Volume 97, Number 3, February 2012
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||04 January 2012|
Time-domain radiation and absorption by subwavelength sources
Institut Langevin, ESPCI ParisTech, CNRS - 10 rue Vauquelin, 75231 Paris Cedex 05, France, EU
Accepted: 13 December 2011
Radiation by elementary sources is a basic problem in wave physics. We show that the time-domain energy flux radiated from electromagnetic and acoustic subwalength sources exhibits remarkable features. In particular, a subtle trade-off between source emission and absorption underlies the mechanism of radiation. This behavior should be observed for any kind of classical waves, thus having broad potential implications. We discuss the implication for subwavelength focusing by time reversal with active sources.
PACS: 42.25.-p – Wave optics / 43.20.+g – General linear acoustics / 41.20.Jb – Electromagnetic wave propagation; radiowave propagation
© EPLA, 2012
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