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Affichage de 5091 à 5100 sur 16181

Article dans une revue

Optical transmission properties of an anisotropic defect cavity in one-dimensional photonic crystal

Noama Ouchani, Abdelaziz El Moussaouy, Hassan Aynaou, Youssef El Hassouani, El Houssaine El Boudouti, Bahram Djafari-Rouhani

We investigate theoretically the possibility to control the optical transmission in the visible and infrared regions by a defective one dimensional photonic crystal formed by a combination of a finite isotropic superlattice and an anisotropic defect layer. The Green's function approach has…

Physics Letters A, 2018, 382 (4), pp.231-240. ⟨10.1016/j.physleta.2017.11.020⟩. ⟨hal-03183514⟩

Article dans une revue

Optical and Thermal Performances of (Ga,In)N/GaN Light Emitting Diodes Transferred on a Flexible Tape

B. Damilano, Marie Lesecq, Di Zhou, Éric Frayssinet, Sebastien Chenot, Julien Brault, N. Defrance, Abel Ebongue, Y. Cordier, Virginie Hoel

Blue (Ga,In)N-based light-emitting diodes (LEDs) grown on a Si(111) substrate by metal-organic vapor phase epitaxy are transferred on a flexible tape after the Si substrate removal. Their optical and thermal behaviors are measured and compared to those of regular LEDs on Si. The light output power…

IEEE Photonics Technology Letters, 2018, 30 (17), pp.1567-1570. ⟨10.1109/LPT.2018.2858000⟩. ⟨hal-02304909⟩

Article dans une revue

Two dimensional modeling of elastic wave propagation in solids containing cracks with rough surfaces and friction – Part I: Theoretical background

Vladislav Aleshin, Steven Delrue, Andrey Trifonov, Olivier Bou Matar, Koen van den Abeele

Abstract Our study aims at the creation of a numerical toolbox that describes wave propagation in samples containing internal contacts (e.g. cracks, delaminations, debondings, imperfect intergranular joints) of known geometry with postulated contact interaction laws including friction. The code…

Ultrasonics, 2018, 82, pp.11-18. ⟨10.1016/j.ultras.2017.07.002⟩. ⟨hal-02364063⟩

Article dans une revue

10-Gb/s Indoor THz Communications Using Industrial Si Photonics Technology

Elsa Lacombe, Cybelle Belem-Gonçalves, Cyril Luxey, Frédéric Gianesello, Cédric Durand, Daniel Gloria, Guillaume Ducournau

In this letter, we report the design, fabrication, and measurement of a silicon photonics-based transmitter (Tx) offering both mass production capability and high integration level potentiality. The Tx circuit consists of an integrated photodiode generating a 200-300-GHz signal for photonic…

IEEE Microwave and Wireless Components Letters, 2018, 28 (4), pp.362-364. ⟨10.1109/LMWC.2018.2811242⟩. ⟨hal-03183484⟩

Article dans une revue

A simplified modal expansion formalism adapted to the optical design of resonant cavity enhanced photodetectors using metallic gratings

Maximilien Billet, Emilien Peytavit

In this communication, we present a method to model the light absorption in a resonant photoconductor based on a photoconductive layer sandwiched between a metallic grating in front side and a metallic backside mirror. We started from a modal expansion formalism previously developed in order to…

Optik, 2018, 154, pp.828 - 839. ⟨10.1016/j.ijleo.2017.10.041⟩. ⟨hal-02997746⟩

Article dans une revue

GaN-on-silicon high-electron-mobility transistor technology with ultra-low leakage up to 3000 V using local substrate removal and AlN ultra-wide bandgap

Ezgi Dogmus, Malek Zegaoui, F Medjdoub

We report on extremely low off-state leakage current in AlGaN/GaN-on-silicon metal–insulator–semiconductor high-electron-mobility transistors (MISHEMTs) up to a high blocking voltage. Remarkably low off-state gate and drain leakage currents below 1 µA/mm up to 3 kV have been achieved owing to the…

Applied Physics Express, 2018, 11 (3), pp.034102. ⟨10.7567/APEX.11.034102⟩. ⟨hal-02356739⟩

Article dans une revue

Dynamics of a broad-band quantum cascade laser: from chaos to coherent dynamics and mode-locking

L. Columbo, S Barbieri, C. Sirtori, M. Brambilla

The dynamics of a multimode quantum cascade laser, are studied in a model based on effective semiconductor Maxwell-Bloch equations, encompassing key features for the radiation-medium interaction such as an asymmetric frequency dependent gain and refractive index as well as the phase-amplitude…

Optics Express, 2018, 26 (3), pp.2829. ⟨10.1364/OE.26.002829⟩. ⟨hal-02403192⟩

Article dans une revue

Microscale ultrahigh-frequency resonant wireless powering for capacitive and resistive MEMS actuators

Yoshio Mita, Naoyuki Sakamoto, Naoto Usami, Antoine Frappé, Akio Higo, Bruno Stefanelli, Hidehisa Shiomi, Julien Bourgeois, Andreas Kaiser

This paper presents a versatile chip-level wireless driving method for microelectromechanical system (MEMS) actuators. A MEMS actuator is integrated as an electrical component of a coupled LCR resonant circuit, and it rectifies the energy sent through an ultrahigh-frequency (UHF) radio frequency (…

Sensors and Actuators A: Physical , 2018, 275, pp.75-87. ⟨10.1016/j.sna.2018.03.020⟩. ⟨hal-02182815⟩

Article dans une revue

Accuracy of parameter identification using the dispersion of surface waves and the role of data quality for inhomogeneous concrete

Radoslaw Drelich, Mariusz Kaczmarek, Bogdan Piwakowski

We study the influence of the data quality on the accuracy of parameter identification for inhomogeneous concrete. The surface of the concrete may differ as a result of either intentional action (decoration or repair) or the interaction of initially homogeneous concrete with the environment. Non-…

NDT & E International, 2018, 98, pp.195-207. ⟨10.1016/j.ndteint.2018.05.002⟩. ⟨hal-03185113⟩

Article dans une revue

Modeling of a Circular Ring MEMS Resonator with Voltage Excitation by Means of an Orthogonal Polynomial Method

Ismail Naciri, Abdessamad Rguiti, Lahoucine Elmaimouni, Jean-Etienne Lefebvre, Faniry Emilson Ratolojanahary, Tadeusz Gryba

The three-dimensional vibrational behavior of a piezoelectric circular ring made of a 6 mm hexagonal material is studied using Legendre polynomial method. The method is simple to implement and based on expanding the electrical potential and the mechanical displacement components in a double series…

Acta Acustica united with Acustica, 2018, 104 (4), pp.553-560. ⟨10.3813/AAA.919196⟩. ⟨hal-03185120⟩