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| Attosecond observation of changes in the electronic properties of a dielectric induced by the oscillating field of light. A nanometric thin silica-glass film (black frame in the centre of picture) is exposed to intense few-femto-second light pulses (red). The strong field of the light pulse changes the electronic states in the glass, with each cycle of its oscillation. These variations are tracked in real time by a series of "snapshots" recorded by attosecond light pulses (blue) passed through the sample at different instants delayed with respect to the intense excitation pulse.Credit: Thorsten Naeser, LMU. |
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