Publications by Romain Christophe Rémy Fleury

Disorder-assisted real–momentum topological photonic crystal

Romain Christophe Rémy Fleury, Haoye Qin, Bo Li, Ji Zhou

Topological defects and disorder counteract each other. Intuitively, disorder is considered detrimental, requiring efforts to mitigate its effects in conventional topological photonics. We propose a counter-intuitive approach that exploits a real–momentum ...

Springer Science and Business Media LLC2025

Experimental demonstration of a space-time-modulated airborne acoustic circulator

Romain Christophe Rémy Fleury, Matthieu Francis Malléjac

Achieving strongly nonreciprocal scattering in compact linear acoustic devices is a challenging task. One possible solution is the use of time-modulated resonators; however, their implementation in the realm of audible airborne acoustics is typically hinde ...

American Physical Society (APS)2025

Active control of electroacoustic resonators in the audible regime: control strategies and airborne applications

Hervé Lissek, Romain Christophe Rémy Fleury, Maxime Volery, Matthieu Francis Malléjac

Passive sound mitigation techniques have garnered attention whether for absorption, isolation, reverberation or new wave phenomena observation. In parallel, a wide range of research has been devoted to active control strategies, which complement passive te ...

Springer Science and Business Media LLC2025

Observation of amplitude-driven nonreciprocity for energy guiding

Hervé Lissek, Romain Christophe Rémy Fleury, Mathieu François Padlewski

The non-Hermitian skin effect is an intriguing physical phenomenon, in which all eigenmodes of a non-Hermitian lattice become localized at boundary regions. While such an exotic behavior has been demonstrated in various physical platforms, most realization ...

American Physical Society (APS)2025

Motion of a floating sphere pulled by a string and induced flows

Romain Christophe Rémy Fleury, Benjamin Apffel

We study in this article the motion of a floating ball attached to a soft string set in circular motion through its other end. Although simple, the system exhibits rich dynamics that we investigate experimentally and theoretically. At low rotation speeds, ...

2025

Nonlocal metamaterials and metasurfaces

Romain Christophe Rémy Fleury

The aim of rationally designed composites called metamaterials or metasurfaces is to achieve effective properties that go beyond those of their constituent parts. For periodic architectures, the design can draw on concepts from solid-state physics, such as ...

Springer Science and Business Media LLC2025

Loop Antenna for Wi-Fi 6/6E Application

Romain Christophe Rémy Fleury, Amir Jafargholi

This paper introduces a horizontally polarized, low-profile loop antenna. The antenna features a printed circular segmented loop loaded with capacitor varactors. By adjusting the capacitive varactors, the antenna has a broadband impedance bandwidth with a ...

Institute of Electrical and Electronics Engineers2025

The 2024 Acoustic Metamaterials Roadmap

Romain Christophe Rémy Fleury

Today, acoustic metamaterials form a core area of metamaterial research. They offer bespoke wave control, achievable through their rationally designed structure and are at the forefront of metamaterial applications and commercialisation. They find purpose ...

IOP Publishing2025

Floquet topological physics in photonics

Romain Christophe Rémy Fleury, Haoye Qin

Floquet topological physics, an area exploring periodically driven systems and leveraging degrees of freedom in the temporal dimension, has opened new avenues in photonics by enabling the creation of novel topological phases, new control mechanisms, and in ...

Optica Publishing Group2025

Practical realization of chiral nonlinearity for strong topological protection

Hervé Lissek, Romain Christophe Rémy Fleury, Mathieu François Padlewski, Xinxin Guo

Nonlinear topology has been much less inquired compared to its linear counterpart. Existing advances have focused on nonlinearities of limited magnitudes and fairly homogeneous types. As such, the realizations have rarely been concerned with the requiremen ...

Stichting SciPost2025

Topological hysteretic winding for temporal anti-lasing

Romain Christophe Rémy Fleury, Haoye Qin

Coherent perfect absorption (CPA), or anti-lasing, has been so far inherently restricted to continuous wave scenarios, drastically restricting its applications to standard linear steady-state systems. However, future technologies based on enhanced light-ma ...

Springer Science and Business Media LLC2025

Low-Profile Dual-Polarized SIW Slot Array Antenna for 5G Application

Romain Christophe Rémy Fleury, Amir Jafargholi

Decreasing the permittivity of a dielectric-loaded slotted waveguide antenna results in an increase in both impedance and radiation bandwidth, where the widest bandwidth can be achieved when the dielectric permittivity falls below unity. This concept is em ...

Institute of Electrical and Electronics Engineers2025

A Reconfigurable Pattern Loop Antenna for Wireless Applications

Romain Christophe Rémy Fleury, Amir Jafargholi

This letter presents a new low-profile, reconfigurable pattern antenna. The antenna features a printed circular segmented loop fed by two separate feed points coupled to a parasitic composite right/left-handed transmission line (CRLH TL). The key innovatio ...

Institute of Electrical and Electronics Engineers (IEEE)2025

Experimental realization of an active time-modulated airborne acoustic circulator at audible frequencies

Romain Christophe Rémy Fleury, Matthieu Francis Malléjac

Reciprocity is one of the fundamental characteristics of wave propagation in linear time-invariant media with preserved time-reversal symmetry. Breaking reciprocity opens the way to numerous applications in the fields of phononics and photonics, as it allo ...

Elsevier BV2025

A rendezvous with light

Romain Christophe Rémy Fleury

Topological localization of photons in both space and time has now been experimentally realized through synthetic photonic quantum walks, enabled by non-Hermitian gain–loss modulations. This investigation into time and space-time topology reveals unique ph ...

Nature Publishing Group2025

Science of a coffee cup: A physicist walks into a bar…

Romain Christophe Rémy Fleury, Benjamin Apffel

… and annoys everyone with unsolicited experiments. The present paper proposes a short pedagogical review of the various phenomena that can be observed in a coffee cup with little to no equipment. The physical domains spanned include acoustics, optics, and ...

2025

Anomalous‐Chern Steering of Topological Nonreciprocal Guided Waves

Romain Christophe Rémy Fleury, Haoye Qin, Qiaolu Chen, Zhechen Zhang

Nonreciprocal topological edge states based on external magnetic bias have been regarded as the last resort for genuine unidirectional wave transport, showing superior robustness over topological states with preserved time-reversal symmetry. However, fast ...

Wiley2024

SIW Slot Leaky-Wave Antenna Using Low-index Metamaterial

Romain Christophe Rémy Fleury, Amir Jafargholi

This paper presents a wideband leaky-wave substrate-integrated waveguide (SIW) slot antenna. The proposed structure comprises slots loaded with a low-index metamaterial (MTM). The MTM is realized using an array of thin wires. Loading the antenna with low-i ...

Institute of Electrical and Electronics Engineers Inc.2024

Ultrasound inspection training system

Romain Christophe Rémy Fleury, Janez Rus

An ultrasound inspection training system comprising a test object (1), an ultrasound producing device (3) configured to generate ultrasonic signals in the test object and read ultrasonic response signals emitted from the test object, a property altering de ...

2024

Optothermal shaping of lamb waves with square and spiral phase fronts

Romain Christophe Rémy Fleury, Aleksi Antoine Bossart, Janez Rus

We introduce a Lamb-wave medium with tunable propagation velocities, which are controlled by a two-dimensional heating pattern produced by a laser beam. We utilized it to demonstrate that waves in an appropriately designed medium can propagate in the form ...

2024