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Affichage de 1331 à 1340 sur 16429

Article dans une revue

Tunable topologically protected waveguiding in auxetic nonlinear metamaterials

M. Morvaridi, F. Bosia, M. Brun, V.F. Dal Poggetto, A.S. Gliozzi, M. Miniaci, C. Croenne, N.M. Pugno, G. Carta

In this paper, we discuss the possibility of achieving tunable topologically protected edge modes through the application of uniaxial prestrain in an auxetic metamaterial. The proposed structure consists of a thin slab with oriented cuts in a hexagonal lattice, where topologically protected band…

Physical Review Applied, 2024, 21 (3), pp.034024. ⟨10.1103/PhysRevApplied.21.034024⟩. ⟨hal-04526207⟩

Article dans une revue

Optimizing Connectivity: DVB-RCS2 Uplink to GEO Satellites via Optical Wireless Communication

Meryem Romaissa Djellouli, Sid Ahmed Chouakri, Abdelkrim Ghaz, Abdelmalik Taleb-Ahmed

This research focuses on the integration of an opto-satellite system based on Free Space Optical Communication (OWC) within DVB-RCS2 chains, implementing 16-QAM modulation techniques and Optical Time Division Wavelength Multiplexing (OTDMWDM). A co-simulation framework combining the MATLAB and…

Progress In Electromagnetics Research C, 2024, 150, pp.135-144. ⟨10.2528/PIERC24100601⟩. ⟨hal-04839773⟩

Article dans une revue

FT-IR detection of DMMP on TiO 2 -Modified Porous Silicon Substrates

Warda Raiah, M. Guendouz, Parastesh Pirasteh, Vincent Thomy, Joël Charrier, Yannick Coffinier

In this study, we present a new chemical sensor based on a functionalized porous silicon and sensitive to dimethyl methyl phosphonate (DMMP), a simulant of sarin gas, known as one of the most toxic warfare agents. The porous silicon was prepared by anodising a boron-doped p-Si (100) wafer. A metal…

Materials Today Chemistry, 2024, 42, pp.102363. ⟨10.1016/j.mtchem.2024.102363⟩. ⟨hal-04774473v2⟩

Article dans une revue

Immunity to Backscattering of Bulk Waves in Topological Acoustic Superlattices

P A Deymier, Jérome O Vasseur, K. Runge, A. Khanikaev, A. Alù

We herein investigate the scattering of orthogonal counterpropagating waves and one-way propagating bulk waves in discrete acoustic superlattices subjected to a scattering potential applied to one of the superlattice unit cells. We demonstrate theoretically that the orthogonality of…

Crystals, 2024, 14 (4), pp.344. ⟨10.3390/cryst14040344⟩. ⟨hal-04544219⟩

Article dans une revue

A Tight-Binding Model for Illustrating Exciton Confinement in Semiconductor Nanocrystals

Z. Hens, Christophe Delerue

The Brus equation describes the relation between the lowest energy of an electron–hole pair and the size of a semiconductor crystallite. However, taking the strong confinement regime as a starting point, the equation does not cover the transition from weak to strong confinement, the accompanying…

The Journal of Chemical Physics, 2024, 160 (11), pp.114106. ⟨10.1063/5.0192031⟩. ⟨hal-04513566⟩

Communication dans un congrès

Enabling Low-Power Signature Recognition for the IoT with SLIF neurons

Guillaume Marthe, Claire Goursaud, Laurent Clavier

Energy constraints are still a significant challenge in numerous IoT applications, particularly due to the excessive power consumption of microcontrollers. To overcome this limitation, novel circuit designs have been introduced, with the integration of spiking neurons and analog computing emerging…

EUSIPCO 2024 - 32nd European conference on signal processing, Aug 2024, Lyon, France. pp.1-5. ⟨hal-04788239⟩

Article dans une revue

On the Performance of a Photonic Reconfigurable Electromagnetic Band Gap Antenna Array for 5G Applications

Taha A Elwi, Fatma Taher, Bal S Virdee, Mohammad Alibakhshikenari, Ignacio J Garcia Zuazola, Astrit Krasniqi, Amna Shibib Kamel, Nurhan Türker Tokan, Salahuddin Khan, Naser Ojaroudi Parchin, Patrizia Livreri, Iyad Dayoub, Giovanni Pau, Sonia Aïssa, Ernesto Limiti, Mohamed Fathy Abo Sree

In this paper, a reconfigurable Multiple-Input Multiple-Output (MIMO) antenna array is presented for 5G portable devices. The proposed array consists of four radiating elements and an Elec- tromagnetic Band Gap (EBG) structure. Planar monopole radiating elements are employed in the array with…

IEEE Access, 2024, 12, pp.60849 - 60862. ⟨10.1109/access.2024.3392368⟩. ⟨hal-04569351⟩

Communication dans un congrès

500 GHz operational bandwidth MUTC-photodiodes with milliwatt terahertz output power levels

Ezgi Abacıoğlu, Marcel Grzeslo, Tom Neerfeld, Abdu Subahan Mohammed, J L F Estévez, Guillaume Ducournau, Andreas Stöhr

We present waveguide-integrated 1.55 μm InP-based modified uni-travelling-carrier photodiodes (MUTC-PDs) featuring coplanar waveguide outputs. The fabricated photodiodes yield an operational bandwidth of 500 GHz and milliwatt output power levels in the lower THz domain.

49th European Conference on Optical Communications (ECOC 2023), Oct 2023, Hybrid Conference, Glasgow, United Kingdom. pp.1410 - 1413, ⟨10.1049/icp.2023.2572⟩. ⟨hal-04695657⟩

Article dans une revue

Autonomous radar interference detection and mitigation using neural network and signal decomposition

Dayat Kurniawan, Budiman Putra Asmaur Rohman, Ratna Indrawijaya, Chaeriah Bin Ali Wael, Suyoto Suyoto, Purwoko Adhi, Iman Firmansyah

Autonomous radar interference is a challenging problem in autonomous vehicle systems. Interference signals can decrease the signal-to-interference-noise ratio (SINR), and this condition decreases the performance detection of autonomous radar. This paper exploits a neural network and signal…

IAES International Journal of Artificial Intelligence (IJ-AI), 2024, 13 (3), pp.2854-2861. ⟨10.11591/ijai.v13.i3.pp2854-2861⟩. ⟨hal-04673052⟩

Article dans une revue

Interdigitated-comb piezoelectric phononic crystals for innovative SAW devices

R. Alcorta Galván, C. Croënne, B. Dubus, E. Eustache, A. Ngabonziza, A.-C. Hladky-Hennion

In this paper, piezoelectric phononic crystals made up of interdigitated combs in floating potential condition are studied. Calculation of the dispersion curves shows that, in addition to Bragg bandgaps due to the presence of periodic electrodes, supplementary bandgaps are present corresponding to…

Applied Physics Letters, 2024, 125 (12), pp.121703. ⟨10.1063/5.0222994⟩. ⟨hal-04738331⟩