Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-03-09
EPL 89, 60002 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 2 figures
Scientific paper
The time-reversal mirror (TRM) prescribes the reverse playback of a signal to focalize an acoustic excitation as a Loschmidt echo. In the quantum domain, the perfect inverse filter (PIF) processes this signal to ensure an exact reversion provided that the excitation originated outside the cavity delimited by the transducers. We show that PIF takes a simple form when the initial excitation is created inside this cavity. This also applies to the acoustical case, where it corrects the TRM and improves the design of an acoustic bazooka. We solve an open chaotic cavity modeling a quantum bazooka and a simple model for a Helmholtz resonator, showing that the PIF becomes decisive to compensate the group velocities involved in a highly localized excitation and to achieve subwavelength resolution.
Calvo Hernán L.
Pastawski Horacio Miguel
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