Figure 2a. A rectangular glass prism has the property that a light ray from, e g, a LED to the left entering a side face of the prism can only exit through the opposite side face, where it is being detected (or through the same side face after reflections). No matter how many successive reflections may take place in a rectangular prism, the light ray will always experience total internal reflection in the other side faces. Similarly, external light will always be totally reflected in the side faces and cannot reach the detector. Using optical glass with a slightly higher refractive index, this separation between the ray systems can be maintained even in water (rain will not disturb the operation)

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

Arne Bergstrom

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