Quasimodes of a chaotic elastic cavity with increasing local losses

Details Quasimodes of a chaotic elastic cavity with increasing local losses Quasimodes of a chaotic elastic cavity with increasing local losses

2009-07-16

arxiv.org/abs/0907.2894v1

Physical Review E 80, 3 (2009) 035201(R)

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevE.80.035201

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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