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Affichage de 3131 à 3140 sur 16074

Article dans une revue

Development of broadband high-frequency piezoelectric micromachined ultrasonic transducer array

Xu-Bo Wang, Le-Ming He, You-Cao Ma, Wen-Juan Liu, Wei-Jiang Xu, Jun-Yan Ren, Antoine Riaud, Jia Zhou

Piezoelectric micromachined ultrasonic transducers (PMUT) are promising elements to fabricate a two-dimensional (2D) array with a pitch small enough (approximately half wavelength) to form and receive arbitrary acoustic beams for medical imaging. However, PMUT arrays have so far failed to combine…

Sensors, 2021, 21 (5), pp.1823. ⟨10.3390/s21051823⟩. ⟨hal-03260141⟩

Article dans une revue

Growth temperature effect on physical and mechanical properties of nitrogen rich InN epilayers

Z. Benzarti, T. Sekrafi, A. Khalfallah, Zahia Bougrioua, D. Vignaud, M. Evaristo, A. Cavaleiro

A set of N-polar InN epilayers has been grown at different temperatures by plasma-assisted molecular beam epitaxy (PA-MBE) on GaN/AlN/Al2O3(0001) templates. The purpose is to understand how the variation of crucial factor, such as the temperature, impacts the growth process and the resulting…

Journal of Alloys and Compounds, 2021, 885, pp.160951. ⟨10.1016/j.jallcom.2021.160951⟩. ⟨hal-03542616⟩

Communication dans un congrès

Bowl-shaped ZnO ultrasonic transducer for photoacoustic/ultrasonic multimode microscopy

J. Zhang, D. Zhao, D. Li, F. Tian, Wei-Jiang Xu, X. Wu

A bowl-shaped ultrasonic transducer is proposed for photoacoustic/ultrasonic multimode microscopy. The transducer uses zinc oxide (ZnO) as the piezoelectric material, which has a better electromechanical coefficient than flexible PVDF polymer and ensures the detection sensitivity. The ZnO film is…

2021 IEEE International Ultrasonics Symposium (IUS), Sep 2021, Xi'an, China. ⟨10.1109/IUS52206.2021.9593419⟩. ⟨hal-03541939⟩

Communication dans un congrès

Temperature Sensitivity of Surface Phononic Crystals modes (SPnC) based on Ni Pillars array deposited on LiNBO3

Abdelkrim Talbi, Ghizlane Boussatour, Aurelien Mazzamurro, Cécile Ghouila-Houri, Olivier Boumatar, Philippe Pernod

This work focuses on the theoretical and experimental investigation of acoustic waves sensors based on 2D Surface Phononic Crystals (PnC). We investigated the temperature coefficient of frequency (TCF) for surface localized modes in 2D PnCs composed of Ni pillars deposited on Y-cut LiNBO3 substrate…

2021 Symposium on Design, Test, Integration and Packaging of MEMS and MOEMS, DTIP 2021, Aug 2021, Paris, France. pp.1-3, ⟨10.1109/DTIP54218.2021.9568671⟩. ⟨hal-03541057⟩

Article dans une revue

Optomechanic Coupling in Ag Polymer Nanocomposite Films

Adnane Noual, Eunsoo Kang, Tanmoy Maji, Manos Gkikas, Bahram Djafari-Rouhani, George Fytas

Particle vibrational spectroscopy has emerged as a new tool for the measurement of elasticity, glass transition, and interactions at a nanoscale. For colloid-based materials, however, the weakly localized particle resonances in a fluid or solid medium renders their detection difficult. The strong…

Journal of Physical Chemistry C, 2021, 125 (27), pp.14854-14864. ⟨10.1021/acs.jpcc.1c04549⟩. ⟨hal-03538884⟩

Chapitre d'ouvrage

3 - Path states

L. Dobrzynski, Housni Al Wahsh, Abdellatif Akjouj, El Houssaine El Boudouti, Bahram Djafari-Rouhani, Cécile Ghouila-Houri, Abdelkrim Talbi, Gaëtan Lévêque

Any open and closed loop eigenfunction has zero motion space points, called here robust zeros. Any such zero is robust because its eigenstate cannot be activated by any action applied on it. Indeed, such zero space positions remain unaffected when the loop is interfaced with its outside world only…

Photonics, Part one : photonic paths, Elsevier, pp.21-31, 2021, 978-0-12-819388-4. ⟨10.1016/B978-0-12-819388-4.00012-5⟩. ⟨hal-03350804⟩

Chapitre d'ouvrage

1 - Open loop

L. Dobrzynski, Housni Al Wahsh, Abdellatif Akjouj, El Houssaine El Boudouti, Cécile Ghouila-Houri, Abdelkrim Talbi, Gaëtan Lévêque, Bahram Djafari-Rouhani, Yan Pennec, Yabin Jin

Networks can be constructed out of finite open loops. Open loops are guides such that their one-dimensional properties may be considered independent of the open loop shape and radius. Their response function is derived from that of infinite open loops. A general definition of eigenstates is also…

Photonics, Part one: photonic paths, Elsevier, pp.3-13, 2021, 978-0-12-819388-4. ⟨10.1016/B978-0-12-819388-4.00010-1⟩. ⟨hal-03350729⟩

Article dans une revue

Thermoacoustic wave generation in multilayered thermophones with cylindrical and spherical geometries

Pierre Guiraud, Stefano Giordano, Olivier Bou Matar, Philippe Pernod, Raphael Lardat

A thermoacoustic sound generation model, based on the classical balance equations of the continuum mechanics, is here developed for the cylindrical and the spherical thermoacoustic wave generation. In both geometries, the model considers an arbitrary multilayered structure, where each layer can be…

Journal of Applied Physics, 2021, 129 (11), pp.115103. ⟨10.1063/5.0039458⟩. ⟨hal-03181464⟩

Chapitre d'ouvrage

8 - General wave perspectives

L. Dobrzynski, Housni Al Wahsh, Abdellatif Akjouj, El Houssaine El Boudouti

Many other waves may be investigated with a second order differential equation, function of time and space position, similar to that of Maxwell used in this Photonics book. In many cases, these equations differ one from another only by some coefficients. Without trying to be exhaustive, a few other…

Photonics, Part one: photonic paths, Elsevier, pp.147-151, 2021, 978-0-12-819388-4. ⟨10.1016/B978-0-12-819388-4.00017-4⟩. ⟨hal-03357577⟩

Chapitre d'ouvrage

7 - Eigenfunction rules

L. Dobrzynski, Housni Al Wahsh, Abdellatif Akjouj, El Houssaine El Boudouti

It is well known that eigenfunctions have to be continuous at each space point of the structure in which they are localized. This is not the only rule they have to fulfill. Rules involving eigenfunction derivatives are also used in the bulk and at the boundary of all physical systems. The aim of…

Photonics, Part one: photonic paths, Elsevier, pp.133-145, 2021, 978-0-12-819388-4. ⟨10.1016/B978-0-12-819388-4.00016-2⟩. ⟨hal-03357569⟩