Publications by Gabriel David Bernasconi

Modes interplay controls the second harmonic generation dynamics of plasmonic nanostructures

Olivier Martin, Gabriel David Bernasconi, Andrei Kiselev

A large amount of experimental and theoretical works deals with the second harmonic generation from different plasmonic geometries. Since they often consider relatively long optical pulses, many of these studies are focused on the investigation of a quasi- ...

SPIE2020

Electronic Structure-Dependent Surface Plasmon Resonance in Single Au-Fe Nanoalloys

Olivier Martin, Duncan Thomas Lindsay Alexander, Gabriel David Bernasconi, Jérémy Butet

The relationship between composition and plasmonic properties in noble metal nanoalloys is still largely unexplored. Yet, nanoalloys of noble metals, such as gold, with transition elements, such as iron, have unique properties and a number of potential app ...

2019

Modes interplay and dynamics in the second harmonic generation of plasmonic nanostructures

Olivier Martin, Gabriel David Bernasconi, Andrei Kiselev

The full wave surface integral equation computation of the second harmonic generation (SHG) dynamics for metal spheres and nanorods - presented as multimedia files - is performed to reveal the dynamics of the modes supported by the nanostructure. We demons ...

2019

Eigenmode Analysis in Plasmonics: Application to Second Harmonic Generation and Electron Energy Loss Spectroscopy

Gabriel David Bernasconi

Eigenmodes are central to the study of resonant phenomena in all areas of physics. However, their use in nano-optics seems to have been hindered and delayed for various reasons. First, due to their small size, the response of nanostructures to a far-field ...

EPFL2019

Modes interplay in the second harmonic generation dynamics of plasmonic nanoparticles

Olivier Martin, Gabriel David Bernasconi

2019

Strong second-harmonic generation from Au-Al heterodimers

Olivier Martin, Gabriel David Bernasconi, Jérémy Butet

Second-harmonic generation (SHG) is investigated from three kinds of lithographically fabricated plasmonic systems: Al monomers, Au monomers and Au-Al heterodimers with nanogaps of 20 nm. Spectrally integrated SHG intensities and the linear optical respons ...

2019

Homogenization and Scattering Analysis of Second-Order Nonlinear Metasurfaces

Olivier Martin, Karim Achouri, Gabriel David Bernasconi, Jérémy Butet

We present an extensive discussion on the homogenization and scattering analysis of second-order nonlinear metasurfaces. We use the generalized sheet transition conditions (GSTCs) in the frequency-domain to model the electromagnetic responses of nonlinear ...

IEEE2018

Modes interplay in the second harmonic generation dynamics of plasmonic nanoparticles

Olivier Martin, Gabriel David Bernasconi, Jérémy Butet

2018

Dynamics of Second-Harmonic Generation in a Plasmonic Silver Nanorod

Olivier Martin, Gabriel David Bernasconi, Jérémy Butet

2018

Homogenization and Scattering Analysis of Second-Harmonic Generation in Nonlinear Metasurfaces

Olivier Martin, Karim Achouri, Gabriel David Bernasconi, Jérémy Butet

We propose an extensive discussion on the homogenization and scattering analysis of the second-order nonlinear metasurfaces. Our developments are based on the generalized sheet transition conditions (GSTCs) that are used to model the electromagnetic respon ...

2018

Designing the magnetic second harmonic emission from plasmonic nanostructures

Olivier Martin, Karim Achouri, Gabriel David Bernasconi, Jérémy Butet

2018

Second Harmonic Generation Dynamics in Plasmonic Nanoparticles

Olivier Martin, Gabriel David Bernasconi, Jérémy Butet

Due to its symmetry properties, second-harmonic generation in plasmonic nanostructures enables the observation of even-parity modes that couple weakly to the far field. Consequentially, those modes radiate less and thus have a longer lifetime. Using a full ...

SPIE-INT SOC OPTICAL ENGINEERING2018

Silencing the second harmonic generation from plasmonic nanodimers: A comprehensive discussion

Olivier Martin, Gabriel David Bernasconi, Jérémy Butet

The silencing of the second harmonic generation process from plasmonic nanostructures corresponds to the limited far-field second harmonic radiation despite the huge fundamental electric field enhancement in the interstice between two plasmonic nanoparticl ...

BEILSTEIN-INSTITUT2018

Where Does Energy Go in Electron Energy Loss Spectroscopy of Nanostructures?

Jürgen Brugger, Olivier Martin, Valentin Flauraud, Duncan Thomas Lindsay Alexander, Gabriel David Bernasconi, Jérémy Butet

Electron energy loss spectroscopy is a method of choice for the characterization of both the spatial and spectral properties of localized surface plasmon resonances. The energy lost by the impinging electrons is commonly explained by the Lorentz force acti ...

2017

Mode Evolution in Strongly Coupled Plasmonic Dolmens Fabricated by Templated Assembly

Jürgen Brugger, Olivier Martin, Valentin Flauraud, Duncan Thomas Lindsay Alexander, Massimo Mastrangeli, Gabriel David Bernasconi, Jérémy Butet

Plasmonic antennas have enabled a wealth of applications that exploit tailored near-fields and radiative properties, further endowed by the bespoke interactions of multiple resonant building blocks. Specifically, when the interparticle distances are reduce ...

2017

Optical second harmonic generation from nanostructured graphene: a full wave approach

Olivier Martin, Gabriel David Bernasconi, Raziman Thottungal Valapu, Jérémy Butet, Bruno Majérus

Optical second harmonic generation (SHG) from nanostructured graphene has been studied in the framework of classical electromagnetism using a surface integral equation method. Single disks and dimers are considered, demonstrating that the nonlinear convers ...

2017

Mode Coupling in Plasmonic Heterodimers Probed with Electron Energy Loss Spectroscopy

Jürgen Brugger, Olivier Martin, Valentin Flauraud, Duncan Thomas Lindsay Alexander, Gabriel David Bernasconi, Jérémy Butet

While plasmonic antennas composed of building blocks made of the same material have been thoroughly studied, recent investigations have highlighted the unique opportunities enabled by making compositionally asymmetric plasmonic systems. So far, mainly hete ...

American Chemical Society2017

Self-Similarity of Plasmon Edge Modes on Koch Fractal Antennas

Olivier Martin, Gabriel David Bernasconi, Jérémy Butet

We investigate the plasmonic behavior of Koch snowflake fractal geometries and their possible application as broadband optical antennas. Lithographically defined planar silver Koch fractal antennas were fabricated and characterized with high spatial and sp ...

2017

Revealing a Mode Interplay That Controls Second-Harmonic Radiation in Gold Nanoantennas

Olivier Martin, Chen Yan, Gabriel David Bernasconi, Jérémy Butet

In this work, we investigate the generation of second- harmonic light by gold nanorods and demonstrate that the collected nonlinear intensity depends upon a phase interplay between di ff erent modes available in the nanostructure. By recording the backward ...

2017

Enhancement Mechanisms of the Second Harmonic Generation from Double Resonant Aluminum Nanostructures

Olivier Martin, Chen Yan, Gabriel David Bernasconi, Jérémy Butet, Kuang-Yu Yang

2017