A5055131205- Gold and Silver Nanoparticles Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Photonic and Optical Devices
- Optical Coatings and Gratings
- Near-Field Optical Microscopy
- Advanced biosensing and bioanalysis techniques
- Physics of Superconductivity and Magnetism
- Nonlinear Optical Materials Studies
- Silicon Nanostructures and Photoluminescence
- Nanowire Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Nanofabrication and Lithography Techniques
- Orbital Angular Momentum in Optics
- Metamaterials and Metasurfaces Applications
- Laser-Ablation Synthesis of Nanoparticles
- Molecular Junctions and Nanostructures
- Photoacoustic and Ultrasonic Imaging
- Copper-based nanomaterials and applications
- Photopolymerization techniques and applications
- Carbon Nanotubes in Composites
- Magnetic properties of thin films
- Nanocluster Synthesis and Applications
- Electrohydrodynamics and Fluid Dynamics
- Thermal Radiation and Cooling Technologies
Université de Technologie de Troyes
2015-2024
Centre National de la Recherche Scientifique
2014-2024
Centre de Nanosciences et de Nanotechnologies
2018-2024
Light, nanomaterials, nanotechnologies
2018-2024
Canadian Nautical Research Society
2020
Centre Hospitalier de Troyes
2017
Laboratoire des Technologies de la Microélectronique
2014
Marie Curie
2012-2013
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2004-2011
Université de Bourgogne
2009
Following recent advances in nanoplasmonics related to high-temperature applications, hot-electron processes, nanochemistry, sensing, and active plasmonics, new materials have been introduced, reducing the supremacy of gold silver plasmonics. The variety possible is now so wide that selecting best material for a specific application at wavelength may become difficult task. In this context, we introduce Article two dimensionless parameters acting as figures merit simply compare plasmonic...
Lattice modes have been proposed as a means to engineer and control the linewidth spectral position of optical resonances in arrays metallic nanoparticles sustaining localized surface plasmon (LSP) resonances.Lattice are produced by interference LSP-enhanced in-plane scattered light, leading Fano-like lineshape with reduced linewidth.In this paper, we study lattice supported gold aluminium nanoparticle visible UV, both experimentally theoretically.The measured simulated dispersion curves...
Sensitivity is a key factor in the improvement of nanoparticle-based biosensors. Bowtie nanoantennae have shown high sensitivity for both surface-enhanced Raman scattering (SERS)- and localized surface plasmon resonance (LSPR)-based biosensing. In this work, optical bowtie with varying geometries were simulated, fabricated, characterized. We successfully fabricated sub-5 nm gaps between prisms. The gap prisms, prism size, radius curvature corners characterized their effects on...
We report on the emission of hybrid nanosources composed gold nanoparticles coupled with quantum dots. The relies energy transfer from dots to which could be de-excited through radiative plasmon relaxation. dependence efficiency is studied systematically as a function size and interdistance between demonstrate size-dependent transition quenching enhancement nonradiative nanoparticles.
Metal nitrides have been proposed to replace noble metals in plasmonics for some specific applications. In particular, while titanium nitride (TiN) and zirconium (ZrN) possess localized plasmon resonances very similar gold magnitude wavelength, they benefit from a much higher sustainability temperature. For this reason, are foreseen as ideal candidates applications nanoplasmonics that require high material temperature under operation, such heat assisted magnetic recording (HAMR) or...
Metallic nanostructures are the building blocks for nanoplasmonics and subsequent applications in nanooptics. For several decades, plasmonics have been almost exclusively studied visible region by using made of noble metals exhibiting plasmonic properties near infrared to range. This notwithstanding, emerging will require extension toward higher energies, particularly UV Therefore, alternative metals, often described as poor achieve that goal. Among all these aluminium appears be one most...
We report on the high resolution imaging of multipolar plasmonic resonances in aluminum nanoantennas using electron energy loss spectroscopy (EELS). Plasmonic ranging from near-infrared to ultraviolet (UV) are measured. The spatial distributions resonant modes mapped and their dispersion is retrieved. losses antennas studied through full width at half-maximum resonances, unveiling weight both interband radiative damping mechanisms different resonances. In blue-UV spectral range, order...
Light-induced isomerization processes in azobenzene-containing polymers produce mass transport that is of much interest for nanoscale imaging and lithography. Yet, despite the development numerous models to simulate mechanism, no model precisely describes all experimental observations. We develop a new statistical approach correctly reproduces light-driven motion with high degree accuracy. Comparisons experiments show our predicts topographic modifications many different incident field...
We report on a straightforward preparation method to obtain dense layer of quasi-spherical aluminum nanoparticles over large area. The is based rapid thermal annealing thin film deposited super-repellent substrate. Diameters ranging from 2 15 nm are obtained by varying the thickness. Aluminum exhibit well-defined localized surface plasmon resonances in ultraviolet range as revealed extinction measurements and confirmed Mie theory.
We report a near-field imaging study of colloidal gold nanocubes. This is accomplished through photochemical method in which molecular displacements are vectorial nature, enabling sensitivity to the polarization optical analyze confinement both electromagnetic hot and "cold" spots with resolution λ/35 emphasize particularly high spatial cold spots. The concept spot complements well-known but can have significant advantages. application ultraconfined spectroscopy discussed.
We use electron energy loss spectroscopy (EELS) to perform a comprehensive and mapping of the plasmonic modes sustained by aluminum nanotriangles. Behind apparent simplicity such structures, rich variety is observed. Edge pseudoradial breathing (pseudo-RBMs) are unveiled as they couple efficiently with source. propose analytical models confirmed rigorous simulations index both families describe their spatial symmetry. could be indexed nanoantenna modes, while pseudo-RBMs match triangular...
This Article interrogates the mechanisms responsible for nanoscale photopolymerization induced by confined and enhanced electromagnetic fields. Surface plasmon dipolar resonance of individual Ag nanoparticles was used as an optical near-field source to locally trigger reaction a photopolymerizable formulation. Laser excitation embedded in formulation reproducibly generates polymer features with typical dimensions ranging from 2 nm few tens nanometer. We have determined physicochemical...
Plasmonic nanostructures are being exploited for optical and photovoltaic applications, particularly where field enhancement of processes is desirable. Extensive work has focused on the optimization plasmonic near-fields by geometric tuning interparticle coupling, but size tunability received less attention. We used single-nanoparticle photochemical imaging to characterize near-field intensity around a nanoparticle as function size. The measured increases with size, reaching maximum at 50...
When circularly polarized light interacts with a nanostructure, the optical response depends on geometry of structure. If nanostructure is chiral (i.e., it cannot be superimposed its mirror image), then response, both in near-field and far-field, handedness incident light. In contrast, achiral structures exhibit identical far-field responses for left- right-circular polarization. Here, we show that perfectly plasmonic metamolecule trigonal D3h symmetry, exhibits sensitive to This effect...
Abstract Hybrid plasmonic nano-emitters based on the combination of quantum dot emitters (QD) and nanoantennas open up new perspectives in control light. However, precise positioning any active medium at nanoscale constitutes a challenge. Here, we report optimal overlap antenna’s near-field whose spatial distribution is controlled via plasmon-triggered 2-photon polymerization photosensitive formulation containing QDs. Au nanoparticles various geometries are considered. The response these...
We report on controlled nanoscale photopolymerization triggered by enhanced near fields of silver nanoparticles excited close to their dipolar plasmon resonance. By anisotropic polymerization, symmetry the refractive index surrounding medium was broken: C infinity v turned C2v symmetry. This allowed for spectral degeneracy breaking in particles resonance whose apparent peak became continuously tunable with incident polarization. From peak, we deduced refractive-index ellipsoid fabricated...
We report on the quantitative characterization of plasmonic optical near-field a single silver nanoparticle. Our approach relies nanoscale molecular molding confined electromagnetic field by photoactivated molecules. were able to directly image dipolar profile distribution with resolution better than 10 nm and quantify depth its enhancement factor. A nanoparticle spectral signature was also assessed. This constitutes prerequisite for developing nanophotonic applications.
Optical antennas are elementary units used to direct optical radiation the nanoscale. Here we demonstrate an active control over individual antenna performances by external electrical trigger. We find that in-plane command of anisotropic load medium, electromagnetic interaction between elements constituting can be controlled, resulting in a strong polarization and tuning response. An is prerequisite for directing light wave through utilization such device.
Abstract Metal-insulator-metal systems exhibit a rich underlying physics leading to high degree of tunability their spectral properties. We performed systematic study on metal-insulator-nanostructured metal system with thin 6 nm dielectric spacer and showed how the nanoparticle sizes excitation conditions lead coupling/decoupling localized delocalized plasmonic modes. also experimentally evidenced tunable Fano resonance in broad window 600 800 resulting from interference gap modes white...
Plasmonic nanocrystals with hot spots are able to localize optical energy in small spaces. In such physical systems, near‐field interactions between molecules and plasmons can become especially strong. This paper considers the case of a nanoparticle dimer chiral biomolecule. this model, molecule is placed gap two plasmonic nanoparticles, where electromagnetic spot occurs. Since many important biomolecules have transitions UV spectral region, aluminum nanoparticles considered, as they offer...
High index dielectric nanoparticles have been proposed for many different applications. However, widespread utilization in practice also requires large-scale production methods crystalline silicon nanoparticles, with engineered optical properties a low-cost manner. Here, we demonstrate facile, low-cost, and fabrication method of colloidal Mie resonators water, using blender. The obtained are polydisperse an almost spherical shape the diameters controlled range 100-200 nm by centrifugation...
We present a study of flux pinning by in-plane partial dislocations in melt-textured grown ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}/{\mathrm{Y}}_{2}{\mathrm{BaCuO}}_{5}$ (123/211). The are generated high oxygen pressure (HOP) postprocessing treatment as confirmed transmission electron microscopy (TEM). In order to characterize the dislocation density and perimeter surface ratio (PSR) associated stacking faults large number TEM micrographs have been analyzed. demonstrate that...