A5078251670- Near-Field Optical Microscopy
- Plasmonic and Surface Plasmon Research
- Thermal Radiation and Cooling Technologies
- Photonic and Optical Devices
- Gold and Silver Nanoparticles Synthesis and Applications
- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Integrated Circuits and Semiconductor Failure Analysis
- Photonic Crystals and Applications
- Advanced Fluorescence Microscopy Techniques
- Mechanical and Optical Resonators
- Optical Coatings and Gratings
- Metamaterials and Metasurfaces Applications
- Force Microscopy Techniques and Applications
- Strong Light-Matter Interactions
- Quantum Dots Synthesis And Properties
- Random lasers and scattering media
- Advanced Thermodynamics and Statistical Mechanics
- Orbital Angular Momentum in Optics
- Quantum and electron transport phenomena
- Iron-based superconductors research
- Superconducting Materials and Applications
- Photoacoustic and Ultrasonic Imaging
- Optical properties and cooling technologies in crystalline materials
- Advanced Condensed Matter Physics
ESPCI Paris
2016-2025
Institut Langevin
2016-2025
Université Paris Sciences et Lettres
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Institut Laue-Langevin
2023
Institut Jean Nicod
2007-2022
Université Paris-Saclay
2022
École Normale Supérieure - PSL
2004-2017
Sorbonne Université
2002-2017
Laboratoire Kastler Brossel
2017
Tunneling spectroscopy measurements are reported on single crystals of ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ using vacuum tunneling and point-contact methods. A reproducible dip feature in the conductance is found near $|\mathrm{eV}|\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2\ensuremath{\Delta}$, observed for both voltage polarities best resolved spectra. With overdoping position continues to scale with $\ensuremath{\Delta}$, its...
We measure the statistical distribution of local density optical states (LDOS) on disordered semicontinuous metal films. show that LDOS fluctuations exhibit a maximum in regime where fractal clusters dominate film surface. These large are signature surface-plasmon localization nanometer scale.
We report local spectra of the near-field thermal emission recorded by a Fourier transform infrared spectrometer, using tungsten tip as scatterer coupling to far field. Spectra on silicon carbide and dioxide exhibit temporal coherence due thermally excited surface waves. Finally, we evaluate ability this spectroscopy probe frequency dependence electromagnetic density states.
Abstract High refractive index dielectric nanoantennas strongly modify the decay rate via Purcell effect through design of radiative channels. Due to their nature, field is mainly confined inside nanostructure and in gap, which hard probe with scanning techniques. Here we use single-molecule fluorescence lifetime imaging microscopy (smFLIM) map enhancement GaP nanoantenna dimers a median localization precision 14 nm. We measure, gap nanoantenna, rates that are almost 30 times larger than on...
We present scanning tunneling microscopy measurements of the (001) surface a ${\mathrm{LuNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ borocarbide single crystal at 4.2 K. In zero field, conductance versus voltage characteristics recorded various locations on sample reproducibly provide gap value 2.2 meV. magnetic field 1.5 and 0.375 T, recordings as function position reveal regular square vortex lattice tilted by $45\ifmmode^\circ\else\textdegree\fi{}$ with respect to crystalline $a$ axis. This...
Chemical nanosensors with a submicrometer core–shell composite design, based on polymer core, molecularly imprinted (MIP) shell for specific analyte recognition, and an interlayer of gold nanoparticles signal amplification, are described. SERS measurements single yield detection limits 10−7 M the β-blocker propranolol, several orders magnitude lower than plain MIP spheres. Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed, but...
We show that a dimer made of two gold nanospheres exhibits remarkable efficiency for secondharmonic generation under femtosecond optical excitation.The detectable nonlinear emission the given particle size and excitation wavelength arises when nanoparticles are as close possible to contact, in situ controlled measured using tip an atomic force microscope.The dependence second-harmonic signal supports coupled plasmon resonance origin with radiation from gap.This nanometer-size light source...
It is known that the near-field spectrum of local density states electromagnetic field above a SiC/air interface displays an intense narrow peak due to presence surface polariton. has been recently shown this wave can be strongly coupled with sheet plasmon graphene in graphene-SiC heterosystems. Here, we explore interplay between these two phenomena and demonstrate systems presents peaks whose position depends dramatically both on distance chemical potential graphene. This paves way towards...
We demonstrate plasmon-assisted energy transfer between fluorophores located at distances up to 7 μm on the top of a thin silver film. Thanks strong confinement and large propagation length surface plasmon polaritons, range is almost 2 orders magnitude larger than values reported in literature so far. The parameters driving are thoroughly characterized very good agreement with theoretically expected values.Received 15 July 2015DOI:https://doi.org/10.1103/PhysRevLett.116.037401© 2016 American...
Substituting noble metals for high-index dielectrics has recently been proposed as an alternative strategy in nanophotonics to design broadband optical resonators and circumvent the ohmic losses of plasmonic materials. In this report, we demonstrate that subwavelength silicon nanoantennas can manipulate photon emission dynamics fluorescent molecules. practice, it is showed dielectric both increase decrease local density states (LDOS) at room temperature, a process inaccessible with...
Hyperbolic materials can sustain propagating modes with very large wave vectors and are thus characterized by a density of states. In practice, it is possible to mimic hyperbolic material using periodic stack metallic dielectric layers that support surface plasmons vectors. This raises the question nature in metamaterial medium their connection plasmons. Here, we address this experimentally theoretically considering an interface separating from vacuum. We image local states outside at...
In a comparative Andreev-reflection study of normal-superconductor point contacts on the c plane ${\mathrm{UPt}}_{3}$, ${\mathrm{CeCu}}_{2}$${\mathrm{Si}}_{2}$, and ${\mathrm{URu}}_{2}$${\mathrm{Si}}_{2}$ crystals at temperatures down to T=30 mK in magnetic field up B=10 T, differences are found current-voltage characteristics. The behavior differential resistance dV/dI(V) ${\mathrm{UPt}}_{3}$ is attributed presence nodes superconducting order parameter \ensuremath{\Delta}(k^) compared with...
Surface-plasmon polaritons (SPPs) are propagating electromagnetic modes bound at a metal-dielectric interface. We report on electrical generation of SPPs by reproducing the analogue in near field slit-doublet experiment, device which includes all building blocks required for fully integrated plasmonic active source: an generator SPPs, coupler, and passive metallic waveguide. generated upon injection current, they then launched edges strip. The interference fringes arising from standing wave...
We present a novel method to extract the various contributions photonic local density of states from near-field fluorescence maps. The approach is based on simultaneous mapping intensity and decay rate, rigorous application reciprocity theorem. It allows us separate radiative apparent non-radiative change in rate. contribution accounts for losses due radiation out detection solid angle absorption environment. Data analysis relies new analytical calculation, does not require use numerical...
Effective cross sections of nano-objects are fundamental properties that determine their ability to interact with light. However, measuring them for individual resonators directly and quantitatively remains challenging, particularly because the very low signals involved. Here, we experimentally measure thermal emission section metal-insulator-metal nanoresonators using a stealthy hyperuniform distribution based on hierarchical Poisson-disk algorithm. In such distributions, there no...
Linear and non-linear thermo-optical dynamical regimes were investigated in a photonic crystal cavity. First, we have measured the thermal relaxation time an InP-based nano-cavity with quantum dots presence of optical pumping. The experimental method presented here allows one to obtain dynamics temperature nanocavity based on reflectivity measurements cw probe beam coupled through adiabatically tapered fiber. Characteristic times 1.0+/-0.2 micros 0.9+/-0.2 for heating cooling processes...
We report on the experimental and theoretical study of spatial fluctuations local density states (EM-LDOS) fluorescence intensity in near-field a gold nanoantenna. EM-LDOS, topography maps are acquired simultaneously by scanning fluorescent nanosource grafted tip an atomic force microscope at surface sample. The results good quantitative agreement with numerical simulations. This work paves way for full characterization optical
We demonstrate the coupling of a scattering near-field scanning optical microscope combined with Fourier transform infrared spectrometer. The set-up operates using either thermal emission from sample itself, which is proportional to electromagnetic local density states, or an external synchrotron source, broadband and highly brilliant. perform imaging spectroscopy measurements sub-wavelength spatial resolution in mid-infrared range on surfaces made silicon carbide gold capabilities two...