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arXiv 1003.1941cond-mat.mes-hallquant-ph
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开放腔中声学和量子激发的精确时间反演聚焦:完美的逆滤波器

Exact time-reversal focusing of acoustic and quantum excitations in open cavities: The perfect inverse filter

Hernan L. Calvo, Horacio M. Pastawski

摘要:

时间反转镜(TRM)规定了信号的反向回放,以将声激励聚焦为Loschirm回波。在量子域中,完美逆滤波器(PIF)处理该信号以确保精确的反转,前提是激发起源于由换能器限定的腔体外部。我们表明,PIF采取一个简单的形式时,初始激发是在这个腔。这也适用于声学的情况下,它纠正了TRM和改进设计的声学火箭筒。我们解决了一个开放的混沌腔建模的量子火箭筒和亥姆霍兹谐振器的一个简单的模型,表明PIF成为决定性的补偿参与高度本地化的激发和实现亚波长分辨率的群速度。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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