亚波长源的时域辐射和吸收
Time domain radiation and absorption by subwavelength sources
摘要：
基本源辐射是波动物理中的一个基本问题。我们表明，从电磁和声亚波长源辐射的时域能量通量具有显着的功能。特别是，一个微妙的权衡源发射和吸收的辐射机制的基础。任何类型的经典波都应该观察到这种行为，因此具有广泛的潜在意义。讨论了有源时间反转聚焦对亚波长聚焦的影响。
英文摘要：
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.
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