Materials Literature
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The high level of accumulated expertise by ULIS and CEA/LETI on uncooled microbolometers made from an amorphous silicon layer enables ULIS to develop 384 x 288 (1/4 VGA) IRFPA format with 25 μm pixel-pitch designed for low end application. This detector has kept all the innovations developed on the full TV format R…
We present helium atom scattering measurements of the boson peak at the surface of vitreous silica between 127.0 and 368.5 K. The most probable energy shows a strong temperature dependence and increases linearly with temperature in the measured range. The observed blueshift of the surface boson peak (shift rate 0.008+…
The image contrast and clarity recorded by backside illuminated HgCdTe focal plane arrays (FPAs) is strongly dependent on minimizing signal loss and detector noise caused by scattered and reflected light from the FPA window and imaging optics. Thin film anti-reflection (AR) treatments based on stacks of thin-film mate…
This paper presents recent developments in next generation microbolometer Focal Plane Array (FPA) technology at L-3 Communications Infrared Products (L-3 CIP). Infrared detector technology at L-3 CIP is based on hydrogenated amorphous silicon (a-Si:H) and amorphous silicon germanium(a-SiGe:H). Large format high perfor…
Tetragonal PbTiO 3 under uniaxial stress along the c -axis is investigated from first-principles. The structural parameters, polarization, and squares of the lowest optical phonon frequencies for E (1TO) and A 1 (1TO) modes at Γ show abrupt changes near a stress σ c of 1.04 GPa, which is related to the dramatic change…
We present Raman scattering studies of the structural and magnetic phases that accompany temperature- and field-dependent melting of charge- and orbital-order (COO) in ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ and ${\mathrm{La}}_{0.25}{\mathrm{Pr}}_{0.375}{\mathrm{Ca}}_{0.375}{\mathrm{MnO}}_{3}$. Our…
High resolution chemical imaging of surfaces can be achieved using Tip Enhanced Raman Spectroscopy(TERS), an emerging technique that combines scanning probe microscopy with optical spectroscopy and takes advantage of apertureless near-field optics to obtain lateral resolution dramatically better than that provided by…
We investigate the possible application of a modified deoxyribonucleic acid (DNA)-dye system for dynamic processing of optical information, e.g., optical correlation. The system consists of a biopolymeric matrix made of DNA substituted with the cationic surfactant molecule cetyltrimethyl-ammonium chloride (CTMA) and d…
First-principles calculations were performed on $\text{Zn}{({\text{BH}}_{4})}_{2}$ using density functional theory (DFT) within the local density approximation and the projected augmented wave method. $\text{Zn}{({\text{BH}}_{4})}_{2}$ is a promising candidate for hydrogen storage with a capacity of 8.5 $\text{wt}\tex…
Double-Friauf polyhedra (DFPs) which play important roles in quasicrystal (QC) models are the unique building blocks in the novel 1/0 AC, CaAu(3+Delta)Ga(1-Delta) (Delta approximately equal to 0-0.13) [Pa_3; a = 9.0875(3)-9.1107(5) A]. The packing of DFPs generates interpenetrating networks of condensed three-dimensio…
The Laboratoire Infrarouge (LIR) of the Electronics and Information Technology Laboratory (LETI) has been involved in the development of Uncooled IR technology since 1986. Along these years, more and more technology improvements have been done at LETI and ULIS for large-scale production and broad commercialisation of…
In Escherichia coli, the complex II superfamily members succinate:ubiquinone oxidoreductase (SQR) and quinol:fumarate reductase (QFR) participate in aerobic and anaerobic respiration, respectively. Complex II enzymes catalyze succinate and fumarate interconversion at the interface of two domains of the soluble flavopr…
The halide derivatives of yttrium ortho-oxomolybdate YX[MoO 4] (X = F, Cl) both crystallize in the monoclinic system with four formula units per unit cell. YF[MoO 4] exhibits a primitive cell setting (space group P21/ c; a = 519.62(2) pm, b = 1225.14(7) pm, c = 663.30(3) pm, beta = 112.851(4) degrees ), whereas the la…
Twelve isostructural lanthanide oxalatophosphites with the general formula [Ln(H2O)(C2O4)0.5(HPO3)]·H2O have been synthesized and structurally characterized. The structure is built of inorganic layers of lanthanide phosphites which are linked by oxalate ligands to form a 3D framework structure. They are the first exam…
We developed a novel system of poly(lactide acid)-d-alpha-tocopheryl polyethylene glycol 1000 succinate (PLA-TPGS) nanoparticles (NPs) for quantum dots (QDs) formulation to improve imaging effects and reduce side effects as well as to promote a sustainable imaging. The QDs-loaded PLA-TPGS NPs were prepared by a modifi…
The invention of metamaterials prompts reconsideration of a number of fundamental physical phenomena and enables a variety of unique properties and functionalities. These include negative refractive index, magnetism at optical frequencies, sub-wavelength resolution, ``backward'' phase matching conditions for nonlinear…
Efficient multiple-exciton generation (MEG) in semiconductor quantum dots has been recently reported. The MEG efficiency has so far been evaluated assuming that the change (bleaching) of the absorption spectrum due to MEG is linearly proportional to the number of excitons N(X). Here, we critically examine this assumpt…
Nach dem Vorbild von Eierschalen in der Natur wurden lebende Hefezellen mit einem künstlichen Mineralüberzug versehen. Dazu wurde die schichtweise (LBL) Behandlung mit funktionellen Polymeren mit einer biomimetischen In-situ-Mineralisierung kombiniert. Die gebildeten harten anorganischen Schalen haben enorme Auswirkun…
In this paper we present the formulation, preparation and characterization of new polymeric composite materials containing a nano-hybrid to be used for the controlled molecular delivery of an anti-inflammatory molecule, Diclofenac. The nano-hybrid consists of a layer of double hydroxide of an Mg-Al hydrotalcite type,…
Reaching 100% selectivity is the theme of the twentyfirst century in heterogeneous and heterogenized homogeneous catalysis. To study chemical reactivity at the atomic scale, model systems have been prepared and characterized. We discuss selectivity of hydrogenation and dehydrogenation reactions on supported Pd particl…