Figure 1. OptiSensor’s optical touch key operating a toy train at Stor och Liten toyshop in Stockholm at Christmas time in the early 1980s. The black box is temporarily glued in optical contact to the inside of the window and sends infrared light beams that experience total internal reflection in the outer window surface, but where the evanescent field immediately outside the window surface can be dampened by touching the window with a finger and thus control the train. The finger tip of the child interacts with the evanescent field outside the glass with superluminal group velocity as explained in Sec. 3

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

Arne Bergstrom

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