Acoustic Guided Waves in MoS2 thin flakes
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arXiv
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| Format: | Preprint |
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2026
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| author | Aversa, Martín Roqueiro, Nicolás Borrazás, Camila Sangiorgio, Juan Ignacio Boggiano, Hilario D. Bonaparte, Juan Di Donato, Andrés Fuertes, María Cecilia Bragas, Andrea V. Grinblat, Gustavo |
| author_facet | Aversa, Martín Roqueiro, Nicolás Borrazás, Camila Sangiorgio, Juan Ignacio Boggiano, Hilario D. Bonaparte, Juan Di Donato, Andrés Fuertes, María Cecilia Bragas, Andrea V. Grinblat, Gustavo |
| contents | Guided acoustic waves in two-dimensional materials are a key channel for energy transport and dissipation, yet their generation and propagation in transition metal dichalcogenides remain poorly understood. Here, we employ in-situ and spatially decoupled ultra-fast optical pump-probe techniques to investigate guided waves in MoS2 flakes with thicknesses between 90 and 410 nm. We observe a propagating acoustic excitation with a constant velocity of (6.7 +/- 0.8) km/s, independent of thickness. Finite element simulations and symmetry analysis reveal that these vibrations deviate from the classical Lamb wave model and are better described as a superposition of decoupled longitudinal and shear modes. We show that their optical detectability is governed by the Poisson effect: longitudinal components modulate the flake thickness and generate a measurable signal, whereas shear motion remains largely optically invisible. An intrinsic attenuation length of approximately 3.3 microns indicates that dissipation is dominated by material-specific mechanisms rather than geometric spreading. Finally, we demonstrate remote excitation across a nanometric step, enabling acoustic generation in optically inaccessible regions. These results provide a foundation for nanoscale phononic circuits and engineered in-plane energy transport in 2D-based optomechanical and quantum acoustic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_21156 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Acoustic Guided Waves in MoS2 thin flakes Aversa, Martín Roqueiro, Nicolás Borrazás, Camila Sangiorgio, Juan Ignacio Boggiano, Hilario D. Bonaparte, Juan Di Donato, Andrés Fuertes, María Cecilia Bragas, Andrea V. Grinblat, Gustavo Optics Guided acoustic waves in two-dimensional materials are a key channel for energy transport and dissipation, yet their generation and propagation in transition metal dichalcogenides remain poorly understood. Here, we employ in-situ and spatially decoupled ultra-fast optical pump-probe techniques to investigate guided waves in MoS2 flakes with thicknesses between 90 and 410 nm. We observe a propagating acoustic excitation with a constant velocity of (6.7 +/- 0.8) km/s, independent of thickness. Finite element simulations and symmetry analysis reveal that these vibrations deviate from the classical Lamb wave model and are better described as a superposition of decoupled longitudinal and shear modes. We show that their optical detectability is governed by the Poisson effect: longitudinal components modulate the flake thickness and generate a measurable signal, whereas shear motion remains largely optically invisible. An intrinsic attenuation length of approximately 3.3 microns indicates that dissipation is dominated by material-specific mechanisms rather than geometric spreading. Finally, we demonstrate remote excitation across a nanometric step, enabling acoustic generation in optically inaccessible regions. These results provide a foundation for nanoscale phononic circuits and engineered in-plane energy transport in 2D-based optomechanical and quantum acoustic devices. |
| title | Acoustic Guided Waves in MoS2 thin flakes |
| topic | Optics |
| url | https://arxiv.org/abs/2602.21156 |