منابع مشابه
Time reversal of electromagnetic waves.
We report the first experimental demonstration of time-reversal focusing with electromagnetic waves. An antenna transmits a 1-micros electromagnetic pulse at a central frequency of 2.45 GHz in a high-Q cavity. Another antenna records the strongly reverberated signal. The time-reversed wave is built and transmitted back by the same antenna acting now as a time-reversal mirror. The wave is found ...
متن کاملExperimental Investigation of Time Reversal with Electromagnetic Waves in the Presence of Random Media
Wave propagation is a ubiquitous concept throughout physics. When the aim is to focus a wave at a given point in space or time, the resolution that can be achieved is usually limited by diffraction. However, time reversal is a method which takes advantage of multipath elements in a given channel and uses them to obtain resolution beyond the diffraction limit. This is known as super-resolution. ...
متن کاملTime-reversal generation of rogue waves.
The formation of extreme localizations in nonlinear dispersive media can be explained and described within the framework of nonlinear evolution equations, such as the nonlinear Schrödinger equation (NLS). Within the class of exact NLS breather solutions on a finite background, which describe the modulational instability of monochromatic wave trains, the hierarchy of rational solutions localized...
متن کاملTime and Intensity of Electromagnetic waves impacts on the Growth phase of Escherichia coli bacteria
Background: Electromagnetic fields have various effects on the biochemical and cellular behavior of microorganisms due to radiation. It is necessary to investigate more extensively the effects of these magnetic fields on some microorganisms, such as bacteria. The purpose of this study was tp investigate the effects of magnetic fields on Escherichia coli bacteria (PTCC 1330). Materials and Meth...
متن کاملTime Reversal for Waves in Random Media
In time reversal acoustics experiments, a signal is emitted from a localized source, recorded at an array of receivers-transducers, time reversed, and finally re-emitted into the medium. A celebrated feature of time reversal experiments is that the refocusing of the re-emitted signals at the location of the initial source is improved when the medium is heterogeneous. Contrary to intuition, mult...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2004
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.92.193904