Spatial focusing of a time-reversed pulse

被引：1

作者：

Zverev, V.A. ^{[1
]}

机构：

[1] Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod

来源：

Radiophysics and Quantum Electronics | 2003年 / 46卷 / 07期

基金：

俄罗斯基础研究基金会;

关键词：

Focusing;

D O I：

10.1023/B:RAQE.0000019867.57582.20

中图分类号：

学科分类号：

摘要：

Focusing of a pulse with the focal-spot size λ/14, obtained experimentally by the method of time reversal of a wave is reported in [1], where it is treated as overcoming of the diffraction limit. This and other statements in [1] implying new physical concepts of time-reversed waves need detailed analysis. We consider the physical nature of the spatial focusing of a time-reversed pulse and show that the focal-spot narrowing below the diffraction limit results from observation of the field of a source located in the near zone of the observation point. This phenomenon cannot be treated as overcoming of the diffraction limit and is not related to the new physical concepts of waves. © 2003 Plenum Publishing Corporation.

引用

页码：517 / 522

页数：5