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Romain Christophe Rémy Fleury

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Related publications (120)

Nonlinear Second-Order Topological Insulators

Romain Christophe Rémy Fleury, Farzad Zangeneh Nejad

We demonstrate, both theoretically and experimentally, the concept of nonlinear second-order topological insulators, a class of bulk insulators with quantized Wannier centers and a bulk polarization directly controlled by the level of nonlinearity. We show ...

2019

Slow light engineering in resonant photonic crystal line-defect waveguides

Maliheh Khatibi Moghaddam, Romain Christophe Rémy Fleury

Slow light plays an outstanding role in a wide variety of optical applications, from quantum information to optical processing. While slow optical guiding in photonic crystal waveguides is typically based on Bragg band gaps occurring in non-resonant photon ...

2019

Subwavelength robust waveguiding with chiral metamaterial waveguides

Romain Christophe Rémy Fleury, Nadège Sihame Kaïna, Bakhtiyar Orazbayev

In this work, we design and experimentally demonstrate in the microwave range a robust metamaterial waveguide, which is formed at the boundary between two locally resonant chiral metamaterials with opposite chirality. We show that the interface states at s ...

IEEE2019

Active acoustic resonators with reconfigurable resonance frequency, absorption, and bandwidth

Hervé Lissek, Etienne Thierry Jean-Luc Rivet, Romain Christophe Rémy Fleury, Theodoros Koutserimpas

Acoustic resonators play a key role in the development of subwavelength-sized technologies capable of interacting with airborne audible sound, from its emission and absorption to its manipulation and processing. Specifically, artificial acoustic media made ...

American Physical Society (APS)2019

Acoustic birefringence via non-Eulerian metamaterials

Romain Christophe Rémy Fleury, Farzad Zangeneh Nejad

The recently proposed concept of metamaterials has opened exciting venues to control wave-matter interactions in unprecedented ways. Here, we demonstrate the relevance of metamaterials for inducing acoustic birefringence, a phenomenon which has already fou ...

2019

Parametric amplification and bidirectional invisibility in PT-symmetric time-Floquet systems

Romain Christophe Rémy Fleury, Theodoros Koutserimpas

Parity-time (PT)-symmetric wave devices, which exploit balanced interactions between material gain and loss, exhibit extraordinary properties, including lasing and flux-conserving scattering processes. In a seemingly different research field, periodically ...

2018

Toward Wideband Steerable Acoustic Metasurfaces with Arrays of Active Electroacoustic Resonators

Hervé Lissek, Etienne Thierry Jean-Luc Rivet, Romain Christophe Rémy Fleury, Thomas Laurence

We introduce an active concept for achieving acoustic metasurfaces with steerable reflection properties, effective over a wide frequency band. The proposed active acoustic metasurface consists in a surface array of subwavelength loudspeakers diaphragms, ea ...

2018

Zero refractive index in time-Floquet acoustic metamaterials

Romain Christophe Rémy Fleury, Theodoros Koutserimpas

New scientific investigations of artificially structured materials and experiments have exhibit wave manipulation to the extreme. In particular, zero refractive index metamaterials have been on the front line of wave physics research for their unique wave ...

2018

Performing mathematical operations using high-index acoustic metamaterials

Romain Christophe Rémy Fleury, Farzad Zangeneh Nejad

The recent breakthrough in metamaterial-based optical computing devices (2014 Science 343 160) has inspired a quest for similar systems in acoustics, performing mathematical operations on sound waves. So far, acoustic analog computing has been demonstrated ...

2018

Electromagnetic Waves in a Time Periodic Medium With Step-Varying Refractive Index

Romain Christophe Rémy Fleury, Theodoros Koutserimpas

We present an exact mathematical framework for electromagnetic wave propagation in periodically time-modulated media, in which the permittivity is homogenous and modulated in a step-varying fashion. By using Hill’s equation theory, we show that this proble ...

2018

Non-reciprocal optical mirrors based on spatio-temporal acousto-optic modulation

Romain Christophe Rémy Fleury

Here, we investigate a scheme to realize free-space isolators and highly non-reciprocal mirrors with weak modulation imparted by an acoustic wave. We propose a strategy to dramatically break time-reversal symmetry by exploiting resonant interactions betwee ...

2018

Chiral Waveguides for Robust Waveguiding at the Deep Subwavelength Scale

Romain Christophe Rémy Fleury, Nadège Sihame Kaïna, Bakhtiyar Orazbayev

Routing electromagnetic energy at a scale smaller than the wavelength is a highly sought functionality in a variety of applications, including compact lightweight satellite communications, slow-waves sensors, all-optical information processing, and energy ...

American Physical Society (APS)2018

Acoustic Analogues of High-Index Optical Waveguide Devices

Romain Christophe Rémy Fleury, Farzad Zangeneh Nejad

High index optical waveguide devices such as slab waveguides, strip waveguides and fibers play extremely important roles in a wide range of modern applications including telecommunications, sensing, lasing, interferometry, and resonant amplification. Yet, ...

Nature Research2018

Constant-pressure sound waves in non-Hermitian disordered media

Stefan Rotter, Hervé Lissek, Etienne Thierry Jean-Luc Rivet, Romain Christophe Rémy Fleury

When waves impinge on a disordered material they are back-scattered and form a highly complex interference pattern. Suppressing any such distortions of a wave’s free propagation is a challenging task with many applications in a number of different discipli ...

2018

Doppler-Based Acoustic Gyrator

Romain Christophe Rémy Fleury, Farzad Zangeneh Nejad

Non-reciprocal phase shifters have been attracting a great deal of attention due to their important applications in filtering, isolation, modulation, and mode locking. Here, we demonstrate a non-reciprocal acoustic phase shifter using a simple acoustic wav ...

2018

Nonreciprocal Gain in Non-Hermitian Time-Floquet Systems

Romain Christophe Rémy Fleury, Theodoros Koutserimpas

We explore the unconventional wave scattering properties of non-Hermitian systems in which amplification or damping are induced by time-periodic modulation. These non-Hermitian time-Floquet systems are capable of nonreciprocal operations in the frequency d ...

2018

Topological Acoustic Polaritons: Robust Sound Manipulation at the Subwavelength Scale

Romain Christophe Rémy Fleury

Topological insulators, a hallmark of condensed matter physics, have recently reached the classical realm of acoustic waves. A remarkable property of time-reversal invariant topological insulators is the presence of unidirectional spin-polarized propagatio ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2017

Crystalline Metamaterials for Topological Properties at Subwavelength Scales

Romain Christophe Rémy Fleury

Condensed matter physics has been a continuous source of inspiration for wave physicists, due to the strong analogies between electronic propagation in solids and waves interacting with materials. Recently, in this domain, a broad field of research has eme ...

Nature Publishing Group2017

Electroacoustic absorbers I: bridging a gap between active acoustic feedback control and shunt loudspeakers

Hervé Lissek, Romain Boulandet, Romain Christophe Rémy Fleury

Variable acoustic properties can be obtained at the diaphragm of an electroacoustic transducer, with the help of very basic control strategies, among which is the simple electrical shunting of the transducer. These shunt techniques are compared to active a ...

2011

Electroacoustic absorbers: Bridging the gap between shunt loudspeakers and active sound absorption

Hervé Lissek, Romain Boulandet, Romain Christophe Rémy Fleury

The acoustic impedance at the diaphragm of an electroacoustic transducer can be varied using a range of basic electrical control strategies, amongst which are electrical shunt circuits. These passive shunt techniques are compared to active acoustic feedbac ...

Acoustical Society of America2011

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