Articulo
The behaviour of evanescent waves under Lorentz transformations
Registro en:
issn:1827-613X
issn:0375-930X
Autor
Agudín, Jorge L.
Platzeck, Ana María
Albano, Jorge Raúl
Institución
Resumen
In this work we shall show that the transversal magnetic (TM) or transversal electric (TE) electromagnetic evanescent waves have not independent existence: under Lorentz transformations an original TM or TE mode is transformed in a mixture of TM and TE modes out of phase in 7:/2. Through the well-known TORALDO DI FRANCIA expansion of the field of an uniformly moving charge in evanescent waves, we axe able to give a physical reason for this result. An interesting feature of these transformations is that there exist two linear combinations of TM and TE modes (the left- and right-handed circularly polarized modes) which remain the same in all systems. These modes, which propagates with a mean velocity of energy transport equal to c, have an interesting property concerning their helicities which has been recently discussed in the literature. Observatorio Astronómico de La Plata