Reexamination of energy flow velocities of non-diffracting localized waves
arXiv:1904.08122 · doi:10.1103/PhysRevA.100.013849
Abstract
A universal relation has been established between the local energy transport velocity along the direction of propagation and the group velocity of scalar and vector-valued propagation-invariant spatiotemporally localized superluminal and subluminal electromagnetic waves in free space. Under specific restrictions, this relationship is very closely valid for physically realizable almost propagation-invariant spatiotemporally confined subluminal and superluminal electromagnetic fields. In both cases, although the group velocity may be either superluminal or subluminal, the universal relation is in accord with the well-established result that the upper limit of the energy transport velocity is c, the speed of light in vacuum.
11 pages, 4 figures
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- Energy backflow in unidirectional spatiotemporally localized wavepackets
- Backward energy flow in simple 4-wave electromagnetic fields
- Reactive energy in non-diffracting localized waves
- Couplings between the temporal and orbital angular momentum degrees of freedom in ultrafast vortices with propagation-invariant temporal shape
- Axial spectral encoding of space-time wave packets
- Refraction of space-time wave packets: I. Theoretical principles
- Study of energy backflow in unidirectional monochromatic and space-time waves
- Spectrally recycling space-time wave packets