J. Phys. I France 4 (1994) 565-570
Photonic tunneling timesG. Nimtz, A. Enders and H. Spieker
II.Physikalisches Institut, Universit5,t zu K51n, Zülpicher Str. 77, D-50937 KSln, Germany
(Received 9 December 1993, accepted 17 December 1993)
We report on resonant and non-resonant photonic tunneling experiments. Resonant tunneling of wave packets has revealed a light localization, whereas the non-resonant barrier tunneling has corresponded to a zero-time barrier crossing. For a frequency-limited signal the non-resonant tunneling transmission time yielded superluminal group velocities, whereas in the case of a resonant transition the velocities are much slower than c.
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