Time-reversal of a wave packet emitted by an internal source: the perfect inverse filter
| dc.creator | Calvo, Hernan L. | |
| dc.creator | Pastawski, Horacio M. | |
| dc.date | 2008-04-15 | |
| dc.date.accessioned | 2026-07-07T09:32:42Z | |
| dc.date.available | 2026-07-07T09:32:42Z | |
| dc.description | The time-reversal mirror (TRM) of acoustic waves is used as a focusing technique that is robust against disorder and chaos. The propagation of an ultrasonic pulse from the focal point is detected and recorded by a surrounding array of transducers that enclose the cavity region. The registered signals are then played-back in the reverse temporal sequence and an imperfect Loschmidt echo is obtained. A similar technique developed in the quantum domain, the perfect inverse filter (PIF), ensures an exact reversion. Applied to the acoustical case, it allows an improvement in the design of a minimally invasive inverse filter. Although that version of PIF accounts for external source condition, now we propose a generalization where the initial excitation is created inside the cavity. We present the theoretical principles for this form of PIF and perform a numerical test in a multichannel system that improves the focalization quality compared to the TRM version. | |
| dc.description | 16 pages, 4 figures | |
| dc.identifier | https://arxiv.org/abs/0804.2355 | |
| dc.identifier | http://arxiv.org/abs/0804.2355 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/158871 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Time-reversal of a wave packet emitted by an internal source: the perfect inverse filter | |
| dc.type | text |