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30 Apr 2012

Volume 100, Issue 18, Articles (18xxxx)

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Appl. Phys. Lett. 100, 181901 (2012); http://dx.doi.org/10.1063/1.4705414 (4 pages)

Etienne Brasselet, Arnaud Royon, and Lionel Canioni
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Lifetime statistics of quantum chaos studied by a multiscale analysis

A. Di Falco, T. F. Krauss, and A. Fratalocchi

Appl. Phys. Lett. 100, 184101 (2012); http://dx.doi.org/10.1063/1.4711018 (4 pages) | Cited 1 time

Online Publication Date: 30 April 2012

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In a series of pump and probe experiments, we study the lifetime statistics of a quantum chaotic resonator when the number of open channels is greater than one. Our design embeds a stadium billiard into a two dimensional photonic crystal realized on a silicon-on-insulator substrate. We calculate resonances through a multiscale procedure that combines energy landscape analysis and wavelet transforms. Experimental data is found to follow the universal predictions arising from random matrix theory with an excellent level of agreement.
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05.45.Mt Quantum chaos; semiclassical methods
42.50.Lc Quantum fluctuations, quantum noise, and quantum jumps
03.65.Db Functional analytical methods
03.65.Fd Algebraic methods
03.65.Sq Semiclassical theories and applications

Interaction of laser generated ultrasonic waves with wedge-shaped samples

R. S. Edwards, B. Dutton, and A. R. Clough

Appl. Phys. Lett. 100, 184102 (2012); http://dx.doi.org/10.1063/1.4711021 (4 pages)

Online Publication Date: 4 May 2012

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Wedge-shaped samples can be used as a model of acoustic interactions with samples ranging from ocean wedges, to angled defects such as rolling contact fatigue, to thickness measurements of samples with non-parallel faces. We present work on laser generated ultrasonic waves on metal samples; one can measure the dominant Rayleigh-wave mode, but longitudinal and shear waves are also generated. We present calculations, models, and measurements giving the dependence of the arrival times and amplitudes of these modes on the wedge apex angle and the separation of generation and detection points, and hence give a measure of the wedge characteristics.
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62.65.+k Acoustical properties of solids
62.20.Qp Friction, tribology, and hardness
81.40.Pq Friction, lubrication, and wear
81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure
62.20.me Fatigue
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