Publications de Valentin Flauraud

Near-Field Mapping of Photonic Eigenmodes in Patterned Silicon Nanocavities by Electron Energy-Loss Spectroscopy

Valentin Flauraud, Duncan Thomas Lindsay Alexander

Recently, there has been significant interest in using dielectric nanocavities for the controlled scattering of light, owing to the diverse electromagnetic modes that they support. For plasmonic systems, electron energy-loss spectroscopy (EELS) is now an e ...

2021

Level-line moirés by superposition of cylindrical microlens gratings

Roger Hersch, Jürgen Brugger, Valentin Flauraud, Théophane Besson, Thomas Walger

Two superposed layers of transparent cylindrical lenslet gratings create classical moiré fringes when illuminated from behind. We rely on this observation to conceive special devices made of superposed lenslet gratings that produce compelling beating shape ...

2020

Planar plasmonic antenna arrays resolve transient nanoscopic heterogeneities in biological membranes

Jürgen Brugger, Valentin Flauraud, Raju Regmi

SPRINGER2019

1D moiré shapes by superposed layers of micro-lenses

Roger Hersch, Jürgen Brugger, Valentin Flauraud, Théophane Besson, Thomas Walger

Two superposed layers of transparent cylindrical lenslet gratings create classical moiré fringes, when illuminated from behind. We rely on this observation to conceive special devices made of superposed lenslet gratings that produce animated moirés when th ...

2019

Growth of Large-Area 2D MoS2 Arrays at Pre-Defined Locations Using Stencil Mask Lithography

Jürgen Brugger, Valentin Flauraud

2018

Unusually Long-Lived Photocharges in Helical Organic Semiconductor Nanostructures

Andrzej Sienkiewicz, Jürgen Brugger, Jan Cornelius Brauer, Valentin Flauraud, Holger Frauenrath, Liangfei Tian, Regina Judith Hafner, Thomas Schmaltz

Photocharge generation and formation of long-lived charge carriers are relevant in photosynthesis, photocatalysis, photovoltaics, and organic electronics. A better understanding of the factors that determine these processes in synthetic polymer semiconduct ...

AMER CHEMICAL SOC2018

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

In-Plane Plasmonic Antenna Arrays with Surface Nanogaps for Giant Fluorescence Enhancement

Jürgen Brugger, Valentin Flauraud, Duncan Thomas Lindsay Alexander, Raju Regmi, Pamina Winkler

Optical nanoantennas have a great potential for enhancing light-matter interactions at the nanometer scale, yet fabrication accuracy and lack of scalability currently limit ultimate antenna performance and applications. In most designs, the region of maxim ...

American Chemical Society (ACS)2017

Nanoscale topographical control of capillary assembly of nanoparticles

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

Predetermined and selective placement of nanoparticles onto large-area substrates with nanometre-scale precision is essential to harness the unique properties of nanoparticle assemblies, in particular for functional optical and electro-optical nanodevices. ...

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

Planar Optical Nanoantennas Resolve Cholesterol-Dependent Nanoscale Heterogeneities in the Plasma Membrane of Living Cells

Jürgen Brugger, Valentin Flauraud, Raju Regmi, Pamina Winkler

Optical nanoantennas can efficiently confine light into nanoscopic hotspots, enabling single-molecule detection sensitivity at biological relevant conditions. This innovative approach to breach the diffraction limit offers a versatile platform to investiga ...

2017

Transient Nanoscopic Phase Separation in Biological Lipid Membranes Resolved by Planar Plasmonic Antennas

Jürgen Brugger, Valentin Flauraud, Raju Regmi, Pamina Winkler

Nanoscale membrane assemblies of sphingolipids, cholesterol, and certain proteins, also known as lipid rafts, play a crucial role in facilitating a broad range of important cell functions. Whereas on living cell membranes lipid rafts have been postulated t ...

American Chemical Society2017

Growth Of Organic Semiconductor Thin Films with Multi-Micron Domain Size and Fabrication of Organic Transistors Using a Stencil Nanosieve

Jürgen Brugger, Valentin Flauraud, Shenqi Xie

To grow small molecule semiconductor thin films with domain size larger than modern-day device sizes, we evaporate the material through a dense array of small apertures, called a stencil nanosieve. The aperture size of 0.5 μm results in low nucleation dens ...

Amer Chemical Soc2017

Silicon nanostructures for bright field full color prints

Jürgen Brugger, Valentin Flauraud, Miguel Arnold Reyes

Nanoscale color printing has recently emerged as a unique alternative to traditional pigments by providing record spatial resolution, angular independent, durable and single material colors. Widely based on plasmonic nanostructures, numerous efforts in the ...

Amer Chemical Soc2017

Novel manufacturing methods for optical antennas : controlling light down to the single nanometer scale

Valentin Flauraud

The resonant excitation of free electrons in metallic nanostructures enables extreme near field intensities along with a deep sub-wavelength localization of the electromagnetic energy. This has been exploited to enhance light-matter interaction down to the ...

EPFL2017

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

Synthesis of superposition shape images by light interacting with layers of lenslets

Roger Hersch, Jürgen Brugger, Valentin Flauraud, Théophane Besson, Thomas Walger

The present invention describes methods and apparatuses for creating superposition shape images by superposed base and revealing layers of lenslet gratings. The superposition shape images form a message recognizable by a human observer or by an image acqui ...

2017

Electron Energy-Loss Spectroscopy of Coupled Plasmonic Systems: Beyond the Standard Electron Perspective

Jürgen Brugger, Olivier Martin, Valentin Flauraud, Gabriel David Bernasconi, Jérémy Butet

Electron energy-loss spectroscopy (EELS) has become an experimental method of choice for the investigation of localized surface plasmon resonances, allowing the simultaneous mapping of the associated field distributions and their resonant energies with a n ...

Spie-Int Soc Optical Engineering2016

Arrays of Pentacene Single Crystals by Stencil Evaporation

Jürgen Brugger, Valentin Flauraud, Shenqi Xie

In order to realize high-performance organic thin-film transistors (TFT), two parameters of the organic semiconducting layer are desired: single crystallinity for high mobility and patterning for low off currents. High-quality single crystals can be fabric ...

2016

Large-Area Gold/Parylene Plasmonic Nanostructures Fabricated by Direct Nanocutting

Christian Santschi, Jürgen Brugger, Olivier Martin, Benjamin Gallinet, Valentin Flauraud, Shourya Dutta Gupta, Vaida Auzelyte

Wiley-V C H Verlag Gmbh2013