Temnov V.V.,CNRS Le Mans Institute of Molecules and Materials
Nature Photonics | Year: 2012
Surface plasmon-polaritons are electromagnetic waves that propagate along metal-dielectric interfaces and exist over a wide range of frequencies. They have become popular research tools owing to their subwavelength confinement and potential ability to perform ultrasensitive optical measurements. Driven by tremendous progress in nanofabrication techniques and ultrafast laser technologies, the applications of surface plasmon-polariton nano-optics extend beyond nanoplasmonics. In this Review, we discuss how the use of hybrid multilayer structures combining different functionalities allows the development of active plasmonic devices and new metrologies. Magneto-plasmonics, acousto-plasmonics and the generation of high-energy photoelectrons using ultrashort surface plasmon-polariton pulses are all examples of how the combination of ideas developed in these individual fields can be used to generate new knowledge, leading to a range of exciting applications in nanophotonics. © 2012 Macmillan Publishers Limited. All rights reserved.
Kengne-Momo R.P.,CNRS Le Mans Institute of Molecules and Materials
Biointerphases | Year: 2012
A simple electrochemical procedure was used for the synthesis of a polythiophene containing para-benzenesulfonyl chloride groups. The obtained polymer was shown to be very reactive and directly able to covalently bind nucleophile biomolecules. Protein A and a specific antibody were then successively immobilized on the conductive polymer through a covalent bonding of Protein A with the as-prepared linker for bacteria trapping purpose. All reactions were controlled in situ by cyclic voltammetry, quartz crystal microbalance and Raman spectroscopy. The results were compared to those previously obtained on gold surface modified with the same chemical linker. The conductive polymer led to a very high rate of antibody recognition compared to the gold surface and to literature, probably due to a large available surface obtained after polymerization. One example of pathogenic bacteria "Salmonella enterica paratyphi" detection was successfully tested on the substrates. The presented results are promising for the future design of simple and inexpensive immunocapture-based sensors.
Ruello P.,CNRS Le Mans Institute of Molecules and Materials |
Gusev V.E.,CNRS Acoustic Lab of Du Maine University
Ultrasonics | Year: 2015
In this review we address the microscopic mechanisms that are involved in the photogeneration processes of GHz-THz coherent acoustic phonons (CAP) induced by an ultrafast laser pulse. Understanding and describing the underlying physics is necessary indeed for improving the future sources of coherent acoustic phonons useful for the non-destructive testing optoacoustic techniques. Getting more physical insights on these processes also opens new perspectives for the emerging field of the opto-mechanics where lattice motions (surface and/or interfaces ultrafast displacements, nanostructures resonances) are controlled by light. We will then remind the basics of electron-phonon and photon-phonon couplings by discussing the deformation potential mechanism, the thermoelasticity, the inverse piezoelectric effect and the electrostriction in condensed matter. Metals, semiconductors and oxide materials will be discussed. The contribution of all these mechanisms in the photogeneration process of sound will be illustrated over several examples coming from the rich literature. © 2014 Elsevier B.V. All rights reserved.
Szczesniak R.,Czestochowa University of Technology |
Szczesniak D.,Jan Dlugosz University in Czestochowa |
Szczesniak D.,CNRS Le Mans Institute of Molecules and Materials
Physica Status Solidi (B) Basic Research | Year: 2012
The thermodynamic parameters of the superconducting state in calcium under the pressure of 161GPa have been calculated within the framework of the Eliashberg approach. It has been shown that the value of the Coulomb pseudopotential is high (μ* C=0.24) and the critical temperature (TC=25K) should be determined from the modified Allen-Dynes formula. In addition, it has been found that the basic dimensionless ratios of the thermodynamic parameters significantly diverge from the BCS predictions, and take the following values: (i) The zero-temperature energy gap to the critical temperature (R1≡ 2Δ(0)/kBTC) is equal to 4.01. (ii) The ratio R2≡ (CS(TC) equals 2.17, where CSand CNdenote the specific heats for the superconducting and normal states, respectively. (iii) The quantity R3≡TCCN(TC)/H2 C(0)=0.158, where HCindicates the thermodynamic critical field. Finally, it has been proven that the electron effective mass is large and takes the maximum of 2.32meat TC. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Leblanc M.,CNRS Le Mans Institute of Molecules and Materials |
Maisonneuve V.,CNRS Le Mans Institute of Molecules and Materials |
Tressaud A.,CNRS Laboratory of Condensed Matter Chemistry, Bordeaux
Chemical Reviews | Year: 2015
Most important structural types of transition metal fluorocompounds and fluoride salts are reviewed. Besides solid-state or conventional reactions, several new processes are presented for a controlled elaboration of fluorides, such as subcritical solvothermal conditions, gaseous fluorination, reaction in ionic liquids, and low-temperature fluorine insertion. Because of the importance of inorganic metal fluorides in many innovating processes, the knowledge of their structural characteristics appears to be a decisive tool for getting a better understanding of the relevant parameters controlling their physical chemical properties.