Producing acoustic ‘Frozen Waves’: Simulated experiments with diffraction/attenuation resistant beams in lossy media |
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Authors: | José L Prego-Borges Michel Zamboni-Rached Erasmo Recami Eduardo Tavares Costa |
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Institution: | 1. Faculty of Electrical and Computer Engineering, State University of Campinas, Campinas, SP, Brazil;2. INFN-Sezione di Milano, Milan, Italy;3. Faculty of Engineering, Bergamo State University, Bergamo, Italy |
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Abstract: | The so-called Localized Waves (LW), and the “Frozen Waves” (FW), have raised significant attention in the areas of Optics and Ultrasound, because of their surprising energy localization properties. The LWs resist the effects of diffraction for large distances, and possess an interesting self-reconstruction —self-healing— property (after obstacles with size smaller than the antenna’s ); while the FWs, a sub-class of LWs, offer the possibility of arbitrarily modeling the longitudinal field intensity pattern inside a prefixed interval, for instance 0?z?L, of the wave propagation axis. More specifically, the FWs are localized fields “at rest”, that is, with a static envelope (within which only the carrier wave propagates), and can be endowed moreover with a high transverse localization. |
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Keywords: | &ldquo Frozen Waves&rdquo Diffraction Attenuation Bessel beam superpositions Annular transducers |
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