具有超光旋转分布图的极化电流产生的电磁辐射聚焦宽带脉冲的频谱
The frequency spectrum of focused broadband pulses of electromagnetic radiation generated by polarization currents with superluminally rotating distribution patterns
摘要：
研究了超光速极化电流辐射的光谱特征，该电流的分布模式以角频率$ω$旋转，以非公度频率$Ω>ω$振荡.这种类型的极化电流是在最近设计的研究超光速发射的实际机器中发现的。虽然所有涉及的过程是线性的，我们发现，宽带发射包含的频率高于$Ω$的一个因素的顺序为$(Ω/ω)^2$。这种频率的产生{ \it not}是产生源所必需的，这是由于我们熟悉的延迟势的经典表达式在数学上的严格结果。结果表明超光速极化电流的宽带射频和红外光源的实际应用。
英文摘要：
We investigate the spectral features of the emission from a superluminal polarization current whose distribution pattern rotates with an angular frequency $ω$ and oscillates with an incommensurate frequency $Ω>ω$. This type of polarization current is found in recent practical machines designed to investigate superluminal emission. Although all of the processes involved are linear, we find that the broadband emission contains frequencies that are higher than $Ω$ by a factor of the order of $(Ω/ω)^2$. This generation of frequencies {\it not} required for the creation of the source stems from mathematically rigorous consequences of the familiar classical expression for the retarded potential. The results suggest practical applications for superluminal polarization currents as broad-band radiofrequency and infrared sources.
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