On a universal photonic tunnelling time

Details On a universal photonic tunnelling time On a universal photonic tunnelling time

2001-02-08

arxiv.org/abs/physics/0102020v2

Phys.Rev.E64:026609,2001

Physics

Optics

RevTeX, 8 pages, 4 figures, 1 table; subsection added with a new experiment analyzed, some other minor changes

Scientific paper

10.1103/PhysRevE.64.026609

We consider photonic tunnelling through evanescent regions and obtain general analytic expressions for the transit (phase) time $\tau$ (in the opaque barrier limit) in order to study the recently proposed ``universality'' property according to which $\tau$ is given by the reciprocal of the photon frequency. We consider different physical phenomena (corresponding to performed experiments) and show that such a property is only an approximation. In particular we find that the ``correction'' factor is a constant term for total internal reflection and quarter-wave photonic bandgap, while it is frequency-dependent in the case of undersized waveguide and distributed Bragg reflector. The comparison of our predictions with the experimental results shows quite a good agreement with observations and reveals the range of applicability of the approximated ``universality'' property.

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