A three-dimensional depiction of the spatial variation of the optical electromagnetic field around a microantenna following excitation with terahertz pulse. The optical field is mapped with the aid of electron pulses. Credit: Illustration by Peter Baum
Temporally varying electromagnetic fields are the driving force behind the whole of electronics. Their polarities can change at mind-bogglingly fast rates, and it is difficult to capture them in action. However, a better understanding of the dynamics of field variation in electronic components, such as transistors, is indispensable for future advances in electronics...
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