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Article Dans Une Revue Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Année : 2009

Quasimodes of a chaotic elastic cavity with increasing local losses

Résumé

We report non-invasive measurements of the complex field of elastic quasimodes of a silicon wafer with chaotic shape. The amplitude and phase spatial distribution of the flexural modes are directly obtained by Fourier transform of time measurements. We investigate the crossover from real mode to complex-valued quasimode, when absorption is progressively increased on one edge of the wafer. The complexness parameter, which characterizes the degree to which a resonance state is complex-valued, is measured for non-overlapping resonances and is found to be proportional to the non-homogeneous contribution to the line broadening of the resonance. A simple two-level model based on the effective Hamiltonian formalism supports our experimental results.
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Dates et versions

hal-00404705 , version 1 (16-07-2009)

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Olivier Xeridat, Charles Poli, Olivier Legrand, Fabrice Mortessagne, Patrick Sebbah. Quasimodes of a chaotic elastic cavity with increasing local losses. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2009, 80 (3), pp.035201(R). ⟨10.1103/PhysRevE.80.035201⟩. ⟨hal-00404705⟩
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