Person

Karim Achouri

The Art of Finding the Optimal Scattering Center(s) (Advanced Optical Materials 4/2025)

Wiley2025

Angle-invariant scattering in metasurfaces

Metasurfaces are efficient and versatile electromagnetic structures that have already enabled the implementation of a wide range of microwave and photonic wave shaping applications. Despite the extensive research into metasurfaces, a rigorous and comprehen ...

American Physical Society (APS)2025

A General Susceptibility‐Based Approach for Uniform Metasurface Scattering

Karim Achouri

The general approach in metasurface design is to find the unit‐cell properties required to achieve a given functionality. This is usually done by modeling the metasurface as a combination of surface electric and magnetic polarization densities, whose param ...

Wiley2025

T-matrix representation of optical scattering response: Suggestion for a data format

Karim Achouri

The transition matrix, frequently abbreviated as T-matrix, contains the complete information in a linear approximation of how a spatially localized object scatters an incident field. The T-matrix is used to study the scattering response of an isolated obje ...

2025

Optimal Poloidal Multipole Expansion Centres

Karim Achouri

Resonant optical response is one of the key effects in nanophotonic structures. The characterization of the fundamental resonance metrics, quality factor, electric or magnetic field localization, polarization, and chirality, is often built on a multipolar ...

IEEE Computer Society2024

Pulling force enabled by unlocking the optical phase

Olivier Martin, Karim Achouri, Andrei Kiselev, Siarhei Zavatski

We demonstrate the possibility of achieving an optical pulling force without complex beam-shaping techniques. By using optical pulses detuned from the resonant frequency of the structure, we create conditions in which the spectral maxima of the excited cur ...

Cambridge University Press (CUP)2024

Symmetry breaking of the angular transmittance by a metagrating

Olivier Martin, Karim Achouri

Metasurfaces have opened the way for gaining control over the frequency and the polarization responses of electromagnetic waves. However, it is still challenging to control their electromagnetic angular response. Here, the potential of diffractive surfaces ...

SPIE2024

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

Roadmap on photonic metasurfaces

Karim Achouri

Here we present a roadmap on Photonic metasurfaces. This document consists of a number of perspective articles on different applications, challenge areas or technologies underlying photonic metasurfaces. Each perspective will introduce the topic, present a ...

AIP American Institute of Physics2024

The Art of Finding the Optimal Scattering Center(s)

Karim Achouri

The truncated spatial multipolar spectra enable efficient approximate solutions to acoustic, quantum-mechanical, and electromagnetic problems. In photonics, the efficient multipole description of a general emitter or scatterer with controlled accuracy is c ...

WILEY-V C H VERLAG GMBH2024