A Sub-femtosecond Stop Watch for ‘Photon Finish’ Races (IMAGE)

National Institute of Standards and Technology (NIST)

A Sub-femtosecond Stop Watch for ‘Photon Finish’ Races

Caption

Diagram of two stack configurations with odd numbers of layers. Blue layers have a high index of refraction, white layers a low. The stacks are nearly identical with the exception of where the extra layer is deposited.

Credit

NIST

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