurement of the polaritonic loss remains challenging because of the inherent complexity of the near-field signal and the substr ...

AMER ASSOC ADVANCEMENT SCIENCE2022

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

Nonlinear plasmonics with monocrystalline gold

Sergejs Boroviks

Plasmonic nanostructures allow to controllably enhance linear and nonlinear light-matter interactions by concentrating the electromagnetic fields at the scales below the diffraction limit. This feature is highly desired for many applications, e.g. bio- and ...

2021

Ultimate Limit for Optical Losses in Gold, Revealed by Quantitative Near-Field Microscopy

Sergejs Boroviks

We report thorough measurements of surface plasmon polaritons (SPPs) running along nearly perfect air-gold interfaces formed by atomically flat surfaces of chemically synthesized gold monocrystals. By means of amplitude-and phase-resolved near-field micros ...

AMER CHEMICAL SOC2022

Nonlinear Photoluminescence in Gold Thin Films

Sergejs Boroviks

Promisingapplications in photonics are driven by the ability tofabricate crystal-quality metal thin films of controlled thicknessdown to a few nanometers. In particular, these materials exhibit ahighly nonlinear response to optical fields owing to the indu ...

AMER CHEMICAL SOC2023

Demonstration of a Plasmonic Nonlinear Pseudodiode

Olivier Martin, Karim Achouri, Andrei Kiselev, Sergejs Boroviks

We demonstrate a nonlinear plasmonic metasurface that exhibits strongly asymmetric second-harmonic generation: nonlinear scattering is efficient upon excitation in one direction, and it is substantially suppressed when the excitation direction is reversed, ...

AMER CHEMICAL SOC2023

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

Monocrystalline Gold Metasurface to Control Anisotropic Second-Harmonic Generation

Olivier Martin, Sergejs Boroviks

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

Augmenting intrinsic second-order nonlinear response of monocrystalline gold with plasmon resonances

Olivier Martin, Giulia Tagliabue, Sergejs Boroviks, Fateme Kiani Shahvandi

2023

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

Ilia Lykov, Olivier Martin, Sergejs Boroviks, Siarhei Zavatski

2025

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

Engineering fluorescence with bound states in the continuum

Olivier Martin, Sergejs Boroviks

2025

Bianisotropic metasurface for asymmetric second-sarmonic generation: a nonlinear plasmonic pseudo-diode

Olivier Martin, Karim Achouri, Andrei Kiselev, Sergejs Boroviks

2023