Publications

• Article dans une revue

Hypersonic band gap in an AlN-TiN bilayer phononic crystal slab

S. Hemon, Abdellatif Akjouj, A. Soltani, Yan Pennec, Y. El Hassouani, Abdelkrim Talbi, V. Mortet, Bahram Djafari-Rouhani

We show both theoretically and experimentally the existence of a complete band gap in a phononic crystal (PnC) constituted by periodical air holes drilled in a solid bi-layer slab. The composite slab is formed with an aluminum nitride (AlN) layer deposited on a titanium nitride (TiN) thin metallic…

Applied Physics Letters, 2014, 104, 063101, 5 p. ⟨10.1063/1.4864310⟩. ⟨hal-00947576⟩

• Article dans une revue

Optimization of the optical properties of nanostructured silicon surfaces for solar cell applications

Di Zhou, Yan Pennec, Bahram Djafari-Rouhani, Odile Cristini-Robbe, Tao Xu, Yannick Lambert, Yves Deblock, Marc Faucher, Didier Stiévenard

Surface nanostructuration is an important challenge for the optimization of light trapping in solar cell. We present simulations on both the optical properties and the efficiency of micro pillars--MPs--or nanocones--NCs--silicon based solar cells together with measurements on their associated…

Journal of Applied Physics, 2014, 115, pp.134304. ⟨10.1063/1.4870236⟩. ⟨hal-00974457⟩

• Article dans une revue

Dielectric relaxation analysis of Pb(Zr_0.54,Ti_0.46)O₃ thin films: electric field dependence

Freddy Ponchel, N. Sama, Denis Remiens, T. Lasri

350 nm-thick Perovskite PbZr0.54Ti0.46O3 (PZT) thin films were deposited on Al2O3 substrates by sputtering with and without an additional 10-nm-thick TiOx buffer layer. X-ray diffraction patterns showed that in presence of TiOx buffer layer, PZT film was highly oriented along the (111) direction…

• Article dans une revue

Cross-talk artefacts in Kelvin probe force microscopy imaging : a comprehensive study

Sophie Barbet, Michka Popoff, Heinrich Diesinger, D. Deresmes, Didier Theron, Thierry Melin

We provide in this article a comprehensive study of the role of ac cross-talk effects in Kelvin Probe Force Microscopy (KPFM), and their consequences onto KPFM imaging. The dependence of KPFM signals upon internal parameters such as the cantilever excitation frequency and the projection angle of…

Journal of Applied Physics, 2014, 115 (14), pp.144313. ⟨10.1063/1.4870710⟩. ⟨hal-00981142⟩

• Article dans une revue

Negative effective mass density of acoustic metamaterial plate decorated with low frequency resonant pillars

Mourad Oudich, Bahram Djafari-Rouhani, Yan Pennec, M. Badreddine Assouar, Bernard Bonello

We investigate the elastic wave dispersion by a phononic metamaterial plate containing low frequency resonator stubs arranged periodically over the plate. We show that this system not only provides stop bands for wavelengths much larger than the periodicity but also displays negative behavior of…

Journal of Applied Physics, 2014, 116 (18), ⟨10.1063/1.4901462⟩. ⟨hal-01233805⟩

• Communication dans un congrès

Modeling and evaluation of power transmission of flapping wing nano air vehicle

Alexandre Bontemps, Sébastien Grondel, Thomas Vanneste, Samuel Dupont, Eric Cattan

In the last decade researchers pursued the development of tiny flying robots inspired by natural flyers. Within this context our main objective is to devise a flying robot-mimicking insect in terms of kinematics and scale using MEMS technologies. For this purpose, an original design has been…

IEEE/ASME 10th International Conference on Mechatronic and Embedded Systems and Applications (MESA), Sep 2014, Senigallia, Italy. pp.1-6, ⟨10.1109/MESA.2014.6935524⟩. ⟨hal-03280242⟩

• Article dans une revue

Influence of processing gases on the properties of cold atmospheric plasma SiOxCy coatings

H. Hamze, Maude Jimenez, D. Deresmes, Arnaud Beaurain, Nicolas Nuns, Michel Traisnel

Thin layers of SiOxCy (y = 4−x and 3 ≤ x ≤ 4) were applied using a cold atmospheric plasma torch on glass substrates. The aim was to investigate using Atomic Force Microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (Tof-Sims) the influence of…

Applied Surface Science, 2014, Applied Surface Science, 315 (1), pp.531-537. ⟨10.1016/j.apsusc.2013.12.108⟩. ⟨hal-03055748⟩

• Article dans une revue

Enhancement of thermoelectric power factor in NaxCoO2/Au multilayers

Xiaohui Zhao, Haifeng Wang, Shufang Wang, El Hadj Dogheche, Jianglong Wang, Guangsheng Fu

NaxCoO2/Au thin film multilayers, with a thickness of the Au layer of 0.5–12 nm, have been fabricated on c-Al2O3 by post annealing of the CoO/Au thin film multilayers in Na vapor at high temperature in air. X-ray diffraction measurements revealed that the resulting NaxCoO2 layer was c-axis oriented…

RSC Advances, 2014, 4 (100), pp.57148-57152. ⟨10.1039/C4RA07319C⟩. ⟨hal-03560771⟩

• Article dans une revue

Bragg band gaps tunability in an homogeneous piezoelectric rod with periodic electrical boundary conditions

Sébastien Degraeve, Christian Granger, Bertrand Dubus, Jerome O. Vasseur, Mai Pham Thi, Anne-Christine Hladky

An homogeneous piezoelectric rod is shown to exhibit Bragg band gaps when an electrical boundary condition is applied periodically with the help of metallic electrodes. An analytical model is developed which formulation depends on the applied electric boundary condition and reveals that Bragg band…

Journal of Applied Physics, 2014, 115, 194508, 8 p. ⟨10.1063/1.4876757⟩. ⟨hal-00995265⟩

• Article dans une revue

From 'petal effect' to 'lotus effect' on the highly flexible Silastic S elastomer microstructured using a fluorine based reactive ion etching process

Christophe Frankiewicz, Farzam Zoueshtiagh, Abdelkrim Talbi, Jeremy Streque, Philippe Pernod, Alain Merlen

A fluorine-based reactive ion etching (RIE) process has been applied on a new family of silicone elastomers named 'Silastic S' for the first time. Excellent mechanical properties are the principal advantage of this elastomer. The main objective of this study was (i) to develop a new…

Journal of Micromechanics and Microengineering, 2014, 24 (11), ⟨10.1088/0960-1317/24/11/115008⟩. ⟨hal-03277849⟩