A5061163692- Carbon Nanotubes in Composites
- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Graphene research and applications
- Photonic Crystals and Applications
- Silicon Nanostructures and Photoluminescence
- Nonlinear Optical Materials Studies
- Advanced Fiber Laser Technologies
- Nanopore and Nanochannel Transport Studies
- Molecular Junctions and Nanostructures
- Boron and Carbon Nanomaterials Research
- Advanced Photonic Communication Systems
- Nonlinear Optical Materials Research
- Nanowire Synthesis and Applications
- Fullerene Chemistry and Applications
- Fern and Epiphyte Biology
- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Semiconductor Lasers and Optical Devices
- 2D Materials and Applications
- Synthesis and Characterization of Pyrroles
- Nanotechnology research and applications
- Laser-Ablation Synthesis of Nanoparticles
- Synthesis and properties of polymers
- Semiconductor Quantum Structures and Devices
Centre National de la Recherche Scientifique
2011-2023
Laboratoire Charles Coulomb
2015-2023
Université de Montpellier
2004-2023
Université Paris-Sud
2010-2016
Université Paris-Saclay
2015-2016
Direction de la Recherche Fondamentale
2012
National Institute of Advanced Industrial Science and Technology
2008-2011
Institut Supérieur d'Électronique de Paris
2011
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2006-2009
CEA Paris-Saclay
2006-2009
Substantial progress on field effect transistors (FETs) consisting of semiconducting single wall carbon nanotubes (s-SWNTs) without detectable traces metallic and impurities is reported. Nearly perfect removal confirmed by optical absorption, Raman measurements, electrical measurements. This outstanding result was made possible in particular ultracentrifugation (150000g) solutions prepared from SWNT powders using polyfluorene as an extracting agent toluene. Such s-SWNTs processable were...
A mild and efficient method for the functionalization of SWNTs by cycloaddition azomethine ylides derived from trialkylamine-N-oxides is described. Selective reaction semiconducting carbon nanotubes was achieved preorganizing starting N-oxides on nanotube surface prior to generating reactive ylides. Separation met-SWNTs functionalized sem-SWNTs successfully accomplished inducing solubilization in presence lignoceric acid.
High frequency capabilities of carbon nanotube field-effect transistors (CNTFETs) are investigated. Structures with a large number single-walled nanotubes were fabricated using dielecrophoresis to increase the density in device channel. The authors obtained an intrinsic current gain cutoff 30GHz establishing state-of-the-art high (hf) potentialities CNTFETs. also showed maximum stable above 10dB at 20GHz. Finally, parameters equivalent circuit model multitube CNTFET 20GHz determined, which...
We investigate the influence of wavelength, within 1.3μm-1.63μm range, on second-order optical nonlinearity in silicon waveguides strained by a nitride (Si₃N ₄) overlayer. The effective susceptibility χxxy(2)¯ evolutions have been determined for 3 different waveguide widths 385 nm, 435 nm and 465 it showed higher values longer wavelengths narrower waveguides. For wWG = λ 1630 we demonstrated as high 336 ± 30 pm/V. An explanation based strain distribution its overlap with mode is then given...
Semiconducting single-wall carbon nanotubes (s-SWNTs) have proved to be promising material for nanophotonics and optoelectronics. Due the possibility of tuning their direct band gap controlling excitonic recombinations in near-infrared wavelength range, s-SWNT can used as efficient light emitters. We report first experimental demonstration room temperature intrinsic optical gain high 190 cm−1 at a 1.3 μm thin film doped with s-SWNT. These results constitute significant milestone toward...
We report studies of optical Fabry-Perot microcavities based on semiconducting single-wall carbon nanotubes with a quality factor 160. experimentally demonstrate huge photoluminescence signal enhancement by 30 in comparison the identical film and 180 if compared thin containing non-purified (8,7) nanotubes. Futhermore, spectral full-width at half-maximum photo-induced emission is reduced down to 8 nm very good directivity wavelength about 1.3 $\mu$m. Such results prove great potential for...
The use of optics in microelectronic circuits to overcome the limitation metallic interconnects is more and considered as a viable solution. Among future silicon compatible materials, carbon nanotubes are promising candidates thanks their ability emit, modulate, detect light wavelength range transparency. We report first integration with waveguides, successfully coupling emission absorption properties. A complete study this between waveguides was carried out, which led demonstration...
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Aqueous suspensions of bundles and individual single-wall carbon nanotubes were prepared with the help surfactants. We study changes in Raman spectra respect to powders, exfoliated tubes bundles. The radial breathing modes (RBM) upshift because internal pressure liquid. By contrast, no shift is observed RBM after exfoliation suspensions. However, we demonstrate a selectivity process for small diameters.
We report room temperature direct gap electroluminescence (EL) from a Ge/Si0.15Ge0.85 multiple quantum well (MQW) waveguide. The excitonic transition and the dependence of EL intensity on injection currents are clearly observed. Ge/SiGe MQWs is shown to have transverse-electric polarization. These results demonstrate strong potential in terms realization monolithically integrated light source Si platform.
We investigate the role of carbon nanotubes structure on their optical limiting properties. Samples different and well-characterized structural features are studied by pump–probe experiments. The influence diameter's size nano-object is demonstrated. Indeed, both nucleation growth gas bubbles expected to be sensitive diameter.
We report on coupling between semiconducting single-wall carbon nanotubes (s-SWNT) photoluminescence and silicon microring resonators. Polyfluorene extracted s-SWNT deposited such resonators exhibit sharp emission peaks, due to interaction with the cavity modes of Ring radius 5 μm 10 were used, reaching quality factors up 4000 in emission. These are among highest values reported for coupled an integrated platform, which open possibility build based efficient light source silicon.
Raman intensity of intramolecular and lattice modes crystalline alpha-bithiophene (alpha-2T) are investigated within density functional theory using a nonlinear response formalism. First, comparison between the calculated spectrum experimental data allows assignment main lines over whole frequency range. Then, bond polarizability (BP) model, limited to first neighbors, is built. We show that, although BP model cannot reproduce changes dielectric susceptibility under individual atomic...
Photoluminescence properties of semiconducting single-wall carbon-nanotube (s-SWNT) thin films with different metallic (m-SWNT) concentrations are reported. s-SWNT purified samples obtained by polymer-assisted selective extraction. We show that the presence a few m-SWNTs in sample generates drastic quenching emission. Therefore, highly film is strongly luminescent material and good candidate for future applications photonics, such as near-IR emitters, modulators, detectors.
Single-wall carbon nanotube are considered a fascinating nanomaterial for photonic applications and especially promising efficient light emitter in the telecommunication wavelength range.Furthermore, their hybrid integration with silicon structures makes them an ideal platform to explore instrinsic properties.Here we report on strong photoluminescence enhancement from nanotubes integrated ring resonator circuit under two pumping configurations: surface-illuminated at 735 nm collinear 1.26...
Polarized fluorescence emission of nanoscale emitters has been extensively studied for applications such as bioimaging, displays, and optical communication. Extending the polarization properties in large assemblies compact is, however, challenging because self-aggregation processes, which can induce depolarization effects, quenching, cancellations molecular dipoles. Here we use α-sexithiophene (6T) molecules confined inside boron nitride nanotubes (6T@BNNTs) to anisotropy a transparent host....
Silicon photonics has emerged as a very promising technology platform for the implementation of high-performance, low-cost, ultra-compact circuits that can monolithically cointegrate electronic, opto-electronic and optic functionalities. However, Si neither efficient light emission or detection in telecom wavelength range, nor exhibits electro-optic Pockels effect, hindering integrated active devices like sources, detectors, modulators. Current approaches relay on different materials to...
Abstract A biosensor taking advantage of the optical properties sorted carbon nanotubes has been developed. polyfluorene polymer bearing azido groups was synthesized and used for selective extraction semi‐conducting from bulk population. The resulting polymer‐decorated were then conjugated by click‐chemistry to a ligand unit (biotin), sensing biotinylated investigated photoluminescence measurements, upon interaction with streptavidin target.
Flexible implementation of graded two-dimensional planar photonic crystals is proposed for wavelength demultiplexing. Equations Hamiltonian optics are used to study light propagation beyond the homogeneous regime using an analytical approximation crystal dispersion relationship. The approach applied a structure enabling two-wavelength demultiplexing three possible sets wavelengths around λ = 1550 nm. Insertion loss and interchannel crosstalk calculated finite-difference time-domain...
We show that the properties of thin conductive inkjet printed lines single-walled carbon nanotubes (SWCNT) can be greatly tuned, using only a few deposition parameters. The morphology, anisotropy and electrical resistivity single-stroke are studied as function ink concentration drop density. An original method based on coupled profilometry-Raman measurements is developed to determine height, mass, orientational order density profiles SWCNT across with micrometric lateral resolution. Height...
The main hurdle preventing the widespread use of single-walled carbon nanotubes remains lack methods with which to produce formulations pristine, unshortened, unfunctionalized, individualized nanotubes, thus preserving their extraordinary properties. In particular, sonication leads shortening, is detrimental percolation properties (electrical, thermal, mechanical, etc.). Using reductive dissolution and transfer into degassed water, open-ended, water-filled can be dispersed as in...