Probing Semiconductors with Femtosecond Pulses

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Abstract
In semiconductor microelectronics, small distances and high speeds are closely related. Transistors with base lengths of only a few tens of nanometers have electron transit times that can be less than 1 picosecond. Indeed, this very fact has motivated much of the intense interest in very‐small‐scale electronic devices: To make something faster, one generally must make it smaller.