Unipolar components travelling at the speed of light in vacuo

preprint2012arXivOpen access

Abstract

We describe a physical situation where the time integral of the electric field of an electromagnetic wave packet is not zero. More specifically, the non-oscillating component of the Fourier spectrum, i.e. the component resulting from the Fourier transform of the electric field evaluated at ω=0ω=0, can be associated with the area under a locally unipolar electromagnetic pulse that travels in free space at the speed of light.

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