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Affichage de 1301 à 1310 sur 16055

  • COMM

[Invited] Tunable topological protection from auxeticity and nonlinearity

Maryam Morvaridi, Federico Bosia, Michele Brun, Vinicius Dal Poggetto, Antonio Gliozzi, Marco Miniaci, Nicola Pugno, Giorgio Carta

The dynamic response of an elastic porous material with a periodic distribution of elongated holes is considered. The presence of the cuts makes the effective behavior auxetic and guarantees the presence of multiple Dirac points in the dispersion diagram. By perturbing the microstructure,...

13th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META23, Session 2A28 - Symposium V: Phononics and Acoustic Metamaterials, Jul 2023, Paris, France. ⟨hal-04278753⟩

  • COMM

Strain sensors based on Fano resonance in plasmomechanical system

Najat Ahmidayi, W. D’orsonens, Thomas Maurer, Gaëtan Lévêque

Due to their unique plasmonic and mechanical properties, plasmomechanical systems have become thoroughly investigated for strain sensing applications. The realization of strain sensors with high performance requires plasmonic resonances with high quality Factor (Q) such as Fano resonances (FR). In...

13th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META23, Jul 2023, Paris, France. ⟨hal-04278736⟩

  • COMM

[Invited] Topological Tamm states based on flat band symmetry inversion

Soufyane Khattou, Amina Rezzouk, Madiha Amrani, Mohamed El Ghafiani, El Houssaine El Boudouti, Abdelkrim Talbi, Bahram Djafari-Rouhani

We study topological Tamm states at the interface between two comb-like photonic or phononic crystals based on a new mechanism of band inversion symmetry due to the existence of flat bands. Several arguments such as the Zak phase or the phase of the reflection coefficients support the topological...

13th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META23, Session 2A44 Symposium II: New Trends in Nanophotonics and Advanced Materials, Jul 2023, Paris, France. ⟨hal-04278791⟩

  • COMM

Exceptional points and skin modes in non-Hermitian elastic phononic beams

Yabin Jin, Runcheng Cai, Wenxin Zhong, Timon Rabczuk, Xiaoying Zhuang, Yan Pennec, Bahram Djafari-Rouhani

Exceptional points and skin effect are two hallmarks of non-Hermitian systems combining gain and loss. We demonstrate these phenomena for flexural waves in phononic beams based on applied forces with feedback control. The non-Hermiticity is realized either by means of applying piezoelectric patches...

13th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META23, Jul 2023, Paris, France. ⟨hal-04278712⟩

  • COMM

[Invited] Quasi-Bound States in the Continuum for Acoustic and Elastic Waves

Marc Marti-Sabaté, Junfei Li, Bahram Djafari-Rouhani, Steven Cummer, Daniel Torrent Marti

We study the localization of flexural and acoustic waves in metasurfaces by means of clusters of scatterers. We show that when the scatterers are placed regularly in the perimeter of a circumference these structures form a resonator which quality factor grows up exponentially with the number of...

13th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META23, Session 1A5 Symposium V: Phononics and Acoustic Metamaterials, Jul 2023, Paris, France. ⟨hal-04278678⟩

  • COMM

Performance of PTS reduction technique using a Stepped-Carrier OFDM scheme for JARC applications

Didem Aydogan, Charles Tatkeu, Yassin El Hillali

Orthogonal Frequency Division Multiplexing (OFDM) is a promising option for integrating radar sensing and vehicular communication in the frequency range of 77-81GHz. Although recent publications emphasize benefits of OFDM for achieving reliable radar detection and efficient vehicular communication...

2023 AEIT International Conference on Electrical and Electronic Technologies for Automotive (AEIT AUTOMOTIVE), Jul 2023, Modena, Italy. pp.1-6, ⟨10.23919/AEITAUTOMOTIVE58986.2023.10217240⟩. ⟨hal-04278250⟩

  • ART

[Review] “Functional upcycling” of polymer waste towards the design of new materials

Olga Guselnikova, Oleg Semyonov, Elizaveta Sviridova, Roman Gulyaev, Alina Gorbunova, Dmitry Kogolev, Andrii Trelin, Yusuke Yamauchi, Rabah Boukherroub, Pavel Postnikov

Diversification of polymer waste recycling is one of the solutions to improve the current environmental scenario. Upcycling is a promising strategy for converting polymer waste into molecular intermediates and high-value products. Although the catalytic transformations into small molecules have...

Chemical Society Reviews, 2023, 52 (14), pp.4755-4832. ⟨10.1039/D2CS00689H⟩. ⟨hal-04170291⟩

  • COMM

A Firefly Algorithm for Energy Efficient Clustering in Wireless Sensor Networks

Mohamed Sahraoui, Abdelmalik Taleb-Ahmed

The fundamental metric token by clustering algorithms in Wireless Sensor Networks (WSN) is energy enhancement to maximize network lifetime. One of the crucial issues is network coverage in order to use all of the network’s resources, which increases the lifetime of the network. Moreover, load...

AID 2022: Artificial Intelligence Doctoral Symposium, Sep 2022, Algiers, Algeria. pp.3-14, ⟨10.1007/978-981-99-4484-2_1⟩. ⟨hal-04203041⟩

  • UNDEFINED

Acoustic dipole surfing on its own acoustic field: toward acoustic quantum analogues

Jean-Paul Martischang, Aymeric Roux, Michael Baudoin

In a recent paper [J. Fluid Mech., 952: A22 (2022)], Roux et al. demonstrated that a translating monopolar acoustic source is subjected to a self-induced radiation force opposite to its motion. This force results from a symmetry breaking of the emitted wave induced by Doppler effect. In the present...

2023. ⟨hal-04148439⟩

  • THESE

Reprise de croissance MOVPE des contacts ohmiques pour des dispositifs de type HEMT à base de GaN, Ohmic contact regrown by MOVPE for GaN-based HEMT type devices

Charles Pitaval

Les transistors à haute mobilité électronique utilisés dans le domaine des hyperfréquences nécessitent une réduction constante de leurs dimensions et de l'optimisation de leurs caractéristiques électriques. Pour répondre à cette exigence, la reprise de croissance de GaN fortement dopé en..., High electron mobility transistors used in the microwave field require a constant reduction of their dimensions and the optimization of their electrical characteristics. To meet this requirement, the regrowth of highly silicon-doped GaN is applied under the ohmic contact metals. This technique,...

Micro et nanotechnologies/Microélectronique. Université de Lille, 2023. Français. ⟨NNT : 2023ULILN020⟩. ⟨tel-04484920⟩