Cloaking strategy for Love waves

Chatzopoulos, Z.; Palermo, Antonio; Guenneau, Sébastien; Marzani, Alessandro

doi:10.1016/j.eml.2021.101564

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…Figure 9 compares the dispersion diagrams of the twinned cavities: both real and imaginary parts of the frequency show a very good agreement, indicating the ability to twin all the dispersion properties for these periodic structures. We note that a similar approach was implemented in [43] to quantify the cloaking efficiency of carpet cloaks. However, dispersion diagrams were an aside in a study addressing scattering problems.…”

Section: Flattening a Blazed Gratingmentioning

confidence: 99%

Isospectral open cavities and gratings

Cominelli,

Vial,

Guenneau

et al. 2024

Proc. R. Soc. A.

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Open cavities are often an essential component in the design of ultra-thin subwavelength metasurfaces and a typical requirement is that cavities have precise, often low frequency, resonances while simultaneously being physically compact. To aid this design challenge, we develop a methodology to allow isospectral twinning of reference cavities with either smaller or larger ones, enforcing their spectra to coincide so that open resonators are identical in terms of their complex eigenfrequencies. For open systems, the spectrum is not purely discrete and real, and we pay special attention to the accurate twinning of leaky modes associated with complex-valued eigenfrequencies with an imaginary part orders of magnitude lower than the real part. We further consider twinning of two-dimensional gratings, and model these with Floquet–Bloch conditions along one direction and perfectly matched layers in the other one; complex eigenfrequencies of special interest are located in the vicinity of the positive real line and further depend upon the Bloch wavenumber. The isospectral behaviour is illustrated, and quantified, throughout by numerical simulation using finite-element analysis.

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Section: Flattening a Blazed Gratingmentioning

confidence: 99%

Isospectral open cavities and gratings

Cominelli,

Vial,

Guenneau

et al. 2024

Proc. R. Soc. A.

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“…Moreover, Liu et al [348] experimentally demonstrated source illusion devices for flexural wave manipulation. Although not explicitly mentioned here, there is other notable research progress on the relevant topic [349][350][351][352][353][354][355][356][357][358].…”

Section: Othersmentioning

confidence: 99%

Elastic metamaterials for guided waves: from fundamentals to applications

Lee,

Kim

2023

Smart Mater. Struct.

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Guided waves, elastic waves propagating through bounded structures, play a pivotal role in various applications, including ultrasonic non-destructive testing and structural health monitoring. Recently, elastic metamaterials artificially engineered to exhibit physical properties not typically seen in nature have emerged as a ground-breaking approach, heralding a new era in guided wave-based technologies. These metamaterials offer innovative solutions to overcome the inherent constraints of traditional guided wave-based technology. This paper comprehensively reviews elastic metamaterials from their fundamental principles to diverse applications, focusing on their transformative impact in guided wave manipulation.

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“…In the context of elastodynamics, materials dressed with space, time, and space-time modulations are conveniently molded to manipulate wave motion at will. Examples have shown different forms of waveguiding that rely on defect mechanisms [1], topological insulators [2][3][4][5][6][7][8][9][10][11][12], metagradings [13][14][15][16][17][18][19][20][21], transformation optics and acoustics [22][23][24][25][26][27][28][29][30][31][32], which are passive strategies effectively employed to accomplish relevant technological behaviors, such as communication, focusing, and invisibility.…”

Section: Introductionmentioning

confidence: 99%

Elastic temporal waveguiding

Santini

Riva²

2023

New J. Phys.

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We provide a theoretical framework to mold time-modulated mechanical metamaterials with frequency conversion and wave-steering capabilities. To illustrate the concept, we initially focus on 1D lattices, whereby a sufficiently slow time-modulation of the stiffness is employed to convert the frequency content of impinging waves. Based on the adiabatic theorem, we demonstrate that undesired reflections, which emerge in time-discontinuous materials, can be dramatically reduced by a careful choice of the modulation velocity. The concept is later explored in the context of 2D lattices, whereby a slow time modulation of the stiffness not only induces frequency conversion with minimal back-scattering, but also serves as a mechanism to steer waves. Our paper explores a new and exciting way to control wave propagation in elastodynamics with scattering-free guiding capabilities, and may open new avenues for the manipulation and transport of information through elastic waves.

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Cloaking strategy for Love waves

Cited by 8 publications

References 38 publications

Isospectral open cavities and gratings

Isospectral open cavities and gratings

Elastic metamaterials for guided waves: from fundamentals to applications

Elastic temporal waveguiding

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