Gonzague Agez

Emergence of Localized Surface Plasmons in Unpatterned Hyperdoped Polycrystalline Silicon

Mohamad Bahsoun, J. Groenen, Gonzague Agez, S. Joulié et autres

The ability to engineer localized surface plasmon resonances at large scale usually relies on precise nanoscale patterning. Here, we demonstrate that mid-infrared plasmonic responses can instead emerge in unpatterned polysilicon films composed of nanometric (5-50 nm) grains, challenging established design paradigms and …

fr (code pays fourni par la source)

( Invited ) Dielectric Mie Nanostructures and Metasurfaces for Quantum Emitter Control

A. Azéma, Swaroop Palai, Jonas Müller, Étienne Palleau et autres

Improving the brightness and efficiency of single photon sources by the mean of optically resonant nanostructures is a major stake for the development of efficient nanodevices for quantum communications. For a couple of decades, these resonant nanostructures have mainly been made of …

fr (code pays fourni par la source)

Room temperature valley coherence in monolayer WSe2 mediated by chiral nematic liquid crystal

Hassan Lamsaadi, Andrea Balocchi, Aurélien Cuche, Hugo Lourenço Martins et autres

Valley coherence refers to a phase-coherent superposition of inequivalent momentum valleys, in which quantum information can be encoded in the relative valley phase. Chiral nematic liquid crystals, by imposing a flip of the spin angular momentum upon light reflection, provide an effective …

Room temperature valley coherence in monolayer WSe2 mediated by chiral nematic liquid crystal

Hassan Lamsaadi, Andrea Balocchi, Aurélien Cuche, Hugo Lourenço Martins et autres

Valley coherence refers to a phase-coherent superposition of inequivalent momentum valleys, in which quantum information can be encoded in the relative valley phase. Chiral nematic liquid crystals, by imposing a flip of the spin angular momentum upon light reflection, provide an effective …

fr (code pays fourni par la source)

Emergence of Localized Surface Plasmons in Unpatterned Hyperdoped Polycrystalline Silicon

Mohamad Bahsoun, J. Groenen, Gonzague Agez, S. Joulié et autres

The ability to engineer localized surface plasmon resonances at large scale usually relies on precise nanoscale patterning. Here, we demonstrate that mid-infrared plasmonic responses can instead emerge in unpatterned polysilicon films composed of nanometric (5-50 nm) grains, challenging established design paradigms and …

Emergence of Localized Surface Plasmons in Unpatterned Hyperdoped Polycrystalline Silicon

Mohamad Bahsoun, J. Groenen, Gonzague Agez, S. Joulié et autres

The ability to engineer localized surface plasmon resonances at large scale usually relies on precise nanoscale patterning. Here, we demonstrate that mid-infrared plasmonic responses can instead emerge in unpatterned polysilicon films composed of nanometric (5-50 nm) grains, challenging established design paradigms and …

Decoding ladybird’s colours: Structural mechanisms of colour production and pigment modulation

M. Carrada, Mohamed Haddad, Luis M. San‐Jose, Gonzague Agez et autres

This study investigates the mechanisms underlying colour production in the family Coccinellidae, focusing on two model species: Adalia bipunctata (L.) and Calvia quatuordecimguttata (L.). In this family, colours have traditionally been attributed primarily to pigments such as carotenoids and melanins. We propose …

fr (code pays fourni par la source)

Decoding ladybird’s colours: structural mechanisms of colour production and pigment modulation

M. Carrada, Mohamed Haddad, Luis M. San‐Jose, Gonzague Agez et autres

Abstract This study investigates the mechanisms underlying colour production in the family Coccinellidae, focusing on two model species: A. bipunctata (L) and C. quatuordecimguttata (L) . In this family, colours have traditionally been attributed primarily to pigments such as carotenoids and melanins. …

fr, Maroc (code pays fourni par la source)

Exciton Collimation, Focusing and Trapping Using Complex Transition Metal Dichalcogenide Lateral Heterojunctions

Hassan Lamsaadi, Aurélien Cuche, Gonzague Agez, Ioannis Paradisanos et autres

Abstract Controlling the motion of neutral excitons in optically active media is a mandatory development to enable the conception of advanced circuits and devices for applications in excitronics, quantum photonics, and optoelectronics. Recently, proof of unidirectional exciton transport from high‐ to low‐bandgap …

fr, gr, de, jp (code pays fourni par la source)

2D exciton lensing: collimation, focusing and trapping

Jean‐Marie Poumirol, Hassan Lamsaadi, Aurélien Cuche, Gonzague Agez et autres

fr, de, jp, ua (code pays fourni par la source)

Directional silicon nano-antennas for quantum emitter control designed by evolutionary optimization

Romain Hernandez, Peter R. Wiecha, Jean‐Marie Poumirol, Gonzague Agez et autres

We optimize silicon nano-antennas to enhance and direct the emission of local quantum sources. We combine global evolutionary optimization (EO) with frequency domain electrodynamical simulations and compare design strategies based on resonant and non-resonant building blocks. Specifically, we investigate the performance of …

fr (code pays fourni par la source)

Control of light emission of quantum emitters coupled to silicon nanoantenna using cylindrical vector beams

Martin Montagnac, Yoann Brûlé, Aurélien Cuche, Jean‐Marie Poumirol et autres

Abstract Light emission of europium (Eu3+) ions placed in the vicinity of optically resonant nanoantennas is usually controlled by tailoring the local density of photon states (LDOS). We show that the polarization and shape of the excitation beam can also be used …

fr, it (code pays fourni par la source)