Kramers-Kronig relations and the barrier interaction time problem
Department of Physics, Yerevan State University, 375049, Yerevan, Armenia
2 Institut für Anorganische Chemie, Universität-GH Essen, Germany
3 Departamento de Física, Universidad de Murcia, Spain
Published online: 15 May 1999
It is shown that the two characteristic interaction times and for classical electromagnetic waves with an arbitrarily shaped barrier are not independent quantities, but are connected by Kramers-Kronig relations for the real and imaginary components of a causal magnitude. The corresponding macroscopic sum rule for the complex time is also derived. An analogy between the interaction time problem and an electrical circuit with capacitive and conducting frequency dependent components is established.
PACS: 41.20.Jb – Electromagnetic wave propagation; radiowave propagation / 42.25.-p – Wave optics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999