J. Phys. I France 4 (1994) 1379-1382
Tunneling with dissipationG. Nimtz, H. Spieker and H.M. Brodowsky
II.Physikalisches Institut, Universität zu Köln, D-50937 Köln, Germany
(Received 30 June 1994, received in final form 2 July 1994, accepted 8 July 1994)
Dissipative tunneling was studied with electromagnetic waves. Experiments were carried out with undersized waveguides loaded with a lossy dielectric medium which corresponds to a complex potential barrier. With increasing dissipation the Hartman effect disappears, i.e., the traversal time becomes dependent on barrier length. The results are in agreement with a recent phase time approach on complex tunneling.
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