Subwavelength ultrasonic circulator based on spatiotemporal modulation

Fleury, Romain; Sounas, Dimitrios L.; Alù, Andrea

doi:10.1103/physrevb.91.174306

Cited by 125 publications

(64 citation statements)

References 14 publications

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“…As a proper (non-locally) reacting liner, there is no bias field without external excitation. This last feature is very important, as it differentiates our method from flow-biased devices [16], and makes it a good candidate for achieving non-reciprocal acoustic propagation in waveguides which must be travelled by air (as in ventilation systems, intakes and so on), or by any other noise-producing medium. The experimental implementation of such a biased boundary has been realized through a loudspeaker control, similarly to the active Acoustic Metamaterial in [22].…”

Section: Discussionmentioning

confidence: 99%

Broadband Nonreciprocal Acoustic Propagation Using Programmable Boundary Conditions: From Analytical Modeling to Experimental Implementation

et al. 2019

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In this paper, we theoretically, numerically and experimentally demonstrate the acoustic isolator effect in a 1D waveguide with direction dependent controlled boundary conditions. A theoretical model is used to explain the principle of non reciprocal propagation in boundary controlled waveguides. Numerical simulations are carried out on a reduced model to show the non-reciprocity as well as the passivity of the system, through the computation of the scattering matrix and the power delivered by the system. Finally, an experimental implementation validate the potential of programmable boundary conditions for non reciprocal propagation.

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Section: Discussionmentioning

confidence: 99%

Broadband Nonreciprocal Acoustic Propagation Using Programmable Boundary Conditions: From Analytical Modeling to Experimental Implementation

et al. 2019

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“…Nevertheless, the physics of light, sound, and mechanical wave propagation is fundamentally different than the one of electrons, and finding classical analogs to electronic topological insulators imply solving a certain number of challenges. Chern topological insulators [1-3, 11-14, 16, 43, 44, 47, 48, 50, 51, 53, 55], on one hand, require violating time-reversal (TR) symmetry, which implies to largely break reciprocity of wave propagation [59], a difficult task in linear photonic [60] or acoustic [61][62][63][64] systems. In addition, this usually involves the use of a time-odd external bias, such as a magnetic field, often leading to designs that require some form of external energy input, and an arguably challenging implementation.…”

Section: Introductionmentioning

confidence: 99%

Topological acoustic polaritons: robust sound manipulation at the subwavelength scale

et al. 2017

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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 propagation along their edges, a property that could lead to a wealth of new opportunities in the ability to guide and manipulate sound. Here, we demonstrate and study the possibility to induce topologically non-trivial acoustic states at the deep subwavelength scale, in a structured two-dimensional metamaterial composed of Helmholtz resonators. Radically different from previous designs based on non-resonant sonic crystals, our proposal enables robust sound manipulation on a surface along predefined, subwavelength pathways of arbitrary shapes.

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“…Due to the dynamic instability, the transmission loss and the inherent noise, it is still a grave challenge for the practical implementation of the moving background. Recently, the topological orders of sound in acoustic networks have also been induced by the spatiotemporal modulation (53,54) and the resonant coupling (55)(56)(57). Such topological states can be contributed to the inherent spin-1/2 fermionic character.…”

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confidence: 99%

Observation of valleylike edge states of sound at a momentum away from the high-symmetry points

et al. 2018

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Topologically protected one-way transportation of sound, mimicking the topological properties of the condensed matter, has received greatly attentions. Thus far, the topological phases and the topological edge states of sound are yielded in the vicinity of the Dirac cones fixed at the high symmetric points of the Brillouin zone. Here, we present a new type of the phononic topological insulator in the square lattice with position-variational Dirac cones along the high symmetric lines. The emergence of such Dirac cones, characterized by the vortex structure in a momentum space, is attributed to the unavoidable band crossing protected by the mirror symmetry. By rotating the square columns, these Dirac points are lifted and a complete band gap is induced because of the mirror-symmetry-breaking. Along the topological domain wall between the phononic crystals (PhCs) with the distinct topological phases stemming from the mirror symmetry inversion, we obtain a topological edge state for the neutral scalar sound which is absence of the intrinsic polarization and is uncoupled from an external field. Within a wide rotational range of the square column, the topological edge state in our PhCs evolves from xiabz2013@hnu.edu.cn (Baizhan Xia) djyu@hnu.edu.cn (Dejie Yu)

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Subwavelength ultrasonic circulator based on spatiotemporal modulation

Abstract: Enabling efficient non-reciprocal acoustic devices is challenging

Cited by 125 publications

References 14 publications

Broadband Nonreciprocal Acoustic Propagation Using Programmable Boundary Conditions: From Analytical Modeling to Experimental Implementation

Broadband Nonreciprocal Acoustic Propagation Using Programmable Boundary Conditions: From Analytical Modeling to Experimental Implementation

Topological acoustic polaritons: robust sound manipulation at the subwavelength scale

Observation of valleylike edge states of sound at a momentum away from the high-symmetry points

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