Do Evanescent Modes Violate Relativistic Causality?
نویسنده
چکیده
Time dependent experiments with evanescent modes (photonic tunneling) can be performed with high precision and at a macroscopic scale with microwaves in the range of meters or in the infrared regime in the range of centimeters. The infrared technology is the present day digital signal processing and transmission. Superluminal (faster than light) signal transmission by evanescent modes was shown by Enders and Nimtz already 1992 [1]. Evanescent modes are solutions of the Helmholtz equation with imaginary wave vectors which are equivalent to the tunneling solutions of the Schrödinger equation. Experiments of transmission and of partial reflection of microwaves by photonic potential barriers revealed superluminal signal velocity of evanescent modes. The effect is a near field phenomenon and violates the relativistic causality. In this contribution superluminal experiments are introduced and explained.
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