Figure 2b. However, at total internal reflection an evanescent field (red, range exaggerated in the figure) extends into the outer medium and can be absorbed there by a finger. This thus causes part of the totally reflected light to vanish and not reach the detector. In Figure 1 the prism was attached in optical contact with the window, but since all surfaces are rectangular, the same separation between the orthogonal ray systems was maintained, i e external light will not interfere with the operation

From

Apparent Superluminal Speeds in Evanescent Fields, Quantum Tunnelling and Quantum Entanglement

Arne Bergstrom

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