Energy-flow velocities of nondiffracting localized waves
| Autor: | Ioannis M. Besieris, Peeter Saari, Ott Rebane |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Electromagnetic field
Physics Physics::General Physics Superluminal motion Scalar (physics) Physics::Classical Physics 01 natural sciences Electromagnetic radiation Universal relation 010305 fluids & plasmas Quantum electrodynamics Energy flow 0103 physical sciences Group velocity Speed of light 010306 general physics |
| Zdroj: | Physical Review A. 100 |
| ISSN: | 2469-9934 2469-9926 |
| DOI: | 10.1103/physreva.100.013849 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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